Abstract:The field simulated experiment study was conducted to explore the effect of vegetation types on hillslope runoff,erosion,sediment yield and infiltration,as well as the interrelation among these elements.The mechanism and variance of vegetation types regulating on the runoff and sediment process was clarified.The results showed that the runoff and sediment yield processes in barren land,grass land and slope farmland showed fluctuated trend than forest land,present the characteristic of multi-peak multi-valle...

Abstract:Rill erosion is one of the most important soil erosion processes on loess slope.It is of great significance to reveal the mechanism of soil erosion and sediment yield processes and control soil loss on hill slope by studying the variation processes of flow sediment concentration of rill.The simulation experiment on using combinatorial flume under rainfall condition indoors were done to investigate the changing process of flowing sediment concentration of rill on Loess Plateau slope.Results showed that:(1) C...

Abstract:This study separated the effects of climate change and soil and water conservation on reservoir inflow in the Fenhe reservoir using runoff and precipitation data during 1956-2004 by building double mass curve model based on using statistical methods.Contribution of soil and water conservation and climate change to runoff variation were analyzed based on defining the conception of contribution rate.The results showed that reservoir inflow and precipitation tended to become lower for the period,but reservoir ...

Abstract:植被根系的力学性质对于斜坡的稳定性是一个重要因素。为确定油松根系的基本力学特性,对油松不同标距不同直径根段进行拉力试验。结果表明:所有根系随直径级的增大,抗拉力以幂函数显著增大,抗拉强度却以幂函数减小,对于直径D≤1mm的根系,抗拉强度显著增加。标距对抗拉力影响不显著,对抗拉强度影响显著。油松的应力应变曲线为单峰曲线,具有弹塑性材料特征。首次初步将油松根系的应力应变曲线简化为3个阶段:线性弹性段、非线性弹性段和塑性段。在理论推导和数据分析的基础上,建立了油松根系的三阶抛物线本构模型。这些研究探明了油松作为水土保持先锋树种固土的力学机理,对护坡植物的选择和优化组合具有重要的参考价值。

Abstract:As a demonstration from the two rivers of the Ebinur lake basin,the paper checked the periodic characteristics and change trend of annual runoff processes and annual precipitation from 1961 to 2008 by using the Mann-Kendall test,line analyze and the wavelet analysis method.The main conclusions were as follows:(1)The trend of precipitation was increasing in Boertala river and Jinghe river of Ebinur lake basin during the 48 years.The average trends of Boertala station was 8.54 mm/10 a and the average trends o...

Abstract:The sand barrier is one of methods to break wind and control sand,because the environment is harsh in arid area with less water resource.The plastic checkerboard sand-barrier was set on the leeward of crescentic dune,and some index,such as wind velocity,transported quantity of sand,shape of surface of sand-land,depth of erosion and breakage ratio of sand barrier were observed.The results showed that:The wind velocity was decreased when the plastic checkerboard sand-barrier was set on the leeward of crescent...

Abstract:Soil erosion is a long time malignant geomorphologic processes,has become the most important and largest continuous influence of the eco-environmental problems in China.This article took the main of Chongqing city as an example,which was located at the end of the Three Gorges Reservoir.The synthesis utilizes RS and the GIS technology,interpreting the 1988,1999,2009 three periods of TM,CBERS remote sensing,and with the digital geological map of the spatial overlay.The results showed in the following aspects:...

Abstract:In order to make people have more intuitively understanding for the importance of forest ecology and economic status,provide a scientific basis for integrated decision-making of ecological and economic development,and achieve the sustainable development of ecological economic.Taking major forest areas as the research objects in Gansu province,soil conservation and economic value of forest ecosystem were evaluated quantitatively with the method of combining PAM and VAM.The results showed that:(1) In Gansu pr...

