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Seasonal variations of soil nitrogen mineralization under different land-use types in a coastal area in northern Jiangsu, China.

CHEN Shu-xin1, WANG Guo-bing1, RUAN Hong-hua1**, YUE Zhen1, XU Chang-bai2, XU Ya-ming2   

  1. (1Jiangsu Key Laboratory of Forestry and Ecological Engineering, Nanjing Forestry University, Nanjing 210037, China; 2State Forest Farm of Dongtai City, Jiangsu Province, Dongtai 224200, Jiangsu, China)
  • Online:2014-02-10 Published:2014-02-10

Abstract: The variations of soil mineral N under four different land use types (i.e. poplar plantation, crop-poplar integrated system, grassland, and cropland) in a coastal area of northern Jiangsu were investigated by a closetop incubation method. The net N mineralization rate under each of the four land use types was higher in spring than in autumn, winter and summer. The net N mineralization rate decreased in order of poplar plantation, crop-poplar integrated system, cropland and grassland. Ammonium N and nitrate N showed obvious seasonal variations under the four land use types. The concentrations of ammonium N and nitrate N were generally higher in spring than in other three seasons. The soil mineral N decreased with increasing soil depth. In 10-25 cm soil layer, the soil mineral N concentration was significantly different between poplar plantation and croppoplar integrated system. In poplar plantation and grassland, the soil mineral N concentration was significantly different between 25-40 and 0-10, 10-25 cm soil layers. The concentration of soil mineral N was significantly higher in poplar plantation than in cropland and grassland in 0-10 cm soil layer.

Key words: spectral recognition mode., remote sensing, black and odorous, urban water body