Abstract:土壤分离过程为侵蚀产沙提供了物质准备 ,对它发生、发展的过程进行准确模拟 ,具有重要的实践和理论意义。利用变坡实验水槽 ,在较大流量 (0 .5～ 1 .5 L / s)和坡度 (5°～ 1 5°)范围内 ,系统研究了冲刷时间对土壤分离速率的定量影响。研究结果表明 :不同流量和坡度条件下 ,土壤分离速率均随着冲刷时间的延长而呈良好的幂函数形式下降 (Dr=At B) ,系数 A随着流量和坡度的增大而增大 ;土壤分离速率与坡度和流量间的关系随着冲刷时间的不同而不同 ,当冲刷时间在 1 0 s以内时 ,随着冲刷时间的增加土壤分离速率与流量和坡度间的相关性增大 ,当冲刷时间大于 1 0 s后 ,随着冲刷时间的增大其相关性反而减小 ;以土样下切 2 cm为条件 ,建立了最佳冲刷时间与流量和坡度间的幂函数关系 ,为相关实验径流冲刷时间的设计提供了思路

Abstract:通过玻璃水槽试验和径流冲刷试验 ,初步研究了陡坡坡面水流的流速分布和坡面薄层水流冲刷剥离土壤的过程。研究表明 :陡坡薄层水流流速在坡面上并非是呈直线分布 ,而是呈波浪式分布的 ;坡面水流的剥蚀率(Dr)与坡面径流通过坡面的能量损耗 (ΔE)的关系比其与坡面水流的平均切应力 (τ) 的关系密切 ,建立了黄土坡面土壤剥蚀率估算模型 ,利用这个关系可以直接得到土壤抗蚀性参数和细沟发生的临界能耗条件

Abstract:四川地域辽阔 ,地貌以山地和高原为主 ,农耕地分布范围广 ,旱耕地比重大 ,水土流失和与之相关的旱、洪灾害等生产、生态问题突出 ,既导致农作物产量低而不稳 ,又给长江中下游带来安全隐患 ,因此 ,四川在实施西部大开发战略中 ,除实施天然林保护工程外 ,旱耕地 ,特别是旱坡耕地 (2°～ 2 5°)的水土流失综合治理 ,既具有极其重要的战略位置 ,也是四川农业持续发展不能忽视的重大问题

Abstract:Effects of different methods of application on physical, chemical (soil nutrient) and biological property of degenerated soil were studied in middle part of Tibet. Preliminary results showed that there was marked effect of apply organic manure, especially the organo mineral fertilizer could reduce the bulk density, and improve the porosity, 1~3mm waterstable aggregate, soil nutrient contents, organic matter contents, amount of earthworm under the ecological conditions of the Tibet plateau in a short time, and these increased significantly by the increase of the amount of organic manure. But comprehensive effect of chemical fertilizer (consist of balance manuring) was lower relatively. The organic matter and available potassium increased by a big margin will were vital question in the course of the fertility restoration of degenerated soil. The amount of bacterium account for overwhelming majority of the soil microbes under the different methods of application, and it made a greater contribution to crop nutrition. Soil fungus and actinomyces was relatively less under the applied inorganic fertilizer and organo mineral fertilizer.

Abstract:对塔里木沙漠公路防护林地进行实地观测和试验 ,研究咸水灌溉条件下沙地盐分淋溶后在土壤中重新分配和运移的规律。结果表明 ,沙地可溶性盐灌溉淋溶与蒸发积累过程交替发生 ,时空分布上表现为年内根际各层土壤盐分含量逐渐降低 ,但随着土壤深度的增加 ,2 m以下土壤盐分增加。年际土壤各层盐分含量逐年减少 ,盐分被淋溶到地下水或下层土壤。土壤盐分分布状况是多种因素综合作用的结果 ,灌溉量、灌溉周期、灌溉方式、土壤质地和地形条件是影响防护林地盐分分布的主要因素