Abstract:Nitrogen and phosphorus loss through surface runoff from paddy fields around Chaohu lake plus water quality in related drainage ditches and rice yields of these fields were studied in order to find practical management measures which will reduce non-point source pollution from agricultural fields and at the same time keep good crop yields.Three different fertilizations were considered in the demonstration fields: Reduction fertilizer(RF),optimization fertilizer(OF) and conventional fertilizer(CF).The result...

Abstract:The objective of this experiment was to investigate the effects of tillage on soil water consumption and NO-3-N leaching at each growth stage of wheat.The experiment was conducted using the high-yielding winter wheat cultivar of Jimai 22,and five tillage styles were designed which were strip rotary tillage(SR),strip rotary tillage after subsoiling(SRS),rotary tillage(R),rotary tillage after subsoiling(RS) and plowing tillage(P).The results showed that:(1)The evaporation at each growth stage of wheat,soil wa...

Abstract:Research on soil water and salt migration within different soil layers and annual variation of soil salinity under border irrigation with saline water before sowing in the Bohai rim,to provide theoretical basis and technical parameters for confirming reasonable irrigation indexes.The results showed that the soil profile water and salt distribution presented significant difference under different soil water content,the layers of 0-60 cm and 0-40 cm was the inconstant layer of soil water and salt respectively...

Abstract:Forest ecosystem,especially forest soil,was disturbed increasingly by Human's management practices,such as fertilization,soil treatment and so on.Soil disturbance of riparian forest will increase the risk of nutrient loss causing eutrophication of river and lakes downstream and affect the role of forest as the riparian buffer zone.This study selected 34 typical plots of bamboo forest,economic forest,pure forest and mix forest within 1 km of the Xitiaoxi river in Taihu basin.Soil samples in different layers ...

Abstract:By means of typical spot samples,78 soil spots were chosen in Yingwugou watershed.The contents of soil nutrient were determined for each soil sample of 4 different soil depths.Both traditional and geostatistics methods were applied to analyze TN in 4 different soil depths.The results indicated that TN contents(mean,maximum,minimum) were all A1>A2>A3>A4.With the increasing of depths,the TN content reduced.The Kriging interpolation shown that the TN from A1 to A4 changed from small patches to large patches an...

Abstract:The spatial distribution and availability of soil potassium in loess plateau after 24 years of long-term fertilization were investigated in this study.The result showed that the quantity of potassium,except the nonspecifically absorbed K with the chemical fertilizer application,in the 0-20 cm soil layer was larger than that in 20-40 cm soil layer in all treatments and the quantity of potassium gradually decreased with depth below in the 60 cm soil layer.The quantities of K in 0-300 cm soil layer in the trea...

Abstract:Soil physicochemical properties of Huoditang in different altitudes were researched for exploring the relationship between altitude and soil physicochemical properties.Stratified to get soil sample,the content of soil organic matter,total nitrogen,available nitrogen,total phosphorus,available phosphorus,total potassium,available potassium and pH were determined.The results showed that:(1) With the increase of section depth of soil samples in the different altitudes,pH appeared gradually increase,but the con...

Abstract:Adopt short-term indoor reclaimed water irrigation in the soil column simulation and long-term field investigation,identify positioning,for reclaimed water irrigation to plant nutrients mischief ion and heavy metal element,and decrease of change were compared and analyzed.Results showed that,with clear-water contrast,reclaimed water irrigation made greenland soil pH lower,soil organic matter content increased,porosity increased,density and field capacity decreased;Total nitrogens,total phosphorus content wi...

Abstract:The experiment was designed to study the effects of continuous returning straw to maize filed on 0-40 cm soil nutrient and microbe,0-20 cm soil microbial biomass in 3-year returning(2007-2010),6-year returning(2005-2010),9-year returning(2002-2010),and non returning field at Pingliang maize breeding experimental station of Gansu agricultural university from 2002 to 2010.The tilth physical and chemical property and variation of main soil microorganism were tested to probe the effectiveness of continuous stra...

