豆科作物轮作强化农田生态系统功能的研究进展  

Research progress on the intensification of agroecosystem functions through legume-based crop rotation

作　　者：刘春燕 张利影 周杰 许依 杨亚东 曾昭海 臧华栋 LIU Chun-Yan;ZHANG Li-Ying;ZHOU Jie;XU Yi;YANG Ya-Dong;ZENG Zhao-Hai;ZANGHua-Dong(College of Agronomy and Biotechnology,China Agricultural University/Key Laboratory of Farming System,Ministry of Agriculture and Rural Affairs,Beijing 100193,China;College of Agriculture,Nanjing Agricultural University,Nanjing 215000,Jiangsu,China)

机构地区：[1]中国农业大学农学院/农业农村部农作制度重点实验室,北京100193 [2]南京农业大学农学院,江苏南京215000

出　　处：《作物学报》2024年第8期1885-1895,共11页Acta Agronomica Sinica

基　　金：国家重点研发计划项目(2022YFD1901100);国家自然科学基金项目(32101850,422073880)资助。

摘　　要：集约化农业对保障国家粮食安全至关重要,但其导致的生态环境代价与绿色可持续发展之间的矛盾日益突出。引入豆科作物到农田生态系统对于实现地力保育、作物丰产稳产和资源优化利用等多目标协同具有重要意义。本文系统总结了豆科作物轮作对作物生产和土壤功能的主要影响:1)豆科作物通过生物固氮、高质量的根际分泌物输入、秸秆还田等过程改善了土壤氮素水平,产生正向的残留效应,有利于后茬作物增产,且增产效应在低产区更显著;2)豆科作物轮作可以通过氮肥减施降低系统N_(2)O排放,但豆科的生物固氮过程有增加CO_(2)排放的风险;3)低C/N、高氮含量的豆科秸秆还田能够提高土壤微生物活性和残体积累,提高土壤固碳效率,但其固碳效应也受到较低的秸秆生物量投入限制;4)豆科作物可以提高后茬作物的水肥利用效率,同时利用前后茬作物根系深浅合理搭配,实现轮作周年水肥高效利用。因此,将豆科作物引入到轮作系统可实现氮肥减施和增产,但其产生的土壤固碳和温室气体减排效应受到作物种类、肥料投入、土壤和气候条件等多种因素的综合影响。为更好地发挥豆科作物轮作优势,应深入探究豆科促进后茬作物增产和驱动地下部生态功能提升的耦合机制,开发豆科作物轮作配套田间管理技术,并定向设计适合我国典型生态区的新型生态高效种植体系,对推动豆科作物轮作模式构建与应用及农业绿色发展具有重要理论意义和实践价值。Although intensive agriculture plays a crucial role in ensuring global food security,the conflict between its environmental costs and sustainable development is becoming increasingly prominent.Legume inclusion into agroecosystem is vital for improving soil health,enhancing agroecosystem stability,and achieving resource utilization efficiency.This paper provides a systematic summary of the main effects of the legume-based rotation on crop production and soil function as follows:1)Legume enhance soil nitrogen(N)content through biological N fixation,high-quality rhizosphere exudates input,and straw incorporation,resulting in positive legacy effects.This,in turn,benefits the subsequent crop yields,particularly in agroecosystems with low soil fertility.2)Although the biological N fixation of legumes poses the risk of increasing CO_(2) emissions,it can mitigate greenhouse gas emissions by reducing N fertilization in the rotation.3)The low C/N ratio and high N content of legume straw promote soil microbial activity and microbial residue accumulation,thereby improving soil carbon sequestration efficiency.However,the limited amount of straw for legumes restricts C sequestration.4)Legumes can improve water and fertilizer utilization efficiency of subsequent crops,and optimizing the root depth between legume and subsequent crop can enhance the overall efficiency of water and fertilizer usage in the rotation.In conclusion,the inclusion of legumes in crop rotation can achieve a reduction in N fertilizer usage and an increase in yield.However,the effects of soil carbon sequestration and greenhouse gas emission reduction are influenced by various factors such as crop type,fertilizer input,soil,and climate conditions.Exploring the coupling mechanisms between the effects of legumes on subsequent crop yield and belowground ecological functions is of great significance.Developing field management technologies for legume-based crop rotation and designing new ecological and efficient cropping systems suitable for various regions in C

关 键 词：谷物豆科 豆禾轮作 作物生产力 土壤功能 经济效益 

分 类 号：S344.1[农业科学—作物栽培与耕作技术]