核桃-大豆间作系统细根分布及地下竞争

生态学杂志 ›› 2012, Vol. 31 ›› Issue (07): 1612-1616.

核桃-大豆间作系统细根分布及地下竞争

许华森,云雷,毕华兴^**,高路博,鲍彪

（北京林业大学水土保持学院，水土保持与荒漠化防治教育部重点实验室，北京 100083）

出版日期:2012-07-10 发布日期:2012-07-10

Fine root distribution and underground competition in walnut-soybean intercropping system.

XU Hua-sen, YUN Lei, BI Hua-xing^**, GAO Lu-bo, BAO Biao

(College of Soil and Water Conservation, Beijing Forestry University; Key Laboratory of Soil and Water Conservation & Desertification Combating, Ministry of Education, Beijing 100083, China)

Online:2012-07-10 Published:2012-07-10

摘要/Abstract

摘要： 以晋西黄土区核桃大豆间作系统为研究对象，采用分层挖掘法对核桃-大豆间作系统细根分布特征及地下竞争状况进行研究，旨在为该地区果农间作系统的高效可持续经营提供科学依据。结果表明：核桃细根在垂直方向上主要分布在0～40 cm土层内，水平方向上55.7%的细根集中分布在距树行0.5～1.5 m区域中；间作物大豆的根系在垂直方向上集中分布在0～20 cm土层内，水平方向上根干重随距树行距离的增加呈增加趋势；在水平方向上距树行1.0～2.5 m的区域是核桃和大豆地下种间竞争主要发生区，其中以1.5～2.0 m区域的竞争最为剧烈。

关键词: 秸秆还田, C/N, 土壤CO₂排放, 黑土, 土壤固碳

Abstract: The method of stratified digging was adopted to study the fine root distribution and underground competition in a walnut-soybean intercropping system in Loess Plateau of western Shanxi, Northwest China, aimed to provide scientific support for the efficient and sustainable management of fruit tree-crop intercropping system in this region. The walnut fine roots in the intercropping system were concentrated in 0-40 cm soil layer, and 55.7% of the roots were mainly distributed within the areas 0.5-1.5 m from walnut tree. Soybean fine roots were mainly distributed in 0-20 cm soil layer, and presented an increasing trend with the increasing distance from walnut tree. The underground interspecies competition between walnut and soybean mainly occurred within the areas 1.0-2.5 m from walnut tree, and was most intense within the areas 1.5-2.0 m from the tree.

Key words: straw amendment, C/N, soil CO₂ emission, black soil, soil carbon sequestration.

许华森,云雷,毕华兴**,高路博,鲍彪. 核桃-大豆间作系统细根分布及地下竞争[J]. 生态学杂志, 2012, 31(07): 1612-1616.

XU Hua-sen, YUN Lei, BI Hua-xing**, GAO Lu-bo, BAO Biao. Fine root distribution and underground competition in walnut-soybean intercropping system.[J]. cje, 2012, 31(07): 1612-1616.

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