Abstract:This experiment aimed at researching on the microbial ecology of microbial agent mixed with slow-release fertilizer by using the method that plate count method and BIOLOG microplate technique.The experiment adopted the method of cultivating potted plants in a greenhouse by reclaimed soil.Appling microbial agent mixed with slow-release fertilizer could increase qualities of bacteria,fungus and actinomycosis remarkably.In addition,appling microbial agent mixed with slow-release fertilizer could enhance the ac...

Abstract:In order to seek for the ways of emission of sewage sludge by economic and environmental methods,promote the harmless and resource utilization of sludge,filter out high quality organic fertilizer formula and consistent with industry standards NY 525-2002.Selecting suitable conditioner according to feature of sludge and local condition,the dynamic change of physicochemical properties and microbiological characteristics during the composting process were studied.The results showed that all treatment reached m...

Abstract:土壤微生物是土壤的重要组成部分,对土壤肥力的形成和植物营养的转化起着积极的作用,是土壤肥力和环境变化的重要指标。通过土壤微生物量测定,研究新银合欢植物篱对紫色土区坡地农耕地、经济林地2种土地利用方式及10°,15°坡度下0-20cm土层土壤微生物特性的影响。研究发现:新银合欢植物篱可以明显提高土壤中细菌、放线菌、真菌的数量及微生物量碳、氮含量;植物篱对经济林地小区土壤微生物数量,微生物量碳、氮的影响作用总体上大于对农耕地小区的,同时对10°农耕地的影响作用总体上大于对15°农耕地的;下坡的三大微生物数量,土壤微生物量碳,氮平均含量明显比上坡的多,下坡距离植物篱带最近采样点处三大微生物数量,土壤微生物量碳,氮含量明显比其他采样点的多。表明定植新银合欢植物篱有利于减少土壤肥力衰退,有利于土壤碳、氮素固持。

Abstract:Urea is the most popular N fertilizer used in China.Field experiments were conducted to investigate the effects of nitrogen application on the quantity of microorganisms,activity of enzymes and yield of Chuzhou Chrysanthemum morifolium Ramat.Results showed that urea application had significant effects on the quantity of microorganisms and activity of enzymes.Change of soil bacterium,fungus,actinomycete and soil enzyme activity of protease,catalase,urease showed a single-peaked curve,respectively with the in...

Abstract:Effects of sulfur and cadmium interactions on antioxidant enzyme activity in hyperaccumulator-Sedum alfredii Hance were investigated in hydroponic culture.The contents of MDA in leaf were decreased with sulfur application under three cadmium levels,significantly decreased by 12.4% in Cd0 and S2 treatment.On the contrary,the contents of MDA were significantly increased from 18.4% to 137.7% with increasing cadmium level.There were significant effects of sulfur and cadmium interactions on antioxidant enzyme ac...

Abstract:In order to identify the soil microbial on the extent of saline and alkaline reaction of soil quality,microbial flora,seasonal variation,composition and microbial diversity of alkalization and salinization soil were studied using plate dilution and Biolog microbial identification system of the Yinchuan plain in Ningxia.The results of micrbial flore,seasonal change,structure and composition and the relationship between number of microbial and soil nutrient of different type and degree saline-alkali soil in N...

Abstract:The soil enzyme activities can reflect the soil fertility and healthy status directly or indirectly.Soil samples were collected from 7 revegetations in Huangwu county,Yantai city,Shandong province,and their activities of urease,peroxidase,catalase and polyphenol oxidase,soil physicochemical properties,number of soil bacteria,actinomycete and fungus were measured.Its aim is to analyze the impact mechnism of revegetation types on the soil enzyme activities to provide scientific references for reasonable veget...

Abstract:Soil microbial biomass,respiration,and metabolic quotient are the sensitive indicators of soil quality.Soil microbial biomass,basal respiration,qMB and qCO2 under different vegetation restoration stages,including herbaceous community,shrubby community,arboreal community stage and comparison slope farmland,in Karst gorge district of Guizhou province were studied.The results showed that microbial biomass,basal respiration and qMB decreased from slope farmland to herbaceous community,and increased from herbace...

