广东省土地利用及其变化和林业碳核算研究  

Carbon accounting for land use,land-use change and forestry in Guangdong province

作　　者：吕国玮 周建春 蔡玉梅 孟超 李升发 陈伟莲[5,6,7] LYU Guowei;ZHOU Jianchun;CAI Yumei;MENG Chao;LI Shengfa;CHEN Weilian(College of Land Science and Technology,China Agricultural University,Beijing 100193,China;Sanya Institute of China Agricultural University,Sanya 572025,Hainan,China;Research Center for Territory Spatial Planning,Ministry of Natural Resources,Beijing 100812,China;China National Land Survey and Planning Institute,Beijing 100035,China;Guangzhou Institute of Geography,Guangdong Academy of Sciences,Guangzhou 510070,China;Guangdong Provincial Key Laboratory of Remote Sensing and Geographical Information System,Guangzhou 510070,China;Guangdong Open Laboratory of Geospatial Information Technology and Application,Guangzhou 510070,China)

机构地区：[1]中国农业大学土地科学与技术学院,北京100193 [2]三亚中国农业大学研究院,三亚572025 [3]自然资源部国土空间规划研究中心,北京100812 [4]中国国土勘测规划院,北京100035 [5]广东省科学院广州地理研究所,广州510070 [6]广东省遥感与地理信息系统重点实验室,广州510070 [7]广东省地理空间信息技术与应用公共实验室,广州510070

出　　处：《地理学报》2023年第3期640-657,共18页Acta Geographica Sinica

基　　金：中德国际合作项目(IATI7183770);教育部哲学社会科学重大课题攻关项目(19JZD013);中国国土勘测规划院自然资源部土地利用重点实验室开放基金项目(2020-164-1)。

摘　　要：土地利用及其变化和林业(LULUCF)是重要的碳源和碳汇,探索建立高精度的LULUCF碳核算体系是推动土地低碳利用和精细管理的关键基础。本文以广东省为例,采用库—差别法,基于森林资源二类调查、土壤普查、土地利用等数据,在地块尺度上系统核算了因LULUCF产生的碳源和碳汇。研究表明,2018年广东省LULUCF碳汇为2967.3万t CO_(2)a^(-1),其中生物量碳汇约占70%,土壤碳汇约占30%,提升土地植被盖度和加强林木经营是增加LULUCF碳汇最主要手段。相同地类不同地块的碳源或碳汇强度差异较大,林地、湿地、耕地、建设用地、草地等地类均可能出现跨碳源和碳汇类别的差异。土地利用“碳排放系数”为常数的碳核算方法难以满足“双碳”目标下土地利用的精细管理需要。本文提出的LULUCF碳核算综合了生物量及土壤碳库的变化,满足履行《联合国气候变化框架公约》要求,在全国范围具有适用性,植被异速生长模型和土壤碳库年度变化分异图可支撑地块尺度土地利用碳源或碳汇多情景分析,其核算结果可为土地利用和自然资源管理的低碳增汇政策制定提供参考。Land use,land-use change,and forestry,also known as LULUCF,are significant sources and sinks of carbon.A high-precision carbon accounting system for LULUCF should always be established as the primary building block for advancing low-carbon land use and sophisticated land management.This study uses the stock-difference method to account for carbon sources and sinks brought by LULUCF at the plot scale in Guangdong.According to the carbon accounting based on the surveys on soil,land use,and forest resources,Guangdong’s LULUCF produced 29.673 million tons of carbon sinks in 2018,of which the biomass carbon sink contributed approximately 70%and the soil carbon sink around 30%.The major ways to increase LULUCF carbon sinks,therefore,are to increase plant cover and improve forest management.Different areas within the same land-use type have various carbon accounting values.Even within particular land-use types,such as forestland,wetland,cropland,settlements,and grassland,the carbon accounting values may fluctuate between being recognized as carbon sources and carbon sinks.In the era of reaching carbon peaking and carbon neutrality goals,it is difficult to meet the land-use management requirements with a carbon accounting technique assuming the carbon emission coefficient of every land-use type is constant.The carbon accounting of LULUCF in this study takes annual fluctuations in biomass and soil organic carbon pools into account,which complies with the United Nations Framework Convention on Climate Change criteria and is applicable on a national level in China.Meanwhile,the vegetation allometric growth model and the differentiation map of annual fluctuations of the soil carbon pool resulting from this study can be utilized to enable multi-scenario analyses of the carbon sources or sinks of lands at the plot scale.Finally,the results of the LULUCF carbon accounting offer some support for policymaking that emphasizes decreasing carbon sources and increasing carbon sinks in the management of land use and natural resource

关 键 词：土地利用 LULUCF 碳核算 库—差别法 广东省 

分 类 号：F301.2[经济管理—产业经济] F326.27[环境科学与工程—环境工程] X322