Abstract:Stormwater runoff poses a great threat to local water quality and aquatic ecosystem in rapid urbanizing areas.Six watersheds in the city of Shenzhen were selected for study on characteristics of stormwater runoff in four rainfall events.Six indicators of water quality(CODCr,NH3-N,TN,TP,SS and BOD5) were analyzed for the characteristic of water quality and the first flush phenomenon.It could be concluded from the water quality analysis that SS,CODCr and BOD5 were relatively significant in nonpoint source pol...

Abstract:The coupling effect on erosion and nutrient lost of arable,grassland and woodland,were studied based on different land-use patterns,with simulated rainfall equipment.The results showed that the runoff and sediment caused the soil became less fertile.The nutrient in sediment was higher than that in run-off,which was the main ways of nutrient losses.Man-made accelerated erosion caused by arable land tillage,soil erosion rate(SER) and sediment yield(SY) increased by 27.1% and 27.3%,but runoff yield(RY) decreas...

Abstract:研究黄土高原北部水蚀风蚀交错区——陕西吴起县退耕还林以来各林地的水土保持效益,对油松沙棘混交林(Pinus tabuliformis+Hippophae rhamnoides)、沙棘林地(Hippophae rhamnoides)、油松林地(Pinus tabuliformis)、达呼里胡枝子+赖草地(Lespedeza davurica+Leymus secalinus)径流小区的产流产沙情况、土壤物理性质(土壤孔隙度和容重)、土壤抗冲性、土壤水分状况进行分析。得出以下结论:(1)不同植被类型的林地土壤抗冲性有明显的差异,相同植被类型的林地抗冲性随坡度的增大而降低;林草植被措施具有极强的提高土壤抗冲性的能力;(2)达呼里胡枝子+赖草地、油松林地的径流量最大,油松沙棘混交林的径流量次之,沙棘林地径流量最小;植被类型相同但坡度不同的林地,坡度大的林地地表径流量高;每种林地的径流量随着降雨强度的增大而增大;(3)侵蚀模数按从小到大的林地顺序是:沙棘纯林、沙棘油松混交林、达呼里胡枝子+赖草、油松林地;在植被类型相同、坡度不同的小区,地表径流量和侵蚀模数随坡度增大而增大。从5个径流小区水土保持效益分析结果看,试验小区...

Abstract:A field plot experiment was conducted to study the effects of combined application of organic and inorganic fertilizer on soil nitrogen runoff in vegetable field.The results showed that fertilizer application increased the nitrogen loss via runoff.The highest losses of total nitrogen,nitrate nitrogen and ammonium nitrogen were 4.20,1.22,2.30 kg/hm2,respectively,as treated by inorganic fertilizer alone.The nitrogen loss decreased significantly with the increased combined application of organic and inorganic ...

Abstract:The effect of different nitrogen applied level on nitrogen transformation form and runoff loss content were studied in the north plain region of Zhejiang province by oilseed rape field experiments.The results showed that,the fertilized period and rain fertilization interval had a significant influence on nitrogen export form and concentration in the runoff loss water.Nitrate was the main form nitrogen,and the ratio of nitrate nitrogen to inorganic nitrogen was from 0.56 to 0.95 in the runoff loss water.Howe...

Abstract:The study site,a phosphorus-rich region which is located in the Damiao country,Xiage town,Chaohu city,is in the upper reaches of the little Zhegao river.Serious exploration of the region resulted in the formation of a large number of bare areas.Control of soil erosion in this area to reduce phosphorus loss is important to the eutrophication of Chaohu lake.The soil and water conservation of five different planting patterns were studied in the experiment,including D1(bare solpes),D2(Cynodon dactylon community...

Abstract:Effects of optimized fertilization and application of microbial fertilizer on the nitrogen and phosphorus runoff losses under Phyllostachys praecox stands in a small watershed located in the source area of Taihu lake.Results showed that compared with the conventional fertilization treatment the total N concentrations of runoff water under Phyllostachys praecox stands with the treatments of optimized fertilization and microbial fertilizer were decreased by 35.3% and 39.2%,respectively,and the total N losses ...

