重庆市区表层土壤有机碳密度与储量分析.docVIP

 重庆市区表层土壤有机碳密度与储量分析# 刘勇1，王成1，岳文泽2，慈恩1，罗瑾1，胡艳燕3** （1. 西南大学资源环境学院，重庆 400716； 5 10 15 2. 浙江大学土地科学与不动产研究所，杭州 310029； 3. 重庆市风景园林科学研究院，重庆 401329） 摘要：城市化使大面积的自然或耕作土壤变为城市土壤，而这一转变引起的土壤碳密度及储 量的变化，是碳循环研究值得关注的前沿问题。考虑到城市土壤碳数据缺乏的情况，本文以 重庆市区为例，首先基于高分辨率遥感影像获取城市植被分布信息，再结合 0-20cm 的表层 土壤样品有机碳数据，利用空间分析方法探讨了城市土壤碳密度与储量的分布特征。结果表 明，重庆市区表层土壤碳密度随城市扩展年限、坡度和绿地类型的不同呈现出空间分异，新 -2 -2 -2 -2 -2 -2 被覆盖下的表层土壤碳库储量为 0.375 Tg，占整个重庆市表层土壤碳库（0.273 Pg）的 0.14% 左右。加之城市不透水面增加对土壤碳库封闭的影响，估计 1994-2009 年重庆市区封闭的碳 储量约为 0.623 Tg。 关键词：土壤有机碳；城市化；植被；空间分布；重庆 中图分类号：S153.621 20 The characteristics of soil organic carbon density and storage in urban Chongqing LIU Yong1, WANG Cheng1, YUE Wenze2, CI En1, LUO Jin1, HU Yanyan3 (1. College of Resources and Environment, Southwest University, Beibei, ChongQing 400716; 25 30 35 40 45 2. Institute of Land Science and Property Management, Zhejiang University, HangZhou 310029; 3. Chongqing Institute of Landscape Gardening, Jiulongpo, ChongQing 401329) Abstract: Companying with rapid urbanization, a large amount of natural or cultivated soil has been conversed to urban soil. It is very important to study the impact of urbanization on soil organic carbon density and storage. However, lack of qualified data of urban soil makes a big challenge for researchers. So this paper attempts to find an alternative method to depict urban soil carbon, taking urban Chongqing as an example. First, we obtained the information of the vegetated areas based on interpreted results of high-resolution image. Then we analyzed the density of soil organic carbon within surface soil ranging from 0 to 20cm, through field sampling. We finally explored the spatial pattern of urban soil carbon density and storage using spatial analysis, including spatial interpolation method. We found that urban soil carbon density varies with the urbanized situation, the topography and the vegetation coverage. First, the newly grown urban area h