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苏北沿海不同土地利用方式土壤氮矿化季节变化特征

陈书信1,王国兵1,阮宏华1**,岳臻1,徐长柏2,徐亚明2   

  1. (1南京林业大学江苏省林业生态工程重点实验室, 南京 210037; 2江苏省东台市国营林场, 江苏东台 224200)
  • 出版日期:2014-02-10 发布日期:2014-02-10

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

摘要: 以苏北沿海地区杨树林、杨农复合、草地和农田等4种不同土地利用方式为研究对象,采用原位封顶法测定了其土壤矿质氮含量及其季节动态。结果表明:土壤氮矿化速率季节变化显著,最大值出现在春季。不同土地利用方式土壤净矿化速率表现为杨树林>杨农复合>农田>草地。不同土地利用方式土壤NH4+-N、NO3--N含量均表现出显著的季节变化,土壤NH4+-N、NO3--N含量最大值均出现在春季。土壤氮矿化随土层深度的增加而降低,土壤矿质氮含量随季节与土层深度变化。在10~25 cm土层,杨树林土壤矿质氮含量与杨农复合之间差异显著(P<0.05);杨树林和草地土壤矿质氮含量在25~40 cm土层与0~10、10~25 cm土层之间差异显著(P<0.05)。在春季表层土壤中,杨树林土壤矿质氮含量与农田、草地的差异较为显著,杨树林显著高于农田、草地(P<0.05)。

关键词: 城市水体, 黑臭, 遥感, 光谱识别模型

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