海南岛西部原始林土壤有机碳分布特征及其影响因素  

Distribution Characteristics and Influencing Factors of Soil Organic Carbon in Western Primeval Forests in Hainan Island

作　　者：吴慧 赵志忠[1] 吴丹[1] Wu Hui;Zhao Zhizhong;Wu Dan(Hainan Normal University,Haikou 571158,P.R.China)

机构地区：[1]海南师范大学,海口571158

出　　处：《东北林业大学学报》2023年第9期107-111,共5页Journal of Northeast Forestry University

基　　金：海南省院士创新平台项目(YSPTZX202024);海南省研究生创新平台项目(Qhys2021-299)。

摘　　要：以海南岛热带雨林西部最具代表性的尖峰岭、霸王岭、鹦哥岭3个区域的森林土壤作为研究对象,分析原始林区域土壤有机碳的空间分布规律,探究土壤理化性质、地形因子对土壤有机碳分布特征及稳定性的影响。结果表明:3个原始林地区土壤有机碳平均质量分数由大到小依次为鹦哥岭(15.50 g·kg^(-1))、尖峰岭(15.49 g·kg^(-1))、霸王岭(12.81 g·kg^(-1)),为中等变异。尖峰岭、霸王岭、鹦哥岭原始林表层土壤有机碳质量分数占整个土壤剖面有机碳质量分数的百分比分别为50.24%、38.32%、45.20%,其表聚性非常明显。研究区内各原始林区有机碳质量分数总体随着海拔的上升而升高。尖峰岭、霸王岭区域土壤有机碳质量分数与粉粒、黏粒占总粒级数量的比例呈正相关,与砂粒占总粒级数量的比例呈负相关;鹦哥岭有机碳质量分数与粗砂粒占总粒级数量的比例呈正相关。各原始林易氧化有机碳质量分数与有机碳质量分数呈极显著正相关(P<0.01)。土壤pH与有机碳质量分数的相关性由强至弱依次为鹦哥岭、尖峰岭、霸王岭,相关系数分别为0.489、0.236、0.226。海拔、土壤质地、土壤pH是影响研究区有机碳质量分数的主要因子。Forest soils in Jianfengling,Bawangling and Yinggeling,the most representative areas of tropical rainforests in the west of Hainan Island,were taken as research objects to analyze the spatial distribution of soil organic carbon in the primary forest area.The effects of soil physicochemical properties and topographic factors on the distribution characteristics and stability of soil organic carbonwere explored.The average content of soil organic carbon in the three primary forest areas was in the order of Yinggeling(15.50 g·kg^(-1)),Jianfengling(15.49 g·kg^(-1))and Bawangling(12.81 g·kg^(-1)).In Jianfengling,Bawangling and Yinggeling,the surface soil organic carbon contents accounted for 50.24%,38.32%and 45.20%of the whole soil profile,respectively,and the surface accumulation was very obvious.The organic carbon mass fraction of the primary forest area in the study area generally increased with the elevation increasing.In Jianfengling and Bawangling regions,soil organic carbon content was positively correlated with the proportion of silt and clay in the total number of grains,and negatively correlated with the proportion of sand in the total number of grains,while in Yinggeling,soil organic carbon content was positively correlated with the proportion of coarse sand in the total number of grains.There was a significant positive correlation between easily oxidized organic carbon and organic carbon contents(P<0.01).The correlation between soil pH and organic carbon content was Yinggeling,Jianfengling and Bawangling from strong to weak,with the correlation coefficients of 0.489,0.236 and 0.226,respectively.Therefore,altitude,soil texture and soil pH were the main factors affecting the organic carbon content in the study area.

关 键 词：海南岛 原始林 有机碳质量分数 影响因素 

分 类 号：S714[农业科学—林学]