Effect of long-term fertilization on organic carbonassociate with soil particle-size fractions in the typical cropland of China

摘要：

Sciences /Key Laboratory of Crop Nutrition and Fertilization, Ministry of Agriculture, Beijing 100081 China ;Ming-gang Xu@Institute of Agricultural Resources and Regional Panning, Chinese Academy Agricultural Sciences /Key Laboratory of Crop Nutrition and Fertilization, Ministry of Agriculture, Beijing 100081 China Tel. No. [phone]; Fax No. [phone]; E-mail: [e-mail];Xiujun Wang@Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20740, USA; Wenju Zhang@Institute of Agricultural Resources and Regional Panning, Chinese Academy Agricultural Sciences /Key Laboratory of Crop Nutrition and Fertilization, Ministry of Agriculture, Beijing 100081 China ; Soil samples were collected from four 17 years longterm arable field experiments in Qiyang, Zhengzhou, Urumchi and Gongzhuling of China respectively (Red soil, Fluvo-aquic Soil, Grey desert soil and Black soil). Each sample was separated into sand (S 53-2 000μm), coarse silt (CS 5-53 μm), fine silt (FS 2-5 μm), coarse clay (CC 0.2-2 urn) and fine clay (FC <0.2 μm) fractions. Compared to unfertilized field, long-term application of manure combined with chemical fertilizer (NPKM, 1.5NPKM) significantly enhanced SOC in all fractions at all sites. Moreover, SOC associated with S show the highest increases with the order Grey desert soil (397.5％) >Red soil (277.3％)>Fluvo-aquic Soil (179.3％),>Black soil(149％). Application of chemical fertilization (NPK) and straw back to cropland (NPKS) mainly increased SOC in S, CS, CS and CC, and most increased SOC in S with 30.3％-105.7％. It was calculated that 25.6％ to 38.22％ of SOC associated with CC, and only 5.1％ to 15.6％ of SOC in FC, which implied CC was a great fraction to sequestrated carbon under long- term fertilization in cropland.

关键词： Long-term fertilization Soil organic carbon Particle-size fractionation Sequestration rate Red soil

作者: Xiaogang Tong Ming-gang Xu Xiujun Wang Wenju Zhang

作者单位: Institute of Agricultural Resources and Regional Panning, Chinese Academy AgriculturalSciences /Key Institute of Agricultural Resources and Regional Panning, Chinese Academy Agricultural Sciences /Key Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20740, USA

会议类型: 国际会议

会议名称: The 2nd International Workshop on Carbon Sequestration and Climate Change Mitigation in Agriculture(第二届农业土壤固碳减排与气候变化国际学术研讨会)

会议地点: 北京

会议语种:英文

页码: 29-30

在线出版日期: 2010-06-27（万方平台首次上网日期，不代表论文的发表时间）