Abstract:As sheet erosion processes being the first stage and initial form of the evolvement of the erosion on slope,the study of sheet erosion processes plays a great role in modeling the erosion processes and providing a basis for erosion control.An experimental research on sheet erosion processes on loess slope was carried out,and the results showed that erosion rates increased sharply then went to smooth with time both under different rainfall intensities and under different slope gradients,with the turning poin...

Abstract:The simulated rainfall experiment was used to quantify the effects of slope gradients on runoff and soil erosion processes on red earth hillslopes under different rainfall intensity conditions.The results showed that the initial slope red soil runoff rates increased the time in advance with the slope,but weren't obvious,start time of slope runoff was mainly affected by rainfall intensity control sooner or later;slope runoff increased with rainfall intensity increases,with slope gradient was more complex,in ...

Abstract:There was less vegetation on the barren slope due to less nutrition in the soil so that wind erosion and desertification occurred more badly.The experimentation was carried into execution to design different eco-grassland models to prevent wind erosion and improve soil physical and chemical properties in the barren slope in the Miyun reservoir watershed.The results showed that there was more 2 246.9 kg/hm2 of overground biomass in the year when eco-grasslands were planted.And it added to 5 941.6 kg/hm2 grea...

Abstract:Based on the measured streamflow data at Ganguyi hydrological station and the precipitation data of five meteorological stations in Yanhe river basin,annual,seasonal precipitation and streamflow were analyzed for the period of 1952-2008,and the Moving average method,Mann-Kendall test and Sen slope method were employed to detect the long-term change of precipitation and streamflow during the study period.The results showed that the precipitation and streamflow in flood season account for 72% and 64% of avera...

Abstract:The soil infiltration characters were observed in seven different forest types of limestone mountainous by the method combined with field measurement and laboratory analysis.The different forest types were analyzed in order to know which had the best amelioration of soil infiltration capability.The results showed that:(1)Soil infiltration capacity in different forest types were better than that in bare land,and the initial infiltration rate of the mixed with Acer truncatum and Platycladus orientalis,the mix...

Abstract:In facility vegetable field,an experiment with kohlrabi for selected crops had been carried out,to research the effect of three different measures,which were fertilization optimization,C/N regulation and catch crops planting(sweet corn),on the nitrate nitrogen accumulation and leaching in soil.The results indicated that fertilization optimization and C/N regulation were effective measures to reduce and control nitrate leaching in the kohlrabi planting season.The effects on the nitrate nitrogen leaching resi...

Abstract:Both phosphorus(P) and ammonium(NH+4-N) adsorption capacities of fly ash,alumina,activated carbon,burnt stone and vermiculite with physical and chemical characteristics were examined for the potential use as substrate in removing P and N in polluted water.Results showed that: Among the 5 substrates,fly ash was alkaline with the highest Fe,Ca and active Fe,Ca contents,while alumina was acid with highest Al and active Al contents.There was 21.6% of Mg found in vermiculite.Activated carbon had the largest spec...

Abstract:以水为浸提溶液,研究了不同温度、pH和盐离子浓度条件对4种复合改性矿物包膜尿素养分释放的影响。结果表明,温度对复合改性矿物包膜尿素的养分释放速率有显著的影响,在15,25,35℃条件下,随着温度升高,水中养分溶出率均显著加快;盐浓度也是影响养分释放的重要因素,在5%,10%,20%尿素、氯化钾溶液中,随着尿素、氯化钾浓度的增大,复合改性矿物包膜养分释放速率明显降低;pH对复合改性矿物包膜尿素的养分释放的影响因包膜材料不同有所差异。

Abstract:A field experiment was conducted to study the effects of different ratios of controlled-release nitrogen in bulk blend fertilizers and N application modes on soil available nutrition contents,P,K fertilizer use efficiency.The results showed that the release of the 52.5% ratio of controlled-release bulk blend fertilizers in basal application mode accorded with requirement of maize better than the other treatments.Compared with the other applied fertilizers treatments,it increased P fertilizer use efficiency ...

