不同林龄植被培肥改良土壤效益研究

在黄土丘陵沟壑区森林植被能够明显改善生态环境 ,防止土地退化 ,提高土壤中有机质、速效氮和速效钾的含量 ,降低土壤pH和容重 ;快速显著地增加土体中 >0 .2 5mm水稳性团聚体和 >5 0 μm微团粒的数量 ,使土壤结构改善 ,协调供应养分和水分的能力提高 ;能促进黏粒形成 ,坚实度增加 ,土壤的抗蚀性和抗冲性提高 ,有效地减少水土流失。植被对土壤的培肥改良是一种正向持续反馈机制 ,时间越长 ,效益越显著

Forest vegetation can ameliorate obviously eco environment, prevent land deterioration, improve the content of soil organic matter and available N, K, and drop soil pH and bulk density, add remarkably the quantity of water aggregate(>0.25 mm) and micro aggregate(>50 μm) of soil, which can make soil construction better, improve the capacity of providing nutrient and water, enhance the formation of clay and more solidity, increase soil anti erodibility and anti scourability and decrease effectively ...