花椒林在喀斯特石漠化治理中的碳汇效益

Carbon Sequestration Benefits of Zanthoxylum Bungeanum Forest in Karst Rocky Desertification Treatment Areas

[目的]评价石漠化地区花椒林的碳汇功能,为石漠化治理工程的碳汇效益提供技术示范与参考。[方法]以贵州省花江喀斯特石漠化治理示范区生态环境综合治理模式下顶坛花椒(Zanthoxylum planispinum)为研究对象,依据当地的石漠化现状,通过测定强度、中度和轻度石漠化和不同龄级的花椒林生物量、土壤深度和持土量,对花椒林碳汇量进行估算。[结果]石漠化程度越高,花椒林碳汇量越低,反之,石漠化程度越低,花椒林碳汇量越大,其中轻度石漠化花椒林碳密度为3.24t/hm2,中度石漠化为3.12t/hm^2,强度石漠化为2.81t/hm^2,轻度>中度>强度;随着土壤深度和持土量的增加,花椒林碳汇量也呈现增加的趋势。[结论]花椒林的平均碳密度为3.06t/hm^2,花椒林的综合最优碳汇经济效益为1.92×10~4~2.56×10~4元/hm^2。

[Objective]The objective of this study is to analyze the carbon sequestration benefits of Zanthoxylum bungeanumforest in order to provide support for the benefits assessment of karst rocky desertification control projects.[Mehtods]Z.bungeanumin Huajiang karst rocky desertification treatment demonstration site was chosen as the research object.The biomass,soil depth and soil holding capacity of Z.bungeanum forests with different forest ages were investigated in different rocky desertification areas（intensive,moderate and light desertification intensity）.The carbon sequestration benefits of Z.bungeanumforests were then estimated.[Results]It was found that the carbon sequestration decreased with the increase of the desertification intensity.The carbon density of Z.bungeanum forest in light rocky desertification areas was 3.24t/hm^2,while it respectively was 3.12 and 2.81t/hm^2 in moderate and intensive rocky desertification areas.With the increase of the soil depth and soil hold capacity,the carbon sequestration of Z.bungeanumforest increased.[Conciusion]The average carbon density of Z.bungeanumforest was 3.06t/hm^2,and the optimal carbon sink economic benefits was 19.2thousand yuan of per hectare to 25.6thousands yuan of per hectare.