植物营养与肥料学报2010,16(3)：642-649 Plant Nutrition and Fertilizer Science
保护性耕作对土壤微团聚体碳、氮分布的影响
王彩霞，舌西杰，葛玺祖，黄婷，王勇，王旭东”
（西北农林科技大学资源环境学院，陕西杨凌712100）
摘要：以7年不同耕作的定位试验为研究对象，研究了深松、耕、免耕等保护性耕作对关中楼土小麦-玉米轮作条件下微闭象体分布以及微闭案体中有机碳和全氮含量的影响。结果表明，秸秆粉碎旋耕、秸秆覆盖深松处理提高了特征微闭聚体的组成比例，面精杆还田+传统耕作和免耕处理对特征微困案组成比例的影响较小。与传统耕作比较，旋耕、深松处理均能提高较大粒级微团聚体中(0.05~0.25mm和0.01~0.05mm)有机碳及全氮含量，而免耕使0.01~0.05mm微闭聚体中的有机碳和全氮含有所降低：旋耕、深松和免耕对小粒级微团聚体（<0.01mm)中的有机碳和全氮含量影响较小。相关分析表明，土有机碳与0.05~0.25mm和0.01~0.05mm粒缓微团聚体中的有机碳、全氮之间均显差正相关，而与<0.01mm粒级微团案体的有机碳、全氮含量不相关：土壤全鼠与0.05。 0.25mm粒级的全氮、有机碳显著相关。0.01~0.05mm粒级微团聚体的碳.氮与0.05~0.25mm粒级微团案体的碳、氮间显著正相关，面<0.01mm粒级微闭聚体的碳、氮与其它粒级的碳、氮间不相关。从土壤微团案体中碳、氮
的分布考虑，旋耕、深松是当地较理想的耕作方式。关键调：保护性耕作；微团案体；碳、氮分布
中图分类号：S153.6*1；S343
文献标识码：A
文章编号：1008505X(2010)03-0642-08
Effectsof conservational tillagemeasuresondistributionsof
organiccarbonandnitrogeninsoilmicroaggregates WANC Cai-xia, YUE Xi-jie, GE Xi-zu, HUANG Ting, WANC Yong, WANG Xu-dong
(College of Resources and Ensironmenz Sciences, Northwest Agricultural and Forestry Unitersity, Yangling, Shaani 712100, Chin)
Abstract: A seven year location experiment in the condition of wheat-com rotation of Lou soil in Guanzhong plain was conducted. The effects of the subsoiling, rotary tillage and no-tillage on the distributions of micro-aggregates and the con tents of organic carbon and nitrogen in soil micro-aggregates were studied. The results show that the compositional propor tions of soil characteristic micro-aggregates are increased under the rotary tillage with straw pulverizing and the subsoiling with straw mulching, while there are liutle effects on the proportion under the conventional tillage (plow and rolary tillage) with straw incorporated and no-tillage. Compared with the conventional tillage, the subsoiling and rotary tillage could increase the contents of organic carbon and nitrogen in 0.05 0.25 mm and 0.01 -0.05 mm micro-aggregates, and the no-tillage could decrease the contents of organic carbon and nitrogeni in 0.01 -0.05 mm micro-aggregales. The rotary tillage, subsoiling and no-tillage have little effects on the contents of organic carbon and nitrogen in < O.O1 mm micro aggregates, The correlation analysis demonstrates that the total soil organic carbon is related to the contents of organic car-bon and nitrogen in 0.05 0.25 mm and 0.01 0.05 mm micro-aggregates and is not related to the contents of organic carbon and nitrogen in < O.01 mm micro-aggregates. Total nitrogen in soil is significantly correlated to the contents of or-ganic carbon and nitrogen in 0.050.25 mm micro-aggregates. The contents of organic carbon and nitrogen in 0.01 O.05 mm micro-aggregates are significantly correlated to soil total nitrogen.The contents of organic carbon and nitrogen in < 0.01 mm micro-aggregate are not correlated to those of the other sized micro-aggregales, Considering the distributions
收稿日期：20090609
接受日期：20090903
基金项目：国家科技支撑项目(2007BAD89B16)；中国科学院知识创新工程项月（KSCX1-YW-09-07)资助。
作者简介：王彩霞（1984—），女，甘肃张披人，硕士研究生，主要从事土壤与环境化学研充。E-mil：wcs-1.0@163.com
通讯作者E-mail：wangxudong01@126.com 万方数据