%0 Journal Article %A CHEN Shu-xin1 %A WANG Guo-bing1 %A RUAN Hong-hua1** %A YUE Zhen1 %A XU Chang-bai2 %A XU Ya-ming2 %T Seasonal variations of soil nitrogen mineralization under different land-use types in a coastal area in northern Jiangsu, China. %D 2014 %R %J Chinese Journal of Ecology %P 276-282 %V 33 %N 2 %X 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. %U http://www.cje.net.cn/EN/abstract/article_21299.shtml