农业环境科学学报2012，Vol.31Issue(9)：1854-1861,8.
长期施肥对稻田土壤活性有机碳和氮的影响
Effect of Long-term Fertilization on Active Organic Carbon and Nitrogen in Paddy Soils
摘要
Abstract
Soil active organic carbon and nitrogen play important roles in soil carbon and nitrogen cycle as the most active parts of soil organic carbon and nitrogen. Soil microbial biomass carbon(MBC) and microbial biomass nitrogen(MBN), dissolved organic carbon(DOC) and dissolved organic nitrogen(DON) were measured to investigate the effects of long-term fertilization on active soil organic carbon(MBC+DOC) and nitrogen(MBN+DON) from three long-term field experiments (Taoyuan, Ningxiang and Taojiang) in Hunan Province, China. Results showed that chemical fertilizer or combined with organic manure applications increased the contents of soil active organic carbon and nitrogen, as compared to non-fertilizer treatments. The applications of chemical fertilizer increased active soil organic carbon and nitrogen contents by 3.3%~21.0% and 3.3%~27.1%, respectively. Similarly, the applications of organic manure increased active soil organic carbon and nitrogen contents by 48.7%~84.8% and 17.9%~ 105.8%, respectively. Furthermore positive correlation between the active soil organic carbon and nitrogen contents and organic fertilizer application amounts were found in all the three sites. The contents of active soil organic carbon between three sites followed the track of Taoyuan>Ningxiang>Taojiang. The correlations relationship between active soil organic carbon contents and soil organic carbon accumulation rates was significantly positive (P<0.05), while correlation relationship between active soil organic carbon contents and soil organic carbon contents was insignificant. High soil clay contents at Taoyuan site could be the reason why SOC accumulation rates at Taoyuan site were higher than other sites. Although the clay contents and amounts of organic carbon input at Ningxiang and Taojiang sites were similar, the difference of SOC accumulation rates at the two sites was significant. Since high original SOC content at Tao-jiang site was a regulated factor of SOC accumulation rates. Comparable active soil organic nitrogen contents were gained at Taoyuan and Nmgxiang sites which were about 1.8 times that in Taoijang site. The significant correlation between active soil organic nitrogen contents and total nitrogen accumulated rates (P<0.01 )was found in the study.关键词
长期施肥/活性有机碳/活性有机氮/稻田土壤Key words
long-term fertilization/ active organic carbon/ active organic nitrogen/ paddy soil分类
农业科技引用本文复制引用
黄威,陈安磊,王卫,谢小立,童成立,刘守龙,苏衍涛..长期施肥对稻田土壤活性有机碳和氮的影响[J].农业环境科学学报,2012,31(9):1854-1861,8.基金项目
公益性行业(农业)科研专项经费项目(201203030) （农业）
国家自然科学基金项目(31200339) （31200339）
中国科学院战略性先导科技专项——应对气候变化的碳收支认证及相关问题(XDA05050505) （XDA05050505）