Abstract:对流动、半流动、半固定和固定沙地 4种不同下垫面 0～ 2 0 cm气流层的风沙流结构与变异特征研究表明 :(1 )不同退化沙地在总输沙量及各层输沙量上存在明显的差异 ,在 5月 1 5日的测定中 ,流动沙地的总输沙量是 83 .1g/ cm2 .h,分别是半流动、半固定和固定沙地的 2 .1倍、9.2倍和 33 .9倍 ;而在 5月 1 5日的测定中 ,流动沙地的总输沙量 1 0 5.7g/ cm2 .h,分别是半流动、半固定和固定沙地的 5.6倍、1 4.1倍和 75.6倍。(2 )总输沙量的 60以上分布在 1 0cm的高度内 ,随高度的增加 ,输沙量呈负指数函数下降。(3)风蚀物中粗粒 (粒径 1 .0～ 0 .5mm )与极细颗粒 (粒径0 .1～ 0 .0 5mm)和粉、粘粒 (<0 .0 5mm)的含量均很低 ,而细颗粒 (粒径 0 .2 5～ 0 .1 mm)的含量很高 ,占风蚀物的73 %～ 91 %,说明近地表层沙粒的运动以跃移为主。随高度的增加 ,风蚀物中中颗粒 (粒径 0 .5～ 0 .2 5mm)的含量下降 ,而极细颗粒和粉、粘粒含量增加 ,但其增幅因下垫面不同而异。(4) 0～ 2 0 cm总输沙量及各层输沙量与植被盖度呈显著负相关 ,与植株高度、地表紧实度和地表粗糙度长度呈微弱负相关

Abstract:The properties of soil and water loss and organic carbon loss from red soil small watershed under different land use patterns were studied in Zhejing province. The results showed that runoff, sediment and loss of organic carbon concentrated in May, June and August when runoff accounted for 68.78%~73.08% of total loss in a year and both sediment and organic carbon accounted for more than 90% of total loss in a year. The amount of runoff and sediment in bed load form mainly were highest in catchment 5 with less covering vegetation and without soil conserving practice, next extensive farming catchment 1 with less comprehensive measurements for soil conservation, intensive farming catchment 2 and catchment 4 with comprehensive measurements for soil conservation, catchment 3 with vegetation conservation. The amount of loss of organic carbon was highest in catchment 1, next catchment 2, catchment 4, catchment 5 and catchment 3. The amount of organic carbon loss in runoff was equal to that in bed load. From the view of natural resource protection, vegetation conservation practice was the best way to control soil and organic carbon loss. From the point of agricultural production, soil conservation farming practices was the best way both for soil conservation and agricultural production.

Abstract:The types and the current distributed characteristics of rocky desertification were analyzed, specifically explored the causes and forming mechanism of karst eco environmental fragility from the following aspects such as weathering resistance of carbonate rock,the soil forming process of carbonate rock,surface structures of karst landforms, two different kinds of boundary face in karst soil profile, overloaded pressure of population and backward farming methods, etc.Based on the analysis, eco economic model of controlling rocky desertification from three levels of production (technology), ecological (vegetation rehabilitation), lives and rural industrial development and five proposals to harness rocky desertification were suggested according to the concrete conditions of Guizhou karst mountainous regions.

Abstract:With simulated rainfall equipment, the pattern of soil nutrient from terra gialla soil was studied. Result showed that the consistency of nutrient in the runoff and sediment was not interrelated with the rainfall intensities. But the time of superlative consistency emerging was effected by rainfall intensities. There was significant positive correlation between the amounts of soil nutrient loss and rainfall intensities. This experiment also found that the consistency of nutrient in the sediment was exceedingly more than the consistency of nutrient in the runoff. But the primary of the nutrient in runoff was readily available nutrient, so the nutrient removed by runoff could not neglect.

Abstract:结果表明 ,与大豆单作相比 ,黄花菜和百喜草植物篱笆径流量、侵蚀量分别减少了 4 .6 7% ,37.82 % ,植物篱笆处理和大豆单作处理的径流量、侵蚀量与开始形成径流所经历的时间之间呈显著负相关 ,而径流量与侵蚀量之间为显著正相关关系 ,建立了相应的降雨产流、降雨产沙、径流侵蚀回归模型。植物篱笆的水土保持机理表现在 :植物篱笆地上部的缓流和分流作用 ,有效地减弱径流的携沙能力 ,减少了细沟侵蚀 ;地上部分可阻挡土壤大颗粒和过滤土壤小颗粒 ;植物篱笆地下部根系显著改善了耕层土壤的物理性状 ,显著提高了土壤的抗冲性 ;土壤性状显著增强了土壤的入渗能力 ,植物篱笆带在较长的时间内维持较高的土壤入渗量和较大的稳定入渗速率

