共和盆地植物活体沙障对土壤水分及养分的影响

Effects of Living Plant Sand Barriers on Soil Moisture and Nutrients in Gonghe Basin

为探明共和盆地活体沙障的设置对沙地土壤水分和养分的影响,以青海省共和盆地为研究区,选取小麦活体沙障、披碱草+燕麦活体沙障和尼龙袋机械沙障布设区为研究对象,同时以流沙为对照,采用野外调查与室内测定相结合的方法,对比分析了活体沙障设置对沙地土壤水分、有机质含量、全氮、全磷、全钾等养分指标的影响。结果表明:①小麦活体沙障和披碱草+燕麦活体沙障布设区土壤质量含水量分别可达3.48%和4.26%,显著高于流沙地(P<0.05),分别是流沙的2.13倍和2.47倍。②小麦活体沙障和披碱草+燕麦活体沙障布设区土壤有机质、全磷及全钾含量虽高于尼龙袋机械沙障布设区和流沙地,但未达到显著水平(P>0.05),只有全氮含量活体沙障布设区显著高于机械沙障布设区和流沙地。③活体沙障设置对沙地水分和全氮含量具有显著改善作用(P<0.05),有利于沙地土壤的形成和荒漠化的逆转。

In order to investigate the influence of living sand barriers on soil moisture and nutrients in sandy soil,this study selects wheat liv⁃ing sand barriers,alkali grass and oats living sand barriers,and nylon bag mechanical sand barriers in the Qinghai Province’s Gonghe Basin as research objects.Field surveys and indoor measurements are used to compare and analyze the effects of living sand barriers on soil mois⁃ture,organic matter content,total nitrogen,total phosphorus,and total potassium in sandy soil.Results show that:①the soil quality mois⁃ture content in the wheat living sand barrier and the alkali grass and oats living sand barrier areas has reached 3.48%and 4.26%,respective⁃ly,which are significantly higher than that of the sand drift area(P<0.05),and are 2.13 times and 2.47 times that of sand drift,respectively.②Although the organic matter,total phosphorus,and total potassium contents in the soil of the wheat living sand barrier and the alkali grass and oats living sand barrier areas are higher than those of the nylon bag mechanical sand barrier and the sand drift area,they does not reach a significant level(P>0.05),and only the total nitrogen content in the living sand barrier areas is significantly higher than that of the mechani⁃cal sand barrier and the sand drift area.③The setting of living sand barriers has a significant improvement effect on soil moisture and total nitrogen content in sandy soil(P<0.05),which is conducive to the formation of sandy soil and the reversal of desertification.