摘要
土壤圈中氮循环是全球生物地球化学循环的重要组成部分,研究土壤中氮密度、氮储量及其空间分布对整个陆地生态系统有着重要的作用.本文基于重庆市土壤普查所涉及的1411个剖面资料,辅以重庆市土壤图,行政区划图和土地利用图的基础上,对重庆市氮密度与氮储量的特征进行了研究.研究结果表明:重庆市土壤氮密度分布不均,0—20cm与0—100cm深度土壤氮密度平均值分别为0.26kg/m2和0.87kg/m2,均低于全国平均水平;而0—20cm与0—100cm深度土壤氮库分别为210.32×108kg和714.10×108kg.重庆市氮密度和氮储量的空间分布受到土壤类型,土地利用方式,地理环境,人类活动的影响.整体而言,重庆市内东北和东南部区域的土壤氮密度相对较高.
Nitrogen cycle in pedosphere plays an important role in determining biogeochemistry cycle,so it is important to study the characteristics of nitrogen pool.The study,based on 1411 soil profiles,soil map,land use map,and district map of Chongqing,estimated the characteristics of nitrogen density and its storage.The results showed,the average nitrogen density for the soil depth of 0—20cm and 0—100cm was 0.26kg/m2 and 0.87kg/m2 respectively,both density was less than the national average amount.The nitrogen storage for the soil depth of 0—20cm and 0—100cm was 210.32×108kg and 714.10×108kg respectively.The nitrogen density and its storage varied significantly at different soil type,districts and land use.In general,the nitrogen density in the northeastern and southeastern in the Chongqing is relatively high.
出处
《应用基础与工程科学学报》
EI
CSCD
2011年第4期535-542,共8页
Journal of Basic Science and Engineering
基金
重庆市教委科技研究项目"重庆市土壤氮库特征研究(KJ080405)"
关键词
氮密度
氮储量
重庆
分布特征
nitrogen density
nitrogen storage
Chongqing
distribution