Abstract:The huge specific surface area and surface active group are two typical properties of humic acid.These characters made the humic acid have direct effect on the soil pollution,nutrient fixation,nutrient utilization and nutrient transformation.We used the shock equilibrium method to research how the humic acid affects phosphorus adsorption by change the concentration of humic acid in five typical soils in China.Freundlich,Langumuir and Temkin models were used to quantify the influence degree of humic acid on ...

Abstract:Different phosphorus activators(PA) were added into southern red soil of China to test their activation capability.The results showed that PA could improve available phosphorus contents in the soil effectively,and activations capability of different activators differed.Results of coeffcient analysis and path coefficient analysis showed that the activations capability order were as follows:Low-molecular weight organic acid>humic acid>sodium humate>ethyl allophanate.Meanwhile,PA could improve Al-P,Ca-P,Fe-P a...

Abstract:The effect of combined application of organic manure and chemical fertilizers on N use efficiency(NUE) in paddy fields and the environmental effects in Hang jiahu area were studied by field experiments and 15N isotopic tracer.The results showed that combined use of 150 kg/hm2 nitrogen and 3 000 kg/hm2 organic manure improved the yield of rice by 9.8%~17.7%.The N use efficiency was 47.9%,and 4.8% higher than that of chemical fertilizers only.While combination of 210 kg/hm2 nitrogen and 3 000 kg/hm2 organic m...

Abstract:A non-linear assessment model was used to quantify effects of 28 years' successively winter planting-green manure on reddish paddy soil quality under double-rice cropping system.The reddish paddy soil quality under different winter-planting green manure experimental plots was analyzed based on a 28-year experiment in Key Field Monitoring Experimental Station for Red Soil Eco-environment of Ministry of Agriculture,Qiyang county,China.A soil quality index(SQI) based on four soil functions(i.e.the soil ability...

Abstract:The surface and core sediments from Rongcheng swan lake were collected to study the spatial and vertical distribution of different phosphorus forms,and the relationship between physico-chemical characteristics and phosphorus forms of sediments was also analyzed.Results showed that the concentrations of total phosphorus(TP) of sediments were not high,ranging from 79.15 mg/kg to 565.12 mg/kg.High space diversity of TP and phosphorus forms in sediments among different regions was observed.From the northwest to...

Abstract:In order to explore soil nitrogen and phosphorus accumulation,vegetable yeild and quality influenced by reduction and optimization of nitrogen fertilizer application in peri-urban,two field experiments were carried out in vegetable fields to investigate the environmental and agronomic effects.N was reduced by 20% with following optimized fertilization strategies,referred to as slow-release urea(80%N(CRU));urease/nitrification inhibitors(80%N+QD);soil conditioner(80%N+SC),respectively.The results showed that...

Abstract:A pot experiment was carried out investigate the effects of Aspergillus niger(30582) on the endurance and characteristics of Cd,Zn in soil when oilseed rape growing.The results showed that Aspergillus niger not only had no significant effect on the aboveground biomass,but also decreased the concentrations of Cd,Zn in oilseed rape.The concentrations of Cd in shoot and root of oilseed rape decreased by 31.60%,37.82% and Zn concentration in the shoot and root of plant were decreased by 35.12%,35.74% compared w...

Abstract:In order to discuss the effects of drying and wetting conditions on the capability of ditch sediments purifying nitrogen,different drying and wetting conditions of the simulation tests were performed to study the purification capacity of sediments.The results showed that the purification efficiency of ditch sediments was improved with drying time increasing.At the same time,the concentration of nitrate reached to the peak and then decreased.Finally,the removal rate of total nitrogen under conditions of cont...