Abstract:For contrast with abandoned land,through measuring soil samples in 0-20 cm and 20-40 cm soil layers,and using statistical analytical method,the distribution characteristics of soil microorganism and soil enzyme activities of typical oasis farmlands for Citrullus lanatus(Thunb.) Matsum.et Nakai,Zea mays L.,Helianthus annuus Linn.and Medicago sativa Linn.in the Ulanbuh sandy areas were studied systematically.The results showed that:(1)Microorganism quantities was bacteria(107)>actinomycetes(105)>fungi(103),am...

Abstract:选用天然风化煤和pH 3.63的酒厂废弃物酒糟、MV菌剂为活化剂,与PB、PC微晶化磷矿粉在30℃下发酵研究对枸溶性磷的活化效果。结果表明,MV菌剂促进微晶磷矿粉有效P的溶解,且磷矿粉变细解磷效果增强;酒糟、风化煤促进微晶磷矿粉有效磷的溶解;MV菌条件下的酒糟、风化煤有利于微晶磷矿粉的活化,有效磷含量在25d达最高;酒糟对微晶磷矿粉的活化效应2∶1>1∶1,25d枸溶性磷J6、J8、J2和J4分别比对照J净增长了1.63%,1.42%,1.32%及1.22%;MV菌条件下风化煤参与的发酵,25d处理F6、F8、F4和F2枸溶性磷分别比对照F增长了2.15%,2.13%,1.82%和1.77%。

Abstract:Through field sampling and test in lab.,the contents of available and bioavailability of lead and cadmium in soil of vegetable plantation in Beibei district of Chongqing were analyzed.The results showed that: In the study area,the average contents of the available of lead and cadmium were 3.114,0.051 mg/kg of vegetable plantation,the biological validity coefficients were 7.7%,25.1%;The average contents of the lead,cadmium in cabbage edible part was 0.123,0.021 mg/kg,the enrichment indexes were 0.4%,9.8%;fro...

Abstract:Three volumes of anaerobic water and the output of three stages of livestock wastewater treatment mixed with groundwater were used as irrigation water three years in the area where maize-wheat rotated.As the monitoring of potassium,calcium,sodium,magnesium concentration in groundwater,the results showed that:(1)The change trends of potassium concentration in groundwater with different volume of anaerobic wastewater was Ha>Ma>La,with the three tragedy of livestock wastewater treatment mixed with groundwater,...

Abstract:The BCR continuous extraction was used to research the soil Cu and Zn contents change and its spatial variability after 31-year fertilization treatments on Shenyang Agricultural University brown earth long-term localization experimental field.The experimental results showed that compared with the baseline,the contents of the water soluble Cu,the weak acid soluble Cu and residual Cu decreased,the contents of oxidizable Cu and reducible Cu decreased in fertilizer area while in organic fertilizer area the tren...

Abstract:The hazard of heavy metals in sewage sludge is one of the most important factors that influences land use;the hazard of heavy metals not only depends on the amount but also on the speciation,which could react on the migration and the bioavailability of heavy metals.The experiment studied the speciation of heavy metals(Cu,Zn and Pb) after composting of sewage sludge including sawdust as regulator and fly ash as a passive agent.The results showed that composting could make Cu more active but adding fly ash co...

Abstract:To clarify the soil nitrogen forms concentration and storage along saline-fresh water of Minjiang river estuarine wetland,nitrogen forms concentration,storage and influencing factors were measured and analyzed.The results showed:The averaged values of soil total nitrogen,organic nitrogen,NH+4,NO-3 concentration were 0.33,1.12,1.60 g/kg;0.33,1.11,1.58 g/kg;0.97,12.36,20.04 mg/kg;0.85,0.87,1.24 mg/kg and storage were 41.16,104.91,114.35 t/km2;41.04,103.75,112.91 t/km2;10.06,119.20,148.43 kg/km2;713.83,887.18,...

