生态环境学报2011，Vol.20Issue(3)：409-414,6.
耕作方式对华北冬小麦田土壤微生物生物量碳分布特征的影响
Influences of tillage practices on distribution of soil microbial biomass carbon under winter wheat in north China
摘要
Abstract
Soil microbial biomass carbon (SMBC), an important indicator of soil fertility, is closely related to soil organic carbon (SOC) content. A field experiment was conducted to characterize the influences of tillage practices on SMBC. The study was established at the Luancheng Agro-Ecosystem Experimental Station in 2001 with three tillage practices under winter wheat: conventional tillage (CT), rotary tillage (RT), and no-tillage (NT). Soil samples were collected in the 2007-2008 crop seasons and fumigation-extraction method was used to measure SMBC under the tillage treatments. In winter wheat growing period, SMBC showed significant temporal and spatial variations. The peaks of SMBC were observed at the re-greening and blooming stages. SMBC content decreased with increasing soil depth. The highest and lowest SMBC values in the 0 ～ 5 cm appeared in the NT and CT treatments, respectively. In the 5 ～ 10 cm soil layer, the RT and CT treatments had equivalent SMBC contents, which were greater than that of the NT treatment. In the 10 ～ 20 cm soil layer, the highest and lowest SMBC values appeared in the CT and NT treatments,respectively. At soil depth greater than 20 cm, each treatment had low SMBC values. Significant SMBC stratification was observed under NT in the 0 ～ 30 layer. On the other hand, homogeneous SMBC concentration appeared in the 0 ～ 10 cm layer under RT and in the 0 ～ 20 cm layer under CT. SMBC concentration in the soil profile was closely related to soil organic carbon content, and soil temperature and water content were the nain environmental factors influencing the temporal changes of SMBC.关键词
免耕/土壤微生物生物量碳/土壤含水量/土壤温度/土壤有机碳/层化率Key words
no tillage/ soil microbial biomass carbon/ soil water content/ soil temperature/ soil organic carbon/ stratification ratio分类
农业科技引用本文复制引用
张明园,黄光辉,孔凡磊,陈阜,张海林..耕作方式对华北冬小麦田土壤微生物生物量碳分布特征的影响[J].生态环境学报,2011,20(3):409-414,6.基金项目
公益性行业(农业)科研专项(200903003 （农业）
201103001) （）
