黄土高原不同人工生态林对土壤主要营养元素的影响  

Impact of Different Artificial Ecological Forests on Soil Nutrients in Loess Plateau

作　　者：张楠阳[1] 张景群[1] 杨玉霞[1] 王蕾[1] 王晓芳[1] 李年麒[1] 

机构地区：[1]西北农林科技大学,杨凌712100

出　　处：《东北林业大学学报》2009年第11期74-76,共3页Journal of Northeast Forestry University

基　　金：陕西省林业厅国际合作项目<日元贷款陕西省植树造林生态环境监测>(14220302)资助

摘　　要：以黄土高原地区典型流域人工生态林为研究对象,以土壤有机质和主要营养元素的理化特性为评价指标,研究了不同人工生态林对林地土壤营养元素含量的影响。结果表明,造林后侧柏幼龄林有机碳、全氮和水解氮质量分数均下降,降低率分别为45.73%、30.00%和34.57%,全磷、全钾质量分数分别降低了4.41%和5.61%,但磷、钾的速效成分较先前提高了96.04%和10.71%;刺槐幼龄林0<土壤深度h≤10 cm有机碳质量分数有明显的上升,10 cm<h≤80 cm变化均不明显,但0<h≤80 cm总体降低了4.96%,全氮和水解氮质量分数分别降低18.33%和36.31%,全磷、全钾质量分数几乎无变化,但磷、钾的速效成分较先前分别提高了80.77%和12.28%。可见,8年生的刺槐和侧柏对土壤营养元素都有不同程度的影响,其中侧柏林对土壤营养元素的重组效应优于刺槐林。An experiment was conducted to study the effects of different artificial ecological forests on soil nutrients using typical artificial ecological forests in Loess Plateau Watershed as research object and physical and chemical properties of soil or- ganic matter and major nutrient elements as evaluation indexes. Results showed that after afforestation, for Platycladus ori- entalis forest, the contents of organic carbon, total nitrogen, hydrolytic nitrogen, total phosphorus and total potassium all decreased by 45.73%, 30.00%, 34.57%, 4.41% and 5.61%, while available phosphorus and available potassium increased by 96.04% and 10.71% compared with their corresponding contents before afforestation. For Robinia pseudoacacia forest, the content of organic carbon exhibited a visible rise in 0 ~ 10 cm soil layer and little changes in soil depth of 10 ~ 80 cm, but the content of organic carbon reduced 4.96% in soil depth of 0 ~ 80 cm, contents of total nitrogen and hydrolytic nitrogen decreased by 18.33% and 36.31%, and contents of total phosphorus and total potassium changed little, while available phosphorus and available potassium increased by 80.77% and 12.28% compared with their corresponding contents before afforestation. It is obvious that 8-year-old R. pseudoacacia and P. orientalis have various effects on soil nu- trients, and the reorganization effect of P. orientalis forest on soil nutrients is superior to that of R. pseudoacacia forest.

关 键 词：黄土高原 人工生态林 土壤 营养元素 

分 类 号：S714.5[农业科学—林学]