利用高含沙洪水治沙淤地的土壤养分、粒径分布特征分析

对公乌素引洪灌区风沙地（对照）、新淤地、淤后耕地的0～100cm剖面分层取样，进行土壤养分含量、土壤颗粒粒径组成的测定，以分析利用高含沙洪水淤地治沙后土壤养分、粒径的分布特征。结果表明，新淤地的速效磷含量是原状风沙土的4．2倍，速效钾的2．5倍，碱解氮的2．4倍，全氮的2．7倍，全磷的1．3倍，有机质的3．3倍，其中速效钾、速效磷含量分别达到了全国第二次土壤普查养分标准的极高、丰富等级。将高含沙洪水引人沙漠盆地，经过多年多次淤积，淤积层累计达到或超过耕作层厚度，可以将沙漠变成高质量的农田。利用高含沙洪水淤地、治沙，是减少黄河河床淤积、治理沙漠、开发农田十分有效的途径。

Distribution Analysis of Nutrient and Grain Size of Soil After Silting up Using Flood with High Sand

It sampl the 0~100 cm section of windblown soil and new silt land and silted tilth in the flood irrigation area of Gongwusu,and mensurated the soil nutrient content and grain size constitute,in order to analyze distribution characteristic of nutrient and grain size of the soil after silting up using the flood with high sand.As a result,available P content in the new silt land is 4.2 times than the original shape wind-blown soil,the same available K is 2.5 times,alkali-hydrolysable N is 2.4 times,whole N is 2.7 times,whole P is 1.3 times,organic matter is 3.3 times,and available K content comes to very high grade in the whole country soil census for the second time nutrient standard,available P comes to abundant grade.Through Leading the flood with high sand into the basin of the desert for silting up many times,when alluvium thickness exceed plow,the desert can becomes the high quantity farmland.It is a very valid approach to use the flood with high sand controlling sand and silting land for reducing the yellow river bed silted and controlling desert and developing farmland.