Abstract:中国水土保持公务管理系统是中国水土保持管理信息系统先行开发的子系统 ,开发目的是为水土保持管理工作中目前亟待解决的公务管理现代化任务 ,提供在网络化、GIS应用迅速普及的背景下的支持。系统设计以“信息共享、办公自动化、灵活定制”三大目标为核心 ,采用先进的计算机网络技术、数据库技术和办公自动化技术 ,以期实现较好的网络应用功能 ,并具有良好的系统安全、稳定性与灵活性

Abstract:Over the last two decades, the great progresses have been made in the application of RS and GIS in hydrology. Especially, from several years ago, an integration of RS and GIS with hydrological models had become technically feasible, so the studies on hydrology came into a new era. This paper reviews on the roots of hydrological GIS, the application of RS and GIS in hydrology and review on the integration of RS and GIS with hydrology. It can be concluded that: In the future, hydrological modeling will be more global, more distributed, and more sophisticated. In this situation, the integration of RS and GIS with hydrology will not only speed up the research on hydrological but also play a great role in water resources management.

Abstract:The main way of soil erosion are wind erosion and water erosion, which have been studied for long time and primary understood the process. Since the particular monsoon climate and geography position in China, that area of double erosion are widely. Double erosion are not wind erosion plus water erosion simply, it is a complex system in which mutual action and recycle. Double erosion study is little inside and outside nation. The complex of double erosion is described, explain type of double erosion based on expatiating drive factor in China. Area and distributing of double erosion are established after those types studied. See it as a particular region, this is very important to environment repairing and realization strategic of west exploitation.

Abstract:The soil erosion is little concerned in low mountains and hills of south Jiangsu province than in the loess plateau and the red soil area because the absolute erosion is small. However the ecological impact caused by soil erosion in south Jiangsu province can not be ignored since the nutrient loss and the soil layer becoming thin there is greater than that in the loess soil and the red soil area. In order to discuss the ecological impact of the soil erosion there the soil erosion rate should be known. The tracer method of cesium 137 ( 137 Cs) is a useful tool. But the two problems should be solved for using this method. One is to decide the 137 Cs reference inventory in the study area and the other is to set up the models of estimating soil erosion. After careful study the 137 Cs reference inventory is decided as 2 200 Bq/m 2 in our study area. The soil erosion estimating models of the cultivated soil and the uncultivated soil are build based on the fundamental physical content. The soil erosion rate and the soil sedimentation rate of the hillside fields in bamboo forest, in tea plantation and so on can be estimated using above two soil erosion models and a soil sedimentation model provided by the other scholars. Then the ecological impacts caused by soil layer becoming thin and nutrient loss are tried to analyze.

Abstract:Cs is an important radionuclide in the environment. It is produced by nuclear test in the atmosphere and nuclear accidents, then existed and accumulated. 137 Cs are used in many fields of environmental geochemistry. The behavior of 137 Cs at high content has researched much more. But pay little attention to the geochemistry behavior of 137 Cs at environmental background level because of the difficulties of research methods and experiment design. For the extensive usage of 137 Cs at several thousand becquerels as a tracer in the soil erosion and lake and reservoir sediment research, these use need detailed understanding of the environmental behavior of 137 Cs. The results showed that: (1) the source and fallout of 137 Cs with time in soil body. (2) the adsorption and fixation in soil composition. (3) input and output of 137 Cs in soil. In the end, the theory of tracing soil erosion and technical path of quantifying erosion using 137 Cs are discussed, the advantages of 137 Cs as a tracer compared to the other radionuclide are concluded.

Abstract:Cs is an important radionuclide tracer, and 137 Cs measurement has been widely used in soil erosion and relative sediment source researches because of its convenience, swiftness and accuracy. 137 Cs technique in China has experienced four stages as follow: imitation and individual exploration, group research, international cooperation and wide utilization. China has owned its standing in this field in the world. The key researches focus on the reference inventory of 137 Cs, the models of soil erosion, erosion rates and relative sediment sources. If 137 Cs can be combined with other tracers using in soil erosion, 137 Cs technique will have a prosperous future.

Abstract:The distributions of 137 Cs in the profile of sedimentation points from cultivated and uncultivated region in red soil were analyzed and described. Results showed that there was a turning point at about 17cm in both profiles. The inventory of 137 Cs in cultivated sediment was higher than that of uncultivated. The sedimentation rate of both sediment points was about 1.03 cm/a from 1963 according to the position of peak. But it was about 0.74 cm/a in recent two decades according to 137 Cs distribution. The result also suggested that the erosion rate became smaller in recent years. There was a good relationship between organic matter and 137 Cs. It could be inferred that the distribution of 137 Cs in erosion sediment may be used as an effective measure to assess the work of water and soil conservation.