Abstract:Four field investigations and in-lab simulation experiments were carried out respectively in October 2008,May and August 2009,August 2010 in the wetlands of Yellow River estuary.Dynamic distribution and influencing factors of phosphorus contents in soil were studied and results showed that:Phosphorus contents in soil of agriculture area were higher than those of in natural wetlands.Horizontal and vertical variations of total phosphorus(hereinafter abbr.as TP)contents were relatively insignificant,which were...

Abstract:By simulating malic acid/malate contents in forest litter leachates,the effects and mechanism of different concentrations of malic acid/malate solutions on phosphorus(P) availability of air-dry dark brown forest soils were studied.By pot experiments,the role of malic acid/malate solutions on solublizing P were validated in natural dark brown forest soils,and the effects of malic acid/malate on P absorption of Larix olgensis and Fraxinus mandshurica seedlings were also discussed.The results showed that,malic...

Abstract:To verify the effect of phosphorus on the speciation and distribution of aluminum in the roots,two buckwheat cultivars(Jiangxi buckwheat,Al resistant cultivar;and Neimeng buckwheat,Al sensitive cultivar) differing in Al resistance were used to compare Al tolerance between cultivars.Additionally,the total Al content,monomeric Al content in roots and Al distribution in root tips were measured as indicators of the effect of phosphorus on Al.Compared to a single Al treatment,phosphorus pretreatment increased re...

Abstract:To further understand the characteristics of seasonal variation of phosphors species in lake surface water,the contents of phosphorus species in water of Changshou Lake were continuously monitored in July,2009(high-water period),November,2009(normal-water period),and March,2010(low-water period),and the correlations between phosphorus species and water quality parameters were also analyzed.The results showed that dissolved total phosphorus(DTP) was the main existing forms in total phosphorus(TP) in the lake...

Abstract:Taking the Caragana korshinskii which is the main planted tree species in Jinchuan Tailings Bank as the plant material and local main heavy metal element Ni,Cu as the research object,the study on the heavy metals' contamination of Caragana korshinskii and soil in Jinchuan Tailings Bank indicated that the soil there was not only extremely barren,but had a high content of heavy metals as well,The contents of Ni and Cu in the soil were beyond grade three of national standards for environment quality,and the so...

Abstract:Bioaccumulation and translocation characteristics of polychlorinated organic pollutants(PCOPs) in vegetables were studied by using the method of field investigation and sampling,potted plant in glasshouse and laboratory analyses.Results showed that bioaccumulation and translocation factors of vegetables sampled from field were different,bioaccumulation factors of leaf-vegetables to hexachlorobenzene(HCB) were the highest,translocation factors of root-vegetables to dichloro-diphenyl-trichloroethane(DDT) were...

Abstract:The effect of 1 mmol/L exogenous spermidine on remediation of heavy metal polluted municipal sludges with Phytolacca americana L.,was investigated in this paper.The results showed that the root growth and biomass of P.americana L.increased by more than 1.5 times under exogenous spermidine treatments.In addition,the contents of chlorophyll a and total chlorophyll increased significantly,and the loss of chlorophyll reduced.The absorption of Cd and Hg of municipal sludges and their transport and enrichment in ...

Abstract:In order to understand fully characteristics of soil acility and alkalinity,metal element contents of citrus orchards in Chongqing,soil pH and available nutrition content of agrochemical soil(around trees crown) and background soil(between tree lines) from 104 citrus orchards were detected in 2008.The results showed that soil pH decreased by 9.6% in 84.6% citrus orchards and soil pH value was below 6.5 in 56.8% citrus orchards.Soil pH were below 5.5 in 32.7% citrus orchards.Around 7.8% citrus orchards did n...

