Abstract: Legume-Gramineae intercropping system, as a model of sustainable agricultural development, plays an important role in ensuring grain yield and maintaining nitrogen balance, leading to the widespread concern by the scientists at home and abroad. This paper reviewed the effects of legume-Gramineae intercropping on the legume nitrogen fixation, crop nitrogen uptake, and soil nitrogen balance. Rational legume-Gramineae intercropping can promote the legume biological nitrogen fixation, improve Gramineae crop nitrogen use efficiency, reduce soil nitrogen loss, and benefit the protection of cropland ecological environment and the maintenance of agricultural sustainable development. In order to further use and improve the legume-Gramineae intercropping system, it was suggested that more attentions should be paid on the changes of rhizosphere microbial community structure and the interactions among crop, rhizosphere microorganisms, and soil.

Key words: UV, Ulva prolifera, photosynthesis., SA