关键词: 根际微生态系统, 豆科植物, 根瘤菌, 共生固氮, 可持续农业

Abstract: Symbiotic nitrogen fixation has long been a component of many farming systems throughout theworld and also is a primary source of N for agriculture. Because the excessive application of fertilizer-Nbrings up environmental pollution and nonrenewable resources exhaust, international emphasis on environ-mentally sustainable development with the use of renewable resources is likely to focus attention on the po-tential role of BNF in supplying N for agriculture. This paper reviews the role of symbiotic nitrogen fixationin the rotational and intercropping farm system and discusses the mechanism.