Abstract:The contents of Cu,Pb,Zn,Cd and other heavy metals in soil and plant were investigated in the experiment field planted by buckwheat with different fertilization in the collapsed coal mining area located in Xiyu,Taiyuan.The heavy metal absorption by buckwheat under different fertilization modes was discussed.Single factor index method was used for evaluating soil quality,bio-accumulating coefficient for discussing metals enrichment by plants,and Hakanson ecological risk index method on soil potential for eco...

Abstract:Through system monitoring to the hydrochemical characteristics about springs,infiltration waters and drips,it was found that there are different variation ranges among the three types of water in a year.The average concentration of Ca2+,Mg2+,Sr2+ and SO2-4 were 25.55,11.04,0.026,15.39 mg/L in the soil infiltration of water;and 65.76,33.16,0.035,21.18 mg/L in spring water;while 64.37,37.87,0.044,11.38 mg/L in drips.The elements concentration of different kinds of water almost changed simultaneously and coord...

Abstract:Based on field sampling and indoor analysis,both spatial and temporal distribution characters of soil available trace element,including Cu,Fe,Mn,and Zn were studied.Results indicated contents of different soil available trace element showed different trends;and the increase of restoration time favored the content increase of soil available trace element.When the restoration time was over 8 years,contents of available trace element in soil was close to that in natural condition.Different managements also inf...

Abstract:The changes in total organic nitrogen,hydrolysable nitrogen,total phosphorus,available phosphorus,and available potassium and acidity were studied in rhizosphere and non-rhizosphere soil at different development stages in larch(Larix olgensis) plantations by the method of comparison and analysis.The results showed that total amount of acidic,alkaline and free amino acid,hydrolysable nitrogen in rhizosphere and non-rhizosphere soil,neutral amino acid,rapidly available potassium,total phosphorus,available pho...

Abstract:The study,which took the typical high and low yield wineyards for fresh and wine grape,in Huailai county,Zhangjiakou main grape producing area of Hebei province as the object,conducts tracking analysis on characteristics of water and fertilizer inputs in consecutive 2 years,as well as alignment analysis on coordinative supply relations between nutrition of tree body and soil nutrient.The results showed that(1)Total irrigation amount of the high yield wineyards in growing season were lower than that of the l...

Abstract:The spatial heterogeneity and distribution pattern in surface soil layer(0-10 cm) in mixed broad-leaved koren pine forest gap in Xiao Xing'an Mountains were analysed by the methods of the traditional statistics and geo-statistics.The results showed that:pH(CV=5.28%) and available potassium(CV=7.33%) showed weaker variability,other chemical indices exhibited moderate variability.The theoretical models of variation function curve of soil pH,organic matter,total nitrogen,total phosphorous,ammonium nitrogen,nit...

Abstract:The corns were cultured with cross linked polyacrylate amine(CPA) added and arbuscular fungi(AM fungi) inoculated into culture medium,respectively,to study their influence on growth,nutrient uptake and some physiological indices of corn seedlings.The results showed in the medium without CPA the biomass,the content and absorption of phosphorus,the activities of nitrate were improved by fungal inoculation.In the medium with CPA the content and absorption of phosphorus,the biomass of corn were improved while t...

Abstract:通过田间试验与室内分析相结合的方法研究长期不同施肥处理下土壤颗粒组成及其有效磷富集。结果表明,各施肥处理土壤颗粒组成都呈现颗粒愈小比例愈高的规律,而不同施肥处理对同一粒径颗粒含量又有一定的影响。在单施磷肥(P)的基础上,配施氮肥、有机肥(NP、PM、NPM)有利于增加<0.25mm颗粒的比例,以NPM处理最为明显。长期施用有机肥改善了土壤颗粒中有效磷水平,但也提高了土壤颗粒有效磷中水溶性磷的比例。土壤中的有效磷(包括速效磷、水溶性磷)主要富集在<2mm粒径的土壤颗粒中,<0.25mm的土壤颗粒中有效磷富集率最高。氮磷配施(NP)、氮磷有机肥配施(NPM)有利于增加<0.25mm颗粒中土壤有效磷的富集,PM处理更促进土壤有效磷在0.25～2mm粒径中富集。