Abstract:Compared to soil heavy metal values as 75 period of Daqing city,soil background values of Heilongjiang province and the state soil environment quality standards,the content rules of ten soil heavy metals in different landuse types were analyzed by using contrast analysis method,and the assessment of ecological risk was also studied.The results showed that the contents of soil As,Zn,Hg and Pb were the highest in industrial land,and the contents of soil Cd,Cr,Cu,Ni,Mn and V were the highest in dry land.The so...

Abstract:An incubation experiment was conducted to study immobilization of arsenic in mining area soil by two kinds of material,namely,iron-containing materials(Fe2O3,Fe2(SO4)3) and rare-earth materials(CeCl3,LaCl3).The results showed that Fe2O3 had little effect on immobilization of soil arsenic,attaining only 3.81% decrease in exchangeable arsenic at an application of 8 g/kg(Fe).On the contrary,the other three materials proved to be effective in immobilizing arsenic.Fe2(SO4)3 was the most effective as well as LaCl...

Abstract:Based on the statistic data of crop yield and farmland produce investment in the period from 1990 to 2009,carbon emission,carbon absorption and carbon footprint of the farmland ecosystems were estimated in China.Conclusions were reached as follows:Carbon emission amount and intensity,carbon absorption amount,and carbon footprint on the increase,carbon absorption intensity was stable,with the large number of agricultural use of fossil energy,carbon footprint per unit area of 0.08 hm2/hm2 rose from 1990 to 20...

Abstract:As an important species in arid valley,brushwood is widespread in the upper reaches of Minjiang river,human deforestation,reclamation and overgrazing are the fundamental driving forces for its degradation.By selecting soil profiles under brushwood vegetation,meanwhile,taking farmland(50 a) and abandoned land(10 a) as references,soil organic carbon(SOC),heavy-fraction organic matter(HF-OM) and readily oxidizable carbon(ROC) for these soil profiles were analyzed and compared.The results indicated that:The SOC...

Abstract:土壤团聚体是土壤结构的基本单元,对土壤物理化学性质及生物化学性质具有重要影响。通过湿筛法对新疆水稻土团聚体及其有机碳的变化进行研究。结果表明:稻田土壤总有机碳随着种植水稻时间的延长而增加,种植水稻100a土壤总有机碳比荒地的增加了28.35g/kg;荒地开垦种植水稻后,随着种稻时间的延长,土壤水稳性团聚体(>250μm)和微团聚体(53～250μm)显著增加,<53μm矿物结合态团聚体则显著下降;水稳性团聚体和微团聚体有机碳随植稻时间的延长而显著增加,矿物结合态有机碳含量呈现下降趋势,不同粒级土壤团聚体有机碳之间存在明显差异。荒地开垦种植水稻有利于新疆水稻田土壤总有机碳、水稳性团聚体及其有机碳的积累,有利于土壤结构的改善和提高。

Abstract:Through analysis of soil particles situation in 4 different forestlands of Quercus aliena,Lithocarpus fangii,Cryptomeria fortunei and Phyllostachys heterocycla cv.pubescens in Simian mountains in Chongqing,the relationship between different forestland soil particles characteristics and soil erosion was discussed.The results showed that most of the forestlands soil were good gradation soil except Cryptomeria fortunei.Phyllostachys heterocycla cv.pubescens forestland.Surface soil particles dispersion was lowe...

Abstract:In this paper,the relationship between the composing of exchangeable base cation in soil aggregate and soil glomeration of greenhouse in Shouguang were studied with the greenhouse soils of continuous cropping years of 2,5,8,and 10,and with the open field soil nearby as control.The results indicated that the average contents of exchangeable K+,Na+,Ca2+ and Mg2+ distributed evenly in more than 0.25 mm macroaggregates and higher than that of less than 0.25 mm microaggregates.Along with the continuous planting ...

