摘要
耕作方式通过影响土壤微生物群落而影响土壤生态系统过程。本研究以传统耕作玉米连作处理为对照,通过测定土壤微生物量碳及磷脂脂肪酸含量,分析了保护性耕作(包括免耕玉米连作和免耕大豆-玉米轮作)对黑土微生物群落的影响。结果表明,保护性耕作可显著增加土壤表层(0～5cm)全碳、全氮、水溶性有机碳、碱解氮和微生物量碳(P<0.05),为微生物代谢提供了丰富的资源。同时,保护性耕作显著提高了土壤表层(0～5cm)总脂肪酸量、真菌和细菌生物量(P<0.05),提高了土壤的真菌/细菌值,有利于农田土壤生态系统的稳定性。研究结果对于探讨保护性耕作的内在机制具有重要意义。
Tillage systems affect soil microbial communities,which in turn influence soil ecological processes.In this study,the effects of conservation tillage （including no-tillage continuous corn and no-tillage soybean-corn rotation） on microbial community were studied by determining the contents of soil microbial biomass carbon and phospholipid fatty acids （PLFAs） and comparing it with conventional tillage continuous corn.Results show that implementation of conservation tillage significantly increases soil carbon and nitrogen,water soluble organic carbon,available nitrogen and microbial biomass C in the 0～5 cm soil depth （P0.05） compared with conventional tillage.These conditions produce abundant substrate for microbial growth.Furthermore,conservation tillage practices increase total PLFAs,fungal and bacterial biomass in the surface layer,increase fungi/bacteria ratio,and thus improve soil sustainability.These findings are of great significance for understanding the internal mechanisms of conservation tillage.
出处
《中国生态农业学报》
CAS
CSCD
北大核心
2010年第1期83-88,共6页
Chinese Journal of Eco-Agriculture
基金
国家自然科学基金重点项目(40535028)
国家科技支撑计划项目(2007BAD89B02
2006BAD15B01)
中国科学院沈阳应用生态研究所海外留学基金项目(07HWLX11S4)资助
关键词
保护性耕作
微生物量碳
磷脂脂肪酸
微生物群落
黑土
Conservation tillage
Microbial biomass carbon
Phospholipid fatty acids
Microbial community
Mollisol
