農牧交錯區退耕還林地土壤恢復特征的研究-以內蒙古卓資縣為例

摘要： 以卓資縣退耕還林地為研究對象,探討不同退耕還林地土壤理化性質的變化規律及改良作用.初步研究結果表明:退耕還林以后土壤黏粒總體含量均高于耕地,其中表土層增加不顯著,亞表層、下層增加較多;在不同的退耕還林地中,表層土壤容重明顯高于亞表層和下層的土壤容重;不同退耕還林模式下土壤有機質含量均隨土層深度增加而遞減,表現出明顯的表聚性;不同林地類型之間的全量N、P、K的含量變化差異顯著,而不同土層深度的全量P、K的差異不顯著;不同退耕林地的速效N、P、K的含量變化幅度較大.總體來看當地實施退耕還林后,對土壤的改良效果明顯,有效的改善了當地生態環境. Abstract： This paper studies the soil of conversion cropland to forest in Zhuozi county, exploring the law of change in the nature of the soil physical and chemical properties and the role of improvement to soil in different farmland to forests. Preliminary findings show that the soil clay contents were generally higher than those of cultivated land after returning farmland to forest, of whieh no significant increase in surface soil,sub-surface, middle and lower classes increased considerably. Returning farmland to forest in different places, the surface soil bulk density was significantly higher than sub-surface and lower soil bulk density.Different modes returning farmland to forest soil organic matter levels were decreasing with the increase in soil depth and showing a clear table cohesion. The change of entire amount of N, P, K content was significantly between the different forest types, while the entire amount of P, K of soil of different depth was not significant. The rangeability of content to quick N, P, K in different returning farmland to forest land was relatively large. Overall, it was obvious effects of soil improvement, and effectively improve the local ecological environment after implementation of the returning farmland to forests in the local. 作 者： 王同順    郭建英    孫保平    李錦榮    WANG Tong-shun    GUO Jian-ying    SUN Bao-ping    LI Jin-rong   作者單位： 北京林業大學,水土保持學院,北京,100083  期 刊： 水土保持研究  ISTICPKU   Journal： RESEARCH OF SOIL AND WATER CONSERVATION  年，卷(期)： 2009, 16(6)  分類號： X171.1 S153  關鍵詞： 農牧交錯區    退耕還林    土壤理化性質    卓資縣    Keywords： farming-pastoral zone    mandatory conversion of marginal farmland to forestland    soil physical and chemical properties    Zhuozi county   

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