Abstract:The distribution characteristics of soil water-stable aggregates in the conversion of farmland to tea plantations and the organic carbon contents in soil water-stable aggregates were studied by the combinative means of field investigation and laboratory analysis.The results showed that:(1)Soil water stable aggregates of the total proportion of aggregates were dominated by <0.25 mm particle size,and the particle size and the other were significant differences.Except for 2~1 mm particle size,the same size par...

Abstract:For searching the characteristics of volume fractal dimension of purple soil particle in the Three Gorges reservoir region and the relationship between volume fractal dimension and the main features of purple soil,twelve soil samples from the four kinds of land use and three soil profiles within 0-40 cm depth were presented and tested,and the soil particle size distributions were measured by Mastersizer 2000.Some conclusions could be drawn as follows:The volume fractal dimensions of neutral purple soil(0-40...

Abstract:The pot experiment was conducted to study the effect of animal excrement,animal remnant,herb residues and woody residues on elemental composition of humic acid(HA),fulvic acid(FA) and humin.The results showed as follows: Compared with control treatment(CK),after five years,application of organic materials resulted in significant decrease of carbon(C) and hydrogen(H),but enhanced condensation degree and content of nitrogen containing group,and the role of herb residues was the most obvious.Apart from animal ...

Abstract:采用经典统计学方法,通过网格布点,研究黄土高原坡地表层土壤水分和容重在降雨后不同时段的空间变异特征。结果表明:(1)降雨后第1天,表层土壤水分和容重的变异程度分别为中等、弱变异性;在各坡向间土壤水分呈阴坡>阳坡>山脊的变化趋势,容重为阴坡>山脊>阳坡;(2)降雨后第20天,土壤水分和容重的变异程度均保持不变,但土壤水分在不同坡向间的数量特征发生改变(阴坡>山顶>阳坡),而容重的变化趋势保持不变;(3)表层土壤水分具有弱的时间稳定性,而容重的时间稳定性较强。(4)相关分析表明,降雨后第1天,山脊上的土壤水分与容重具有极显著的负相关关系(P<0.01),而降雨后第20天,阴坡土壤水分(容重)与山顶土壤水分呈显著正(负)相关(P<0.05)。相关结果可为黄土高原坡地水分管理、水土过程调控提供参考。

Abstract:In this paper,a field location experiment on the irrigation system of grape was conducted in arid desert climate region of northwest China,under mulching and without mulching,to achieve its high yield and high efficiency of water use.The results showed that or so 33% of water amount could be saved under mulching,the max daily water consumption and the key water demand period of grape was in berry growth period of its whole growth period.The results further indicated that the total water amount of grape in i...

Abstract:In new-cultivated oasis,by taking main tree species(Populus russkii Jabl.) of backbone shelterbelt as the research object.Under A and B irrigation treatments,simultaneous monitoring stem sap flow,shoots water potential and photosynthetic characteristics,and combined with the data of meteorological factors,analysis and comparison the water physiological characteristics of the P.russkii Jabl.under the 2 kinds of irrigation treatments.The results showed that: Compare with A,B treatment,the stem sap flow speed ...

Abstract:On the basis of the observed data of precipitation,sediment and runoff during1959-1997 years in the Zhifanggou watershed,this paper analysed the relationships between precipitation and change characteristics of inter-annual sediment,and monthly variations,and between the annual precipitation and annual runoff,average annual soil erosion modulus,degree of control in a period and average annual sediment delivering in the same period as well.The results showed that the rainfall distributed uneven during the ye...

Abstract:The experiment was conducted at the agronomy experimental station of Shandong agricultural university during the summer maize growing season in 2010.The objective was to investigate the effect of straw mulching on grain yield and soil water dynamic change of super-high-yield summer maize.Field experiments involving straw mulching with 0,0.6,1.2 kg/m2(D0,D0.6,D1.2,respectively) were conducted.The results showed that under the conditions of different straw mulching,the grain yield in case of D0.6 and D1.2 wer...