黄土高原不同林地植被对土壤肥力的影响

研究了黄土高原油松、刺槐人工林对土壤的培肥效应。结果表明:(1)在黄土高原地区,种植人工林对土壤的有机质、全氮、全磷、碱解氮、速效钾等营养元素含量的提高有很大帮助。但不同林型提高程度不同,除全钾、速效磷以外,各项指标均以阔叶林高于针叶林;阔叶林下土壤阳离子交换量也高于针叶林;总体来看,阔叶林下土壤肥力的提高较针叶林显著。(2)在黄土高原地区,种植人工林可改善土壤发育条件,减弱土壤侵蚀作用,降低土壤的碳酸钙含量,在此方面针叶林的作用比阔叶林明显。

Effect of vegetation on soil fertility in different woodlands on Loess Plateau

The improving effect of the Pinus tabulae formis and Robinia pseudoacacia plantation to soil fertility on Loess plateau was investigated. The results showed that:(1) On Loess plateau artificial plantation had much help for the improvement of soil organic matter,total nitrogen,total phosphorus,available K and other nutritional element contents,but different plantations had different enhancement degrees,except total potassium and available phosphorus,every parameter in broadleaf forest was higher than that in coniferous forest; So was the CEC (cation exchange capacity). In general, the enhancement of soil fertility in broadleaf forest was more remarkable than in coniferous forest. (2) In Loess plateau area, planting plantation could improve the conditions of soil development,decrease soil erosion and reduce soil CaCO3 content, in these aspect,the effect of coniferous forest was more remarkable than that of broadleaf forest.