Abstract:Using the water resource data from 1994 to 2000 year and the result of the first national water resource evaluation to analyze the water resource distribution and the rule of water resource evolvement in recent 50 years of arid and semi arid regions in north China by statistical method. The identical relation of precipitation and water resource distribution is quantificationally explained of arid and semi arid regions,evaluating the exploitation and utilization present situation of water resource and the balance of water supply and requirement provide reference for optimal configuring water resource,regulating and optimizing agriculture structure and rational exploiting and utilizing the groundwater resource.

Abstract:We propose to study the water required by forestland in the north area of China, which includes the evapotranpiration and soil moisture contents. It is found that when the soil moisture content is below 45% of field capacity of soil and actual evapotranspiration is below 60% of potential evapotranspiration, the growth of trees cannot be sustained. On the basis of our research, we establish the computing method of minimum ecological water requirement of forestland, and take the 45% of field capacity of soil as minimum soil moisture quota of forestland, 60% of potential evapotranspiration as the minimum evapotranspiration quota. The minimum ecological water requirement of forestland of Huang huai hai area is estimated as an example on the basis of the rational area of forestland planned with GIS. The results indicate that the rational area of forestland of Huang huai hai area is 78 thousand km 2, proximately the 18.85% of total area, and the minimum water requirement is about 60.7 billion m 3, 48.3 billion m 3 for evapotranspiration and 12.5 billion m 3 for soil moisture contents.

Abstract:根系结构不同 ,其固持土体的能力存在很大差异。利用分形理论对不同根系结构稳定土体的能力进行了量化比较 ,结果表明 :(1)长江上游暗针叶林生态系统中主要树种根系都表现出了较为明显的分形结构特征 ,高山柳(Salix sp.)的根系结构最复杂 ,具有多层次细微分枝结构 ,分形维数最大 ,达 1.73 5 6 75 ,冬瓜杨 (Populuspurdomii)次之 ,为 1.6 0 16 6 ,峨眉冷杉 (Abiesf abri)分枝结构简单 ,以侧行主根为主 ,分形维数仅为 1.4 4 93 8,并且根系的分形维数随着其年龄的增长而增大。(2 )根系结构与稳定土体的能力明显相关 ,根系直径或树干基径与根系抗拉阻力受环境条件的影响 ,关系较为复杂 ;而根系分形维数更能揭示根系的结构与发育动态 ,根系分形维数与抗拉阻力的对数呈比较稳定的指数函数关系。(3 )峨眉冷杉根系结构简单 ,垂直根系较少 ,且分布层次较浅 ,在冰碛物环境中可以通过在岩石中迂回缠绕而从较大范围内将岩石、土壤等压在其下 ,但结构较为散乱 ;而冬瓜杨以垂直分布为主 ,分布层次较深 ,毛根很发达 ,土壤颗粒间的粘结程度较好 ,二者结合配置将有助于改良土壤结构 ,防治水土流失 ,尤其是超强度水土流失的发生

Abstract:研究了用经济植物篱的形式对四川丘陵坡耕地的治理方法 ,提出了经济植物篱农作模式 ,并研究出了适合不同立地条件的经济植物篱模式 ;对四川丘陵农区坡耕地农作物的平衡施肥问题进行了探讨 ,提出了作物高产施肥的配方 ,为四川丘陵坡耕地的农业结构调整、农民增收、农业生态环境保护提供了科学的模式

Abstract:In Three Gorges area, we adopted level terrace and asigned contour hedgerows, namely applying agroforestry management since 2000. By observing the amounts of sediment and runoff and analyzing the soil fertility, we can conclude that this technique could improve soil physical properties, increase soil hole capacities,reduce soil bulk density and reduce soil and water losses. So, this technique is worth developing in Three George Area.

