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cje ›› 1987, Vol. ›› Issue (4): 14-18.

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Seasonal Changes and Distributions of Nitrogen in Leymus Chinensis-soil system

Hu Tianming1, Zhu Tingcheng2   

  1. 1. Northwest Agricultural University;
    2. Northest Normal University
  • Received:1986-12-21 Online:1987-08-10

Abstract: This study was carried out in a natural grassland dominated by Leymus chinensis during 1983—1984.The total N content of the system was 540.75 gm-2,the most of which(98%)was presentin the soil.The soil layer of 0—15cm contained 50% of the total N.There were no significantchanges in soil-N over the growing season(May—October,p=0.005).The nitrogen reserve inroots showed a“T”-pattern in distribution and decreased exponentially with soil depth,andhad a tendency to accumulate at soil surface with time.The aboveground parts of LeymusChinesis contained only 0.16% of the total N in the system(540.75gm-2).The ratio of below-ground to aboveground part was 5.55:1 in terms of nitrogen reserve.The minimum of ratioappeared in August.The proper time to fertilize and cut the grasses was suggested.

Key words: Main urban road, Landscape pattern, Dynamic, Southwestern Shanghai