Abstract:运用分形模型研究了重庆四面山几种林地土壤颗粒的分形特征,并探讨了分形维数与粒级分布的关系及其影响因素。结果表明:①0-60cm土壤分形维数平均值的顺序为:针叶林>针阔混交林>楠竹林>阔叶林,阔叶林和楠竹林土壤具有相对疏松、通透性好的结构,而针叶林和混交林地土壤质地较细,具有较好的持水保肥性能。②随着土层深度的增加,阔叶林地土壤的分形维数减小最为显著,楠竹林地呈增大的趋势,而针叶林和针阔混交林地减小不显著。这种变化与4个剖面上粘粒含量的变化规律完全一致。③分形维数能够表征土壤颗粒的大小和数量,但对不同粒级颗粒含量的反映程度不同,主要由粘粒含量决定(R=0.964),与砂粒含量显著负相关(R=-0.873),与粉粒含量相关关系不显著(R=-0.004)。④多元回归分析表明,分形维数与有机质含量、全氮、有效磷、速效钾、毛管孔隙度、非毛管孔隙度、饱和含水量、毛管持水量和田间持水量具有一定的相关性。

Abstract:According to the analysis of 60 sampling points which located in Shanghuang small watershed in loess hilly area.Using geostatistics method analyzed spatial variability of soil organic carbon(SOC) contents.The results indicated thats the SOC contents decreased with the increase of soil depth and in different land use patterns,there existing significant differences.The SOC contents of surface 0-10 cm with 9.544 g/kg was obviously higher than that of 10-30 cm and 30-60 cm which were 7.10 g/kg and 4.63 g/kg res...

Abstract:应用碳稳定同位素分析方法对内蒙古短花针茅荒漠草原土壤有机质及其δ13 C值垂直分布特征、表土δ13C值与建群种-短花针茅δ13 C值的相互关系进行分析,并测定土壤部分理化性质。结果显示:表土有机质含量变化范围为4.17～20.45g/kg;随深度增加,土壤有机碳(SOC)含量呈指数降低,其变化范围为17.98～1.39g/kg,而δ13C值则随剖面深度增加而明显富集,到75cm深度时δ13C值又迅速降低,变化范围为-26.38‰～-13.72‰,变幅>3‰,说明该地区气候和植被状况可能发生过剧烈变化;表土和植物δ13C值分馏程度较其它地区偏大,二者呈极显著相关(r=0.555,P<0.01),进一步说明地上植被状况是影响土壤有机质δ13 C值垂直分布特征的决定性因素。

Abstract:在辽东湾沿岸区域采集了20个土壤表层样和7个非耕作土壤剖面样(其中一个为标准剖面),通过对采集的土壤样品中的137 Cs进行测量与分析,确定该区域土壤中137 Cs的背景值,并探讨了土壤中137 Cs的分布特征。结果表明,研究区137 Cs的背景值为(1 704±40)Bq/m2;表层土壤中137 Cs的比活度范围为0.84～19.90Bq/kg,不同土地利用类型表层土壤中的137 Cs比活度有明显差异,比活度高低依次为:草地>盐碱地>耕地;非耕作土壤剖面中137 Cs的总量范围为65～1 535Bq/m2,大部分土壤剖面中137 Cs呈指数递减分布,且剖面中的137 Cs发生不同程度的流失,而受到沉积扰动作用的剖面中137 Cs分布无规律。通过探讨辽东湾沿岸区域土壤中137 Cs的背景值及137 Cs的分布特征,为利用137 Cs示踪技术定量研究该区域物质输移和辽东湾沉积物来源提供依据。

Abstract:The study was conducted with brown soil(0-20 cm and 20-40 cm) in Shenyang agricultural university experimental station in order to research effecting mechanism of turnover,no-tillage,totary tillage on growth of maize's root.With pot experiment,it researched the impacts of different soil bulk density and sample from different soil layers on enzyme activities(polyphenol oxidase,catalase,acid phosphatase,urease,invertase).The results showed that the influence of different soil layers and different bulk density...

