贵州省退耕还林(草)时空格局及其固碳效应  

Spatial-temporal Pattern of the“Grain-for-Green Project”and Its Carbon Sequestration Effect in Guizhou Province

作　　者：邰良 陈佳[1] 龙文涛 蔡华银 王欣星 TAI Liang;CHEN Jia;LONG Wentao;CAI Huayin;WANG Xinxing(College of Agriculture,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学农学院,贵阳550025

出　　处：《水土保持学报》2024年第6期170-177,共8页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(42367047);贵州大学博士基金项目(2021042)。

摘　　要：[目的]为探究退耕还林(草)工程对贵州省陆地生态系统碳储量的影响。[方法]以贵州省为例,利用ArcGIS与InVEST模型相结合,研究2000—2020年贵州省退耕还林(草)时空分布格局及碳储量变化。[结果](1)2000—2020年贵州省土地利用变化显著,综合动态度呈先下降后上升的趋势,依次为0.32%,0.11%,0.09%,0.35%。耕地、林地和草地之间相互转换,建设用地与水域主要来源于耕地。(2)2000—2020年退耕还林(草)总面积为238.17万hm^(2),土地利用转型主要以耕地转向林地为主,占总退耕还林(草)总面积的84.86%,主要分布在遵义市、毕节市和黔西南州等地。(3)2000—2020年退耕还林(草)区的碳储量共增加257.40×10^(6)t,呈逐渐增长的趋势。耕地转向林地的固碳量最大,达239.89×10^(6)t(93.2%),土壤碳库为主要贡献者,碳储量为178.15×10^(6)t(69.21%)。[结论]实施退耕还林(草)工程有助于提高区域生态系统碳储量,耕地转向林地的固碳能力最大,耕地转向草地的固碳能力较小,在未来实施退耕还林(草)工程可优先考虑耕地退耕成林地,有助于提高区域碳储量。[Objective]To analyze the impacts of the“Grain-for-Green Project”on the ecosystem carbon stocks in Guizhou Province.[Methods]Taking Guizhou Province as an example,the spatial and temporal distribution pattern and carbon stock changes of the“Grain-for-Green Project”in Guizhou Province from^(2)000 to 2020 were investigated by using ArcGIS in combination with the InVEST model.[Results](1)During the 20-year period,land use in Guizhou Province had changed significantly,and the comprehensive dynamic had shown a downward and then an upward trend,which was 0.32%,0.11%,0.09%,0.35%in order.There was an interconversion among cropland,woodland and grassland,with built-up land and waters mainly derived from cropland.(2)The total area of the“Grain-for-Green Project”from^(2)000 to 2020 was 2381700 hm^(2),of which the land use transformation was mainly dominated by the conversion of cropland to forest land,which accounted for 84.86%of the total area of the“Grain-for-Green Project”,and mainly in Zunyi,Bijie and Qianxinan Prefecture,etc.(3)A total of 257.40×10^(6)t carbon stock was added to the“Grain-for-Green Project”area from^(2)000 to 2020,showing a trend of gradual growth.Cropland shifted to forest land sequestered the largest amount of carbon,amounting to 239.89×10^(6)t(93.2%),and the soil carbon pool was the main contributor,with a carbon stock of 178.15×10^(6)t(69.21%).[Conclusion]The implementation of the“Grain-for-Green Project”helps to increase the regional ecosystem carbon stock.The carbon sequestration capacity of conversion of cropland to forest land is the largest,and the carbon sequestration capacity of conversion of cropland to grassland is smaller.The implementation of the“Grain-for-Green Project”in the future can prioritize the conversion of cropland to forest land,in order to increase the regional carbon stock.

关 键 词：退耕还林(草)工程 时空格局 碳储量 InVEST模型 

分 类 号：X171.1[环境科学与工程—环境科学]