摘要
以1990-2015年的土地利用数据为基础,对国内外碳密度研究结果修正后运用InVEST模型Carbon模块估算太行山区的碳储量,划分碳密度在海拔、坡度、坡向、植被覆盖度和降水量上的变化梯度,并分析碳储量和碳密度在各梯度的变化规律和趋势,探讨土地利用变化对碳密度的影响.结果表明:(1)研究区碳储量和平均碳密度先增后减,25年间碳储量增加约3.73×10^(6) t,碳密度增加约0.27t·hm^(-2).(2)研究区碳密度随海拔升高呈“M”型波动式增加,随坡度变陡呈“√”型先减后增,在坡向上平均碳密度阴坡>半阴坡>半阳坡>阳坡,随植被覆盖度增加呈“U”型先减后增,随降水量增多呈“√”型波动增加后趋于平缓.(3)耕地和建设用地对中低海拔、缓坡中坡、中低降水量区域的碳密度影响较大,林地和草地则相反;林地和草地的南北坡差异导致碳密度阴阳坡差异显著;水域和建设用地主要影响低覆盖区域碳密度,耕地和草地影响中、中高覆盖区域,林地则决定高覆盖区域碳密度的大小和变化.
The temporal and spatial variation and gradient differentiation of mountain carbon storage are very important to understand the status and evolution of mountain carbon storage.However,there is a lack of comprehensive analysis and research on the spatial heterogeneity of mountain carbon storage and multi-dimensional environmental gradient change.Based on the land use data from 1990to 2015,this paper estimates the carbon storage of Taihang Mountain by carbon module of InVEST model after revising the results of carbon density research at home and abroad,divides the change gradient of carbon density in altitude,slope,aspect,vegetation coverage and precipitation,and analyzes the change rule and trend of carbon storage and carbon density in each gradient,and on this basis,discusses how land use change affects carbon storage density.The results showed that:(1)the carbon storage and average carbon density increased first and then decreased,the carbon storage increased by 3.73×10^(6) t and the carbon density increased by about 0.27t·hm^(-2) in 25years.(2)With the increase of altitude,the carbon density in the study area increased in a“M”type,and decreased first and then increased with the increase of the slope gradient.The average carbon density in the slope upward was shady slope>semi shady slope>semi sunny slope>sunny slope.With the increase of vegetation coverage,the carbon density first decreased and then increased in a“U”shape,and then increased in a“√”shape with the increase of precipitation,and then tended to be gentle.Generally speaking,the average carbon density decreased in low altitude,slope,vegetation coverage and precipitation in 25years,and increased on the contrary.(3)The results show that cultivated land and construction land have a greater impact on carbon density in areas with low altitude,slope and precipitation,while woodland and grassland have the opposite effect;the difference between the north and south slopes of woodland and grassland leads to significant difference in carbon density;water area and construction land mainly lead to low coverage area;cultivated land and grassland affect medium and high coverage area;forest land determines the size and change of carbon density in high coverage area.
作者
李茂娟
李天奇
朱文博
朱连奇
LI Maojuan;LI Tianqi;ZHU Wenbo;ZHU Lianqi(College of Geography and Environmental Science,Henan University,Henan Kaifeng 475004,China)
出处
《河南大学学报（自然科学版）》
CAS
2021年第6期631-642,684,共13页
Journal of Henan University:Natural Science
基金
国家自然科学基金资助项目(41671090)
国家重点基础研究发展计划(2015CB452702)。