Abstract:A trial of vegetation transformation by gradually replacing chestnut with tea and bamboo(phyllostachy pubescens) was conducted in 1999 in order to restoration of soil quality of chestnut forest.Soil under different forest was collected to evaluate the effect of vegetation transformation on soil qualities in 2009.In comparison with chestnut forest,total organic C of surface soil(0-20 cm) under tea and bamboo forest were respectively increased by 15.05% and 10.47% after 10 years substitution,subsoil of layer ...

Abstract:The objective of the study was to determine the seasonal dynamics of soil microbial biomass contents and enzymes activities in Caragana microphylla plantations for sand-fixation in the Horqing sandy land.Soil samples at the depths of 0-10 cm,10-20 cm,20-30 cm,30-40 cm,and 40-50 cm were collected from the C.microphylla plantations with an age sequence of 6,11,and 24 years and from the natural community.The activities of soil urease,protease,saccharase,phosphomonoesterase,dehydrogenase and polyphenol oxidase ...

Abstract:The paper took degraded quaternary red soil in Jiangxi province as the object of the study.Species diversity and community stability of 7 kinds of rehabilitated forests 27 years later were studied.The results showed that the Marglef richness index(R) were in the order of Pinus massoniana forest without disturbance>Pinus massoniana forest with check dam>Pinus elliotti forest with bamboo-burl-groove>Pinus massoniana forest with planting grass and bamboo-burl-groove>Pinus massoniana forest without check dam>Pi...

Abstract:The Granier-type thermal dissipation probes(TDP) were applied to a naturally-growing Quercus liaotungensis tree in the semiarid loess plateau region to measure the long-term dynamics and azimuthal variations of sap flow on xylem trunk.Air temperature,relative air humidity,and solar radiation were monitored at the same time.In this paper,the correlations among sap flux densities at four different azimuthal directions,effects of different data source on the estimates of whole-tree sap flow and transpiration,a...

Abstract:CO2 effluxes rate was monitored using an infrared gas exchange analyzer(Licor-8100) from May to October.Simultaneously,soil temperature and moisture were also recorded.The results showed that the diurnal fluctuation of CO2 effluxes appeared a single peak.The relationship between soil respiration rate(y) and the variable of soil temperature(t) and soil moisture(w) at 10 cm soil depth could be described by the following exponential equation:y=0.3614e0.1219x(R2=0.702 0,P<0.05)and y=0.9303e0.0812x(R2=0.816 4,P<...

Abstract:The sand storm dust adheres to the crops' leaves,has obvious negative influences to crops' Pn,Tr,Gs and respiration,and even causes the crop output to drop finally.The paper presented gas exchanges on three traditional crops in Minqin.It mainly solved the dust capacity of leaves influence on respiration rate of different crops as well as the different period of duration,the different position of leaves to respiration influence.The results showed that(1)The rate of net photosynthetic rate(Pn),transpiration r...

Abstract:Suaeda salsa is familiar in soil salinization area.Through studying Suaeda salsa community characteristics,soil chemical properties can be inferred.Suaeda salsa spectra and soil chemical property data were gotten through measuring seventeen paired-samples,which were used to study field spectra of Suaeda salsa in response to changes of soil chemical properties.The results showed that second derivative spectrum of 1 121 nm could be used to indicate changes of soil organic matter and soil total nitrogen,and se...

Abstract:In order to improve the eco-environment situation in Loess Plateau,it is important to evaluate the plans for the economic society developing and the model of the soil and water loess,through the way of recognizing the hundreds of soil and water control models objectively.In this paper,hierarchy,stages and regional suitability features on soil and water loss control models were proposed,and the four hierarchies: Regional,watershed,specific underlying surface,and specific issues were pointed out,by the meanin...

