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水土保持效益研究
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  benefit of soil and water conservation
     Benefit of Soil and Water Conservation of Hybrid giant Napier on Abrupt Slopeland
     陡坡地皇竹草水土保持效益研究
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     The benefit of soil and water conservation of Eulaliopsis binata
     龙须草水土保持效益研究
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  “水土保持效益研究”译为未确定词的双语例句
     Study on Soil and Water Conservation Benefit of Models of Eco-agriculture on Dry Slope Land in Yuanmou Dry Hot Valley
     元谋干热河谷区旱坡地生态农业模式的水土保持效益研究
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     Study on soil and water conservation benefits of small hydropower for fuel in rural areas
     小水电代燃料生态保护工程的水土保持效益研究
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     Soil and Water Conservation Benefits of Terracing on the Slope
     坡改梯的水土保持效益研究
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     Study on Soil and Water Conservation Benefit of Ecological Protection of Riverbanks
     河道生态护坡技术的水土保持效益研究
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     Study on the Initial Soil and Water Conservation Benefits of Yangtiz River Protective Forest
     长江防护林(四川段)初期水土保持效益研究
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     A STUDY ON THE BENEFIT OF SOIL AND WATER CONSERVATION FOR ENERGY FOREST
     薪炭林水土保持效益研究
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     The benefit of soil and water conservation of Eulaliopsis binata
     龙须草水土保持效益研究
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     Study on Benefits of Soil and Water Conservation of Mulberry Field in Hilly Area
     山地桑园水土保持效益研究
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     Research on Benefits of Soil and Water Conservation in Suburbs
     城郊水土保持效益分析研究
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     Study on Comprehensive Benefits of False Indigo for Soil and Water Conservation
     紫穗槐水土保持综合效益研究
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  benefit of soil and water conservation
In comparison with the traditional tillage systems, crop production increased 10-20% and the benefit of soil and water conservation was 40-90%.
      


Using an index of depletion coefficient of soil water,the dynamic processes of soil water at 15 plots in rainy season is analysed, and the empirical equations with depletion coefficient are derived.The results could be used to quantitatively evaluate the effects of vegetation, landforms, plantation measures on the depletion of soil water in rainy season of each year,and to estimate the rules of soil and water loss and the benefit of their conservation.

本文采用土壤含水量消退系数指标,对15个观测点的雨季土壤水分动态过程进行了计算分析,得出了消退系数的经验方程。研究结果可用于定量地评价该地区的植被、地形地貌、造林整地措施在雨季对各层土壤耗水能力的影响和预报雨季土壤含水量变化,还可用于定量地开展水土流失规律和水土保持效益研究

Special attention has been paid, in the present study, to the variations of suspended sediment size distributions in the tributaries as well as in the main stream within the middle reach of Yellow River with respect to regional waterandsoil conservations and the human activities. It is revealed that the conservations of water and soil in various catchments between Hekou and Longmen have significant impacts on the sediment size distributions in their corresponding rivers, and principally reduce median diameters...

Special attention has been paid, in the present study, to the variations of suspended sediment size distributions in the tributaries as well as in the main stream within the middle reach of Yellow River with respect to regional waterandsoil conservations and the human activities. It is revealed that the conservations of water and soil in various catchments between Hekou and Longmen have significant impacts on the sediment size distributions in their corresponding rivers, and principally reduce median diameters of the grain groups. The sediment distribution functions in the study area are found to be controled by both the geomorphologic factors and the types of conservation activities in addition to the hydrological/hydraulic effects. For the hilly ground in Loess Plateau, the sediment size distributions in the rivers are fairly presented by the normal distribution with two important parameters, median grain diameter and the mean square deviation, which are altered by the specific mechanical practices and the landforms, respectively. For the sand gravel hilly ground, a Pearson Ⅲ type function is a good approximation for the sediment gradings, with three parameters altered by the conservation measures. The topic presented herein is of great value but is rarely approached in the previous studies. The applications of the findings are discussed in greater details in the companion paper.

过去关于水土保持措施影响的研究多侧重于减水减沙的影响,对泥沙组成影响的研究则相对较少。本文以大量的实测资料为依据,以河口至龙门间区域自然与水土保持条件为背景,将水保措施类型、河道水流泥沙条件与流域地貌条件结合考虑,借助统计分析方法对采用水保措施前后该区域(尤其是与黄河中游水土流失密切相关的黄土高原与沙砾丘陵区域)的泥沙粒径分布变化进行了探讨。分析表明,泥沙粒径分布变化极其复杂,对应于不同地貌类型条件的泥沙组成遵循不同的分布规律。黄土丘陵区河流中的悬移质泥沙级配服从正态分布规律,而沙砾丘陵区河流中的泥沙级配则服从皮Ⅲ型分布规律。当分布函数的类型确定后,泥沙粒径分布由该分布函数的几个参数共同决定,这些参数分别反映了泥沙从流域表层搬运到对应级别河流的过程中地貌形态及水土保持措施的影响。文中由多学科综合研究得到的结论,对黄河中游水土保持效益研究具有重要意义。

The modeling erode rainfall device by using moni-spray gun to change rain intensity has been made through many times select experiments. More 250 times experiment resultsshowed that the device has an area of 20~ 40m2 supplyed for efficient rainfall formed. The reIation between rainfall intensity I and supplying water pressure P is as follows: I = 13. 017P1.456,r = 0. 978. The rainfall equality coefficient K ≥0. 80. The rainfall motive energy E , the size a and the med direction d50% is respectively related to...

The modeling erode rainfall device by using moni-spray gun to change rain intensity has been made through many times select experiments. More 250 times experiment resultsshowed that the device has an area of 20~ 40m2 supplyed for efficient rainfall formed. The reIation between rainfall intensity I and supplying water pressure P is as follows: I = 13. 017P1.456,r = 0. 978. The rainfall equality coefficient K ≥0. 80. The rainfall motive energy E , the size a and the med direction d50% is respectively related to P as follows: E = 6. 374P0.459,r = 0. 928,a = 0. 919P0.259,r = 0. 909,d50t = 0. 856P0.258,r = 0. 880

通过多次筛选试验研制出的单喷头变雨强模拟侵蚀降雨装置,以250余次的性能检测试验的结果表明:①该装置的有效模拟降雨面积为20~40m~2;②降雨强度I与供水压力P的关系为I=13.017P~(1.456),r=0.978;③降雨均匀系数K≥0.80;④雨滴动能E,尺度参数a和中数直径d_50%与供水压力之间的关系分别为E=6.374P~(0.459)、r=0.928;a=0.919P~(0.259),r=0.909;d50%=0.856P~(0.258),r=0.880。除了具备传统侧喷式模拟侵蚀降雨机的功能外,该装置还具有体积小、重量轻、能耗低、移动方便、易操作、计算简便,性能可靠等特点,特别用于基层水土保持单位进行水土流失监测和水土保持效益研究

 
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