【摘要】 以典型黄土丘陵沟壑区不同退耕年限刺槐林为研究对象,采用实地调查、土壤室内分析和数理统计相结合的方法,研究了黄土丘陵区人工刺槐林等高种植的土壤养分生态效应。结果表明:随植树年限的增加,植树坑外与坑内土壤全钾、总有机碳、活性有机碳含量呈先增加后减少的变化趋势,pH先升高后降低,而土壤阳离子交换量呈先减少后增加的变化特征;随土层深度的增加,除土壤pH外,土壤养分呈减少趋势;坑内平均土壤全钾、总有机碳和活性有机碳含量分别比坑外增加了1.99%,4.94%和3.93%,说明人工刺槐林等高种植有利于改善黄土丘陵区的土壤养分。更多还原

【Abstract】 Robinia psedudoacia plantations with various ages in the loess hilly region of western Shanxi were studied to investigate the ecological effects of soil nutrient inside and outside the contour pit by using the method of field survey,indoor analysis and statistics.The results showed that the contents of soil total potassium(TK),total organic carbon(TOC),labile organic carbon(LOC)and soil pH inside and outside the pit increased at first,and then decreased with the increasing forest age,while soil cation exchange capacity(CEC)had the opposite change trend.Except soil pH,soil nutrient decreased with the increase of soil depth.Compared to outside the pit,average TK,TOC and LOC inside the pit increased by 1.99%,4.94%and 3.93%,respectively,suggesting that the contour cropping of Robinia psedudoacia plantation was more conducive to improving the soil nutrient.更多还原