衬膜沙地农田土壤养分动态和物理性状的研究

采用随机取样法，对景电新灌区衬膜沙地农田和对照吓衬膜农田）土壤进行测定，土壤养分动态分析结果表明，衬膜使0～30cm耕层内土壤养分含量增加，其中有机质、全氮、全磷年均增加率分别为0．02％、0．003％和0．012％，速效磷、速效钾、碱解氮均有明显增加；当年衬膜沙地0～30cm耕层内土壤机械组成中粉沙（＜0．1mm）含量减少10％，中细沙（0.50～0．1mm）对增加10％．衬膜后随着时间的推移，土壤机械组成变细，土壤容重增加，孔隙度减少，衬膜同时对土壤pH值和可溶性盐分含量有一定影响。

Study on the dynamic variation of the soil nutrients and soil physical characteristics of the film-bottomed sandy farmland

Through random sampling, we analyzed the variation of the soil nutrient in the film-bottomed and non-film bottomed sandy farmland in the Electronic-irrigated Secondary Area and drowed the conclusions as follows: the film-bottoming improved the soil nutrient in plough layer (0~30 cm depth), and the rate of the organic matters, the full nitrogen and the full phosphorus amount had gone up 0.02 %, 0.03 % and 0.012 % per year, respectivly. The sandy loam (<0.1 mm) of the plough layer decreased 10% wherease the medium sandy soil increased 10 %- With the time going, the soil mechanical component got fine, the soil unit weight increnyed and the soil porosity decreased. Meanwhile, film-bottoming had effect on the soil pH and the meltable salt content as well