陕北黄土丘陵区不同立地条件下刺槐群落的土壤质量评价  

Soil Properties under Planted Robinia pseudoacacia Forest with Different Site Conditions in the Loess Plateau of China

作　　者：黄婷[1] 刘政鸿 王钰莹[1] 张伟[1] 何俊皓[1] 郝文芳[1] 

机构地区：[1]西北农林科技大学生命科学学院,陕西杨凌712100 [2]陕西省水土保持生态环境监测中心,陕西西安710004

出　　处：《干旱区研究》2016年第3期476-485,共10页Arid Zone Research

基　　金：国家林业部公益性行业科研专项(201304312);国家自然基金(41301601)共同资助

摘　　要：以陕北黄土丘陵区纸坊沟流域不同立地条件下的刺槐林为对象,采用综合评价法对其土壤质量进行评价。结果表明:24 a刺槐林的土壤含水量、酶活性大于14 a刺槐林;14 a刺槐林的土壤有机质、全氮、速效养分含量大于24 a刺槐林。阴坡刺槐林的土壤含水量、有机质、全氮、酶活性大于阳坡,但阳坡刺槐林的速效养分含量大于阴坡。随土层深度增加,刺槐林土壤含水量、全氮、速效养分以及酶活性降低,土壤p H升高。土壤质量综合指数为:24 a阴坡>24 a阳坡>14 a阳坡>14 a阴坡,表明林龄越大,土壤质量越好。选择土壤生态环境较好的立地营造植被,更有利于生态恢复。In this study,the planted Robinia pseudoacacia forest with different site conditions in the Loess Plateau of China was selected as the research object,and the soil properties at different sites were analyzed so as to provide the advices for soil and water conservation in the loess hilly-gully region and improve the ecological environment and the rational use of resources. The results showed that the soil moisture content,p H value and enzyme activity under the 24 a R. pseudoacacia forest were higher than those under the 14 a R. pseudoacacia forest,and the contents of soil organic matter,total nitrogen and available nutrient under the 14 a R. pseudoacacia forest were higher than those under the 24 a R. pseudoacacia forest. The contents of soil moisture,organic matter and total nitrogen as well as the enzyme activity under the R. pseudoacacia forest on shady slope were higher than those on sunny slope,but the contents of soil available nutrients under the R. pseudoacacia forest on sunny slope were higher than those on shady slope. With the increase of soil depth,the contents of soil moisture,total nitrogen and available nutrients as well as the enzyme activity under the R. pseudoacacia forest were decreased,but the soil p H value was increased.The integrated soil quality index was in an order of 24 a R. pseudoacacia forest on shady slope 24 a R. pseudoacacia forest on sunny slope 14 a R. pseudoacacia forest on sunny slope 14 a R. pseudoacacia forest on shady slope.Therefore,the older the stand age was,the better the soil quality would be. It is more advantageous for regenerating the ecology to choose a better site conditions of soil ecological environment.

关 键 词：刺槐群落 土壤质量评价 土壤含水量 土壤养分 黄土丘陵区 陕北 

分 类 号：S792.27[农业科学—林木遗传育种]