Abstract:根据 3年定位、半定位观测 ,对长江上游云南松林的降水截持效益、林地土壤物理性状及其蓄水效益 ,以及植被削减地表径流与侵蚀的效益进行了研究。结果表明 :云南松林冠层对降水的截留率为 2 1 .85 % ,树干茎流率为2 .5 0 %。不同结构类型云南松林地土壤物理性状、削减坡面径流与泥沙的效益 ,以栓皮栎×云南松混交林为最好 ,灌木云南松林、草被云南松林次之 ,其土壤侵蚀模数分别为 1 .4 1 ,3 6 .6 0 ,4 1 .4 0 kg/hm2 .a。云南松疏林是森林生态系统退化的表现 ,其水土保持效益最差 ,土壤侵蚀模数达 2 6 4 7.0 6 kg/hm2 .a,是云南松及其混交林地的 6 3 .94～1 877.3 5倍

Abstract:The concentrations of total nitrogen, dissoluble nitrogen, total phosphorus and dissoluble phosphorus in surface runoff were monitored in different sloping land within the Qiandaohu watershed. The results show that the concentrations of nitrogen and phosphorus in surface runoff varied strongly, and the average concentrations in cultivated slope land were high than that in uncultivated slope land. The average ratios of DN/TP and DP/TP had no contrast in different slope land, and the ratios were 0.45 and 0.22. The correlation between dairy rainfall and N and P concentrations under different slope land use pattern was very significant.

Abstract:Based on the method of incubation test and controlling the pH of typical black soil samples, the relationship of soil pH and the effective content of trace elements of Cu, Zn and Mn was studied. The results show that following pH changing 0.5 units, the ratio of high value to the low value of the effective Cu content is about 0.5~1 times in typical black soil, the ratio of effective Mn content is about 3~5 times and the ratio of effective Zn content is about 9~15 times. These indicate that it is great importance of theory and practice for soil diagnosis, proper fertilization of trace elements fertilizer, increasing grain output and realizing sustainable utilization of land that pH value of soil is mastered accurately.

Abstract:准格尔丘陵区位于鄂尔多斯高原最西端 ,是黄河中游水土流失治理、生态环境建设的重点区域。2 0 0 1年 8月中下旬 ,在自然条件下 ,对准格尔丘陵区主要天然优势植物群落百里香群落、沙打旺人工草地和沙棘灌木林的蒸腾耗水特征应用 L I- 1 6 0 0稳态气孔计同时进行野外测定。结果表明 :百里香和沙棘的蒸腾速率都无午休现象 ,百里香蒸腾速率峰值出现在下午 1 6 :0 0 ;沙棘在 1 2 :0 0～ 1 6 :0 0时间段内都呈较高的蒸腾速率 ,两者都为单峰型。达乌里胡枝子、糙隐子草和沙打旺的蒸腾速率日变化曲线则呈不明显的双峰型。以上 5种植物日蒸腾速率平均值从大到小的排列顺序为百里香 >达乌里胡枝子 >沙棘 >糙隐子草 >沙打旺。在连续 3年干旱和人为原因致使沙棘灌木林长势不好的情况下 ,单位面积 (1 m× 1 m )沙打旺人工草地日蒸腾累计失水量最大 ,为 75 70 .5 g,百里香群落居中 ,为 2 0 71 .4 g,沙棘灌木林最小 ,为 1 1 6 9.8g

Abstract:以常绿阔叶林为参比 ,分析了红壤上人工杉木林、毛竹林、茶园和果林 4类商品林地土壤养分贫瘠化状况。结果表明 :在 7项养分指标中 ,土壤全磷和有效磷贫瘠化程度最强 ,中度贫瘠和严重贫瘠两级之和平均达到了6 8.1 5 %和 73 .4 0 % ;土壤全钾和速效钾贫瘠化程度相对较轻 ,特别是全钾中度和严重贫瘠之和只占 4 4 .71 %。比较不同商品林地 ,土壤养分贫瘠化程度为杉木林 >笋用竹林 >茶园 >果林 ,它们的土壤养分贫瘠化综合指标值 (IN-DI)分别为 0 .4 793 ,0 .5 4 86 ,0 .6 0 1 8,0 .6 6 4 7

Abstract:The partition of ecological environment according to disturbance degree can direct and regulate the disturbance intensity and pattern of human activities,favoring to rationally develop resources and to protect ecological environment.Taking Qianxi county,Hebei province,for example,we put forward the principles to select influencing factors,then graded,evaluated them and fixed on their weight by grey system analysis. After comprehensive judge, the ecological environment of Qianxi county was divided into medium degree disturbance area and light degree disturbance area,and further into medium one degree disturbance area,medium two degree disturbance area, medium three degree disturbance area,light one degree disturbance area,and light two degree disturbance area. Aiming at every disturbance area, we indicated the corresponding countermeasures to regulate the intensity and pattern of human activities.

