土地利用和土地覆被变化对土壤有机碳密度及碳储量变化的影响——以黑龙江省大庆市为例  

Effects of Land Use and Land Cover Change on Soil Organic Carbon Density and Carbon Storage--A Case Study of Daqing,Heilongjiang Province

作　　者：王晓[1] 于兵[1] 李继红[1] Wang Xiao;Yu Bing;Li Jihong(Northeast Forestry University,Harbin 150040,P.R.China)

机构地区：[1]东北林业大学,哈尔滨150040

出　　处：《东北林业大学学报》2021年第11期76-83,共8页Journal of Northeast Forestry University

基　　金：国家自然科学基金面上项目(32071838)。

摘　　要：以2019年为研究时间结束节点,分别以10 a的短期时间间隔、35 a的较长期时间间隔,通过遥感影像获取1984、2009、2019年大庆地区不同土地类型变化数据;利用多种参数定量分析不同时间尺度土地利用和土地覆被变化的强度和方向,结合野外实地取样分析得到土壤有机碳的数据;运用地理探测器与地理信息系统的空间分析,选取8种不同的自然因素和社会因素,分析研究区土壤有机碳储量变化的各影响因素之间关系。结果表明:①土地利用和土地覆被,因不同时间尺度变化的强度和方向而有显著不同,不同土地利用和土地覆被之间流动方向是复杂的过程。②研究区的土壤有机碳,经历了由减少到回升的变化趋势;经单因素方差分析,0~20 cm土壤有机碳质量分数与土地利用和土地覆被类型有显著性差异,表层土的有机碳更容易受到土地利用和土地覆被变化的影响;土壤有机碳密度变化速率和方向,因时间尺度不同有所区别。③1984—2019年土壤有机碳储量减少了1.19×10^(10) kg,但2009—2019年土壤有机碳储量增加了8.06×10^(9)kg;各影响因素比较复杂地交互作用于土壤有机碳储量变化中。Taking 2019 as the end node of the study,the change data of different land types in Daqing region in 1984,2009 and 2019 were obtained by remote sensing images with a short-term time interval of 10 years and a long-term time interval of 35 years,respectively.The intensity and direction of land use and land cover change at different time scales were quantitatively analyzed by using multiple parameters,and soil organic carbon data were obtained by field sampling analysis.Eight different natural and social factors were selected to analyze the relationship among the influencing factors of soil organic carbon storage in the study area by using geographic detectors and GIS spatial analysis.The results show that:(1)The intensity and direction of land use and land cover change are significantly different at different time scales,and the flow direction between different land use and land cover is a complex process.(2)Soil organic carbon in the study area experienced a change trend from decreasing to rising;According to one-way ANOVA,soil organic carbon content in 0-20 cm was significantly different from land use and land cover type,and surface soil organic carbon was more susceptible to land use and land cover change.The change rate and direction of soil organic carbon density vary with time scale.(3)Soil organic carbon storage decreased by 1.19×10^(10) kg from 1984 to 2019,but increased by 8.06×10^(9)kg from 2009 to 2019.All the influencing factors interact with soil organic carbon storage in a complex way.

关 键 词：土地利用 土地覆被 土壤有机碳密度 土壤有机碳储量 

分 类 号：S153.6[农业科学—土壤学]