摘要
通过野外考察和室内分析,研究结果表明:在黄土高原地区恢复植被能显著提高土壤有机质和速效氮、钾等营养元素的含量,降低土壤pH 和容重,增加土体中水稳性团聚体的数量,提高土地的生产能力,促进土壤腐殖化和粘化过程的进行。乔木林地速效养分丰富,粘粒和> 0 .25m m 团聚体的数量大;灌丛草地则酸性较强,坚实度偏低,> 0 .05m m 的微团粒含量较高。乔木林地防止土地退化的效益好于灌丛草地。
Based on field investigation and indoor analysis,the results showed that:On the Loess Plateau region, recovering vegetation can improve remarkably the content of soil organic matter and available N,K etc.,and drop soil pH and bulk density,add the quantity of waterstable aggregate of soil,improve the productive capability of land,enhence the process of humification and illimerization;Available nutrients,clay and>0.25 mm aggregate are all rich in high forest land,however,bush grass land shows more acid and>0.05 mm microaggregate and less solidity.The benefit of high forest land is better than that of bush grass land in preventing soil deterioration.
基金
国家"九五"重点科技攻关项目!(960040508)
