湘西南紫色土区小流域水土保持综合治理碳汇能力监测与评价OA
Monitoring and evaluation of carbon sink capacity of comprehensive soil and water conservation measures in small watersheds in purple soil region of southwestern Hunan province
[目的]监测并评价湘西南紫色土区小流域的碳汇,为水土保持项目碳汇能力评估提供技术和方法,为西南紫色土区水土保持碳汇研究提供借鉴.[方法]通过30个样地实地采样测定土壤密度和有机碳含量,记录每棵树木的胸径,分析核算小流域2004-2024年的植被碳库、土壤碳库及保土保碳量.[结果]1)20 a综合治理后,慈利县黄泥桥和四坪溪小流域碳储量年均增长4.46×103t.2)情景措施土壤碳储量相较基线情景增加11.89％,植被碳储量相较基线情景增加54 078.62％,项目区保土保碳量为52.54 t.3)封禁治理、水土保持林营造和坡改梯工程等水土保持措施提升碳汇能力不同,其中封禁治理毛竹和杂竹提升土壤碳汇表现突出,水土保持林营造湿地松林植物碳汇密度最高,坡改梯工程对于保护土壤和减少侵蚀具有重要意义.[结论]各种水土保持措施的保碳、固碳、增汇作用明显,其中松类和杉木等营造林地能有效提高水土保持综合治理效益.
[Objective]Monitoring and evaluating carbon sink in small watersheds of the purple soil region in southwestern Hunan Province provides techniques and methods for assessing the carbon sink capacity of soil and water conservation projects,and offers a reference for carbon sink research in soil and water conservation in the purple soil region of southwestern Hunan.[Methods]Through field sampling of 30 plots,soil bulk density and organic carbon content were measured,and the diameter at breast height of each tree was recorded.The vegetation carbon pool,soil carbon pool,and soil and carbon retention in the small watershed from 2004 to 2024 were analyzed and quantified.[Results]1)After 20 years of comprehensive management,the average annual increase in carbon storage in the Huangniqiao and Sipingxi small watersheds of Cili County was 4.46 × 103 t/a.2)Compared with the baseline scenario,soil carbon storage under the project scenario increased by 11.89％,and vegetation carbon storage increased by 54 078.62％.The soil and carbon retention amount in the project area reached 52.54 t.3)Different soil and water conservation measures,including exclosure management,afforestation of soil and water conservation forests,and slope-to-terrace projects,varied in their capacity to enhance carbon sink.Specifically,exclosure management of Phyllostachys edulis and Bambusa spp.stands demonstrated the most significant enhancement in soil carbon sink.Meanwhile,afforestation of soil and water conservation forests with P.elliottii had the highest vegetation carbon sink density.The slope-to-terrace project was of great significance for soil protection and erosion reduction.[Conclusions]Various soil and water conservation measures demonstrate significant effects in carbon preservation,carbon sequestration,and carbon sink enhancement.Among them,afforested areas with species such as P.elliottii,Pinus massoniana,and Cunninghamia lanceolata effectively improve the overall benefits of comprehensive soil and water conservation management.
陈志;李玉婷;唐若晗;左双苗;马江山;王勇;谭艳玲
湖南省水利水电科学研究院,410007,长沙中南林业科技大学,410004,长沙中南林业科技大学,410004,长沙湖南省水利厅,410000,长沙中南林业科技大学,410004,长沙张家界市慈利县水资源和水土保持事务中心,427200,湖南张家界浙江树人学院,310000,杭州
农业科技
水土保持碳汇能力监测评价小流域西南紫色土区
soil and water conservationcarbon sink capacitymonitoring and evaluationsmall watershedsouthwestern purple soil region
《中国水土保持科学》 2026 (2)
62-70,9
湖南省水利厅科技项目"湖南省小流域综合治理项目碳汇核算方法和价值实现机制研究"(XSKJ2024064-21),"涟源市水土保持科技示范园综合治理项目碳汇核算方法和价值实现机制研究"(XSKJ2025056-69) Scientific Research Project of Hunan Provincial Department of Water Resources"Study on Carbon Sink Accounting Methods and Value Realization Mechanisms for Comprehensive Management of Small Watersheds in Hunan Province"(XSKJ2024064-21),"Study on Carbon Sink Accounting Methods and Value Realization Mechanisms for Comprehensive Management of the Soil and Water Conservation Science and Technology Demonstration Park in Lianyuan City"(XSKJ2025056-69)
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