Abstract:According to the measured water and sediment data,using comparative analysis,the paper analyzed systematically the effects of store water application of the Three-Gorges reservoir on Yangtze river on water and sediment characteristics in the Dongting lake.The results indicated that:(1)The ratios of split-flow and sediment diversion at the three outfalls of Jingjiang river reduced separately from 18.5%,21.4% to 11.7% and 13.6%,which resulted in that the proportions of runoff and sediment discharge via the th...

Abstract:The transport of pollutants in soil was an important factor in affecting the pollution of the soil and groundwater.The object of this paper was to study the effect of different factors on selenite ion transport in loessial soil.The miscible displacement technique under different experiment conditions was used to obtain the breakthrough curves(BTCs) of selenite ion transport in loessial soil columns.By studio of analytical models(STANMOD) software,the BTCs of selenite ion were fitted with deterministic equil...

Abstract:A pool-simulation field rotation experiment was conducted to assess the impacts of CRF resin residual coating on properties of soil and growth of winter wheat and summer corn after long-term using of CRF in soil.The results showed that the soil bulk density,total porosity,pH and EC of silt and sandy soil could not be reflected significantly when the residual coating was ranged from 90 g/m2 to 360 g/m2 in the soil.And the influences of applied CRF resin residual coating on the content of chlorophyll and root...

Abstract:The issues of grain,population and resources are now becoming increasingly serious in the loess gully area in China,especially under the background of Grain for Green projection from 1999.It is important to evaluate the impacts of Grain for Green projection on the grain productivity and security in the area.In this study,the data of agricultural meteorology in Changwu county in 1993 and 2009 were used to evaluate the grain productivity potentiality.The farmland area and its geographical distribution in 1993...

Abstract:By establishing the runoff plots of three vegetation we carried on the site-specific observation on the soil moisture in the water-wind erosion crisscross region on the Loess Plateau,and analyzed the effect on seasonal variation of soil moisture and water use efficiency.Results showed that soil temperature at 5 cm depth was significantly below air temperature during the growing season;seasonal fluctuations of soil surface moisture at 0-6 cm depth was influenced by the temporal pattern of rainfall.Vegetation...

Abstract:It is particularly important to find accurate calculation method of soil moisture content under drip irrigation.Based on the data from experiments of field and bare land,average moisture content of field of drip irrigation under different moisture was estimated with five methods,such as 1 sampling point average and 3 sampling points average etc.Taking method of layered integration as the standard,the other methods were evaluated.The results showed that the estimated average soil moisture by the F4(three sam...

Abstract:As the shortage of water resource is seriously,reclaimed water has been used on turf as substitute of fresh.Two types of water(fresh water and reclaimed water) were used to irrigate 6 common turfgrasses(Poa pratensis,Festuca arundinacea,Zoysia japonica,Buchloe dactyloides,Radix liriopes,Lolium perenne L.) during 2006-2008.The research results showed that(1) Irrigation by reclaimed water increased nutrients of the turf soil in comparison to fresh water,at the same time,the content of the different nutrient e...

Abstract:By leaching small soil column simulation experiments with salt water,the infiltration characteristics and desalination principle of a sandy loam coastal saline soil,and water saving potential with salt water were studied.The results indicated that,the salt water had a light negative effect on soil infiltration characteristics,but infiltration ability no longer decreased when mineralization degree of salt water was above 15.61 g/L.The change of effluent's mineralization degree could be characterized by three...

Abstract:Through the soil column eluviation experiment in laboratory,the eluviation law of Atrazine in two kinds of soil and its impact factors were studied.The results showed that:When the eluviation rate was increasing from 1.8 ml/min to 4.4 ml/min,the residues of Atrazine in soil decreased,and the leaching increased respectively 10.8%(black soil),8.2%(meadow black soil);At the same time,it was beneficial for inhibiting the moving and outflow of Atrazine in the soil through increasing the content of soil organic m...