水蚀风蚀交错区不同类型植被对土壤碳氮影响的研究  

Influence of the Different Typical Vegetation on the Soil Total Nitrogen and Organic Matter in the Wind-Water Erosion Crisscross Region,China

作　　者：刘洁[1] 刘小林 张兴昌[1] 杨宏平[3] 王少国[3] 

机构地区：[1]西北农林科技大学资源与环境学院,陕西杨凌712100 [2]陕西榆林市农业科学研究所,陕西榆林719000 [3]西北农林科技大学理学院,陕西杨凌712100

出　　处：《水土保持研究》2008年第6期53-56,共4页Research of Soil and Water Conservation

基　　金：西部之光(2006YB04);"十一五"国家科技支撑项目(2006BAD09B06);中国科学院水利部水土保持研究所领域前沿项目(SW05501)

摘　　要：植被类型对土壤养分及其物质循环具有重要作用。通过典型采样与室内分析相结合，系统研究了水蚀风蚀交错区不同典型植被对200cm土层内土壤全氮、有机质和C／N比值的影响．结果表明：（1）0—40cm内土壤全氮和有机质含量随深度增加而逐渐下降，40cm以下基本不随深度变化而变化。不同植被类型的土壤C／N比值基本不随深度变化而变化，其中裸地农田的200cm剖面土壤C／N均值最高，剖面平均为9．5，其他植被类型基本相似为6．7～7．7。0—20cm油松土壤C／N比值最高，为10．3．榆树最低，为5．99；（2）0—20cm土层内沙蒿全氮含鼍最高，约为油松、榆树、黑豆农田的1．5倍。20-40cm土层内，沙打旺最高，黑豆农田与农田裸地基本相似。总体而言，沙打旺和沙蒿200cm剖面全氮含量均高于其他植被类型，油松和榆树土壤全氮含量最低；（3）0～20cm内有机质含量沙蒿最高，榆树最低，20-40cm层次内，沙蒿的有机质含量显著降低，最高者为农田裸地，沙打旺和黑豆农田次高，油松略高于沙蒿，榆树仍为最低。从整个0—200cm土壤剖面看，裸地农田有机质含量最高，沙打旺次之。榆树在各层次有机质含量均低于其他植被类型。但油松0—20cm表层有机质含量较高说明油松可以提高表层土壤有机质含量．但对深层土壤有机质没有明显作用。This paper systematically studied the influences of the different vegetation on the soil total nitrogen （TN） and organic matter（OM） in the wind-water erosion crisscross region in China. The results show that （1） The content of TN and OM decline with the increase of the soil depth within the 0--40 cm, and become steady under the depth of 40 cm. Under the different conditon of vagetation, the value of soil C/N changes few with the depth, within the 0--200 cm depth, the averaged value of soil C/N in deserted aricultural land is the largest, and the averaged values of soil C/N fluctuate with range of 6.7--7.7. With in 0--20 cm, the value of C/N in Pinus Tabulaeformis land become the summit with 10.3, and the value is the smallest with 5.99 in the elm land. （2） The value of TN under the vegetati on of Artemisa arenaria and Astragalus adsurgens land is distinctly larger than the other vegetation, the Pinus Tabulaeformis and the elm have the smallest TN. （3） Within 0--20 cm, the soil OM in the Artemisa arenaria is the largest, and the smallest in the elm land. Within 20--40 cm, the content of OM in Arternisa arenaria land decrease greatly, however the OM in the deserted agricultural land become the peak, and then the Astragalus adsurgens, the black bean land, still the elm land has the smallest value of soil OM. Generally, within 0--200 cm, the de serted agricultural land has the largest content of soil OM, and the elm land has the smallest one. The Pinus Tabulaeforrnis can improve the OM at the shallow soil layer.

关 键 词：水蚀风蚀交错区 植被类型 全氮 有机质 

分 类 号：S153.61[农业科学—土壤学]