不同水土保持措施对坡地养分的影响

Impacts of Different Measures of Soil and Water Conservancy on Nutrients of Slope Land

对不同水土保持措施对坡地养分的影响进行了研究,结果表明:采取百喜草覆盖或敷盖措施的坡地土壤的养分均得到了提高,养分空间分布差异也明显小于裸露对照,养分空间分布规律为上坡大于中坡大于下坡,横坡方向上养分分布差异不明显,养分有明显的表聚性,速效氮的平面空间分布差异大于有机质和全氮,垂直空间上分布差异速效氮小于有机质和全氮;分析表明采取百喜草覆盖和敷盖措施可以有效提高土壤养分含量并且减小养分的空间分布差异,其中以百喜草覆盖措施效果最好。

This article mainly studied the effect of measures of different water - and - soil conservation on slope land＇s nutrient. The results show that slope land＇s nutrient has been all enhanced by taking bahia grass cover or mulching measures. Differences in spatial distribution of nutrient was significantly less than the bare control. The law of spatial distribution of nutrient is that upslope is greater than modreate slope, the down slope is the least one. Nutrient distribution in cross-slope direction has no significant difference. Nutrient＇ surface concentration is very significant. Difference in plane spatial distribution of available nitrogen is greater than organic matter and total N,but the difference in the distribution of vertical space of available nitrogen is less than organic matter and total N. The analysis shows that bahia grass cover and mulching measures can effectively improve the soil nutrients content and reduce the differences in the spatial distribution of nutrients. The conclusion is that the best measure is the bahia grass cover.