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Impacts of nitrogen application and legume-grass mixed planting on grassland community and soil respiration.

TANG Xue-juan1, XU Li-jun1, PANG Huan-cheng1, YANG Yun-hui1, WANG Di1, LI Da1, BAI Ke-yu1,2*   

  1. (1Institute of Agricultural Resources and RegionalPlanning, Chinese Academy of Agricultural Science, Beijing 100081, China; 2BiodiversityInternational East Asia Office, Beijing 100081, China).
     
  • Online:2018-03-10 Published:2018-03-10

Abstract: Legumegrass mixed planting is an important way to improve conservation and useefficiency of water and soil resources, restore degraded land, and maintain soil health. Five types of pastures (Medicago sativa, Bromus inermis,Leymus chinensis, M. sativa and B. inermis mixed planting, andM. sativa and L. chinensis mixed planting) were established in HulunbuirGrassland Station, with different nitrogen fertilization levels being applied. Aboveground biomass,photosynthetic characteristics and soil respiration were measured, aiming to understand the impacts of nitrogen application and legumegrass mixed planting on the characteristics of grassland community and the dynamics of soil respiration and thus provide theoretical basis for pastureestablishment and optimal utilization in eastern Inner Mongolia. Results showed that mixed planting did notsignificantly increase the total biomass of pasture as expected under drought condition. The netphotosynthetic rate (Pn) of the three species was in the order of:M. sativa <B. inermis<L. chinensis. Mixed sowing with alfalfa significantly improved the Pn of grasses. Nitrogen application increased the soil respiration intensity under each planting type. Moreover, mixing with alfalfa improved soil respiration intensity, with perk values occurring at 10:00-12:00.

Key words: nitrogen leaching, economic benefit, rice-rape rotation system, one-off fertilization