Abstract:Loss assessment of debris flow disasters in scenic spot emphasizes impacts of debris flows on the scenic spot itself. This paper discusses characteristics of the assessment. On the base of analysis of resources, environment and economy in scenic spots under the threat of debris flows, structure model of assessment index is obtained, various indices with their weights and standards are determined, then a synthetic indicator reflecting debris flow hazards is obtained, according to which, grade of hazard is obtained with reference to the table of grade.

Abstract:The characteristics of fertility and microbe in paddy soil under a ten years no tillage and ridge culture are studied and contracted with those of soil under cultivated treatment.It shows:the organic matter,the total and the available quantity of N,P are rapidly increased after ten years of no tillage and ridge culture. But there is not any apparent difference on these characteristics of fertility between the upper and the under layer(0~7.5 cm,7.5~15 cm).The quantity of bacteria, fungi, and actinomycetes from the dilution method of counting and the micro biomass from the method of all samples arrived their highest points in spring and lowest in the early autumn generally. But the ranges changing with seasons of samples from no tillage and ridge culture are narrower than those of samples from cultivated treatment. And for the upper layer under no tillage and ridge culture,the quantity and micro biomass seemed even increased lightly from spring to summer and showed anti seasonal feature.

Abstract:Based on dividing Loess Plateau region within Shaanxi territory into four parts, grain supply and demand in the coming twenty years is estimated. According to forecast of grain situation, the optimum paradigm of returning farmland on hills to forest and grassland as well as grain supply from government is projected.

Abstract:The paper discusses theories and methods of small watershed land utilization plan, four study programmes is posed, firstly analyzing economic system of small watershed, making clear different function of different location of small watershed and trouble; secondly according to natural and social economical feature, studying natural suitability, analysis of economical system input output reveals superiority of agricultural development, decide best agricultural structure of product and optimal goals; thirdly goal programming defines quantitative structure; finally theory and method of landscape ecology define space structure; which will optimize collocation of land resource of small watershed, exerting function and potential of land resource, achieving the goal of small watershed sustainable development.

Abstract:应用“3S”技术进行农业非点源污染预测、控制和管理是最新的动向。为此结合国内外“3S”技术在农业非点源污染研究中的应用现状 ,阐述了“3S”技术在非点源污染研究中的应用意义和方法 ,并对“3S”技术在此领域发展动态进行了展望

Abstract:通过对浙江哩铺铜矿废弃地复垦土壤的微生物特征研究表明 :与对照土壤相比 ,矿区复垦土壤微生物区系发生明显改变 ,微生物总数下降了 6 8.4 %～ 80 .3 2 %。微生物特征发生了显著的改变 ,微生物基础呼吸作用增强 ,但微生物生物量却显著降低 ,微生物生理生态参数 Cmic/Corg、q CO2 值明显升高。矿区土壤在重金属胁迫下 ,削弱了土壤中 C,N营养元素循环速率和能量流动

Abstract:据地貌特征、地质资料、文献记载、考古资料等综合分析 ,确定了渭河西安段春秋战国、唐代的河道位置 ;分析了春秋以来河道北移的平均速率为 1 .74～ 2 .71 m / a,并具有加速趋势 ,以及东西部河道北移速率差异的原因 ;计算了咸阳 -梁村 2 2 km长的河段春秋后期以来 (2 3 0 0 a B.P.- 0 a B.P.)、春秋后期至唐 (2 3 0 0 a B.P.- 1 2 5 3 aB.P.)以及唐以来 (1 2 5 3 a B.P.- 0 a B.P.)河流侧蚀形成的年均土壤侵蚀量分别为 2 4 1 1 87,1 4 2 1 4 9,3 2 3 94 2 t

Abstract:The main objectives were to study the property of holding water of yellow white soil and the effects of applying organic matter on its holding and supplying water by tensiometer. The results of study demonstrated that:(1) In range of tensiometer measurement, there was a kind of obvious linear relationship between soil water suction and content of the yellow white soil; (2) The organic matter can improve the property of soil holding water, and the effect of cow dung is better than wheat straw. And applying organic manure could also improve the upper limit of soil available water, cut down the lower limit, raise the content of soil available water and strengthen the available property of soil water.