文献类型：期刊文献

中文题名：半干旱区土壤有机碳密度遥感估算

英文题名：Estimation of Soil Organic Carbon Density in Semi-arid Area by Remote Sensing

作者：王燕[1] 高志海[1] 孙斌[1] 李长龙[1] 宋张亮[1]

第一作者：王燕

机构：[1]中国林业科学研究院资源信息研究所

年份：2019

卷号：34

期号：5

起止页码：103-112

中文期刊名：遥感信息

外文期刊名：Remote Sensing Information

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：中央级公益性科研院所基本科研业务费专项资助（CAFYBB2018SY021）;国家科技支撑计划课题（JYZJ201712）

语种：中文

中文关键词：SOCD;半干旱区;MODIS;NPP;土壤基础呼吸

外文关键词：SOCD;semi-arid area;MODIS;NPP;soil basal respiration

分类号：P951

摘要：定量估算半干旱区土壤有机碳密度(soilorgani ccarbon density,SOCD)及空间分布规律对了解该区域的土壤碳收支情况具有重要意义。该研究基于陆地碳循环平衡原理,结合2012—2016年MODIS数据和CASA模型估算了浑善达克沙地及其周边地区的年均NPP和年均土壤基础呼吸,将年均NPP与年均土壤基础呼吸分别与实测SOCD进行相关性分析,构建最优的SOCD估算模型。结果表明,研究区土壤表层(0~10cm)平均SOCD约为1.68kgC/m^2,SOCD介于0.5~6.61kgC/m2之间;SOCD具有高度的空间变异性,由西至东逐渐增大,东部稀疏林地以及灌木林区域SOCD较高,西部荒漠草原地区SOCD较低。研究发现,SOCD与植被、人类生产活动以及气候特征密切相关。
Quantitative estimation of soil organic carbon density(SOCD)and analysis of its spatial distribution in semi-arid area are important for understanding the soil carbon budget in the region.Based on the principle of terrestrial carbon cycle balance, in our study, MODIS data from 2012 to 2016 and CASA model were used to estimate the average annual NPP and annual average soil basal respiration in Otindag sandy land and its surrounding areas.Based on the correlation analysis between the average annual NPP, the annual soil basic respiration and the measured SOCD, the optimal SOCD estimation model was constructed.The results showed that, the average SOCD at depth of 10 cm was approximately 1.68 kg C/m^2 , and the SOCD ranged from 0.5 to 6.61 kg C/m^2 .The SOCD varied significantly at different districts, and it increased from west to east gradually.The SOCD in the eastern sparse woodland and shrubland was higher than that in the western desert steppe.Meanwhile, it was found that the SOCD was closely related to vegetation, human activities and climate.