贵州区域茶园土壤有机碳空间分布的异质性及其主导因素
Spatial Distribution and Influencing Factors of Soil Organic Carbon in Tea Plantations in Guizhou Province
辛宜静 1刘方 1陈祖拥 2刘元生 2朱健1
作者信息
- 1. 贵州大学资源与环境工程学院,贵州贵阳 550025;贵州喀斯特环境生态系统教育部野外科学观测研究站,贵州贵阳 550025
- 2. 贵州喀斯特环境生态系统教育部野外科学观测研究站,贵州贵阳 550025
- 折叠
摘要
随着茶园面积的不断扩大,了解区域土壤有机碳的空间分布规律及其影响因素,对建设碳汇茶园具有重要的指导意义.通过对贵州省区域茶园及周边林地和灌草地进行土壤样品采集,采用GIS聚类分析和地理探测器分析方法,探讨了影响茶园不同土层土壤有机碳含量空间分异性的主导因素.结果表明:贵州省区域茶园土壤有机碳含量范围为5.61～80.92 g·kg-1,其空间分布属于中等程度变异(变异系数为0.47);林地、茶园、灌草地3个区域的土壤有机碳的平均含量分别为49.34、29.80、19.65 g·kg-1;茶园土壤有机碳含量随土层深度增加而降低.利用地理探测器模型定量评估,发现海拔是影响贵州区域茶园土壤有机碳空间异质性的主导因素,海拔高度的变化明显地影响区域温度及降雨,表层土壤有机碳的空间分布主要受温度的影响,而中下层土壤有机碳的空间分布主要受到降雨的影响.可见,通过调控茶园土壤水热条件,能有效地增加茶园土壤的固碳能力及提升区域茶园的碳汇效率.
Abstract
With the continuous expansion of tea plantation area,understanding the spatial distribution of soil organic carbon and its influencing factors is of great significance in guiding the construction of carbon sink tea plantations.In this study,we investigated the dominant factors affecting the spatial variability of soil organic carbon content in different soil layers of tea plantations.Soil samples from regional tea plantations and the surrounding woodlands and scrub grasslands in Guizhou Province were collected.GIS cluster analysis and the geographical detector model analysis were adopted in the study.The results showed that the soil organic carbon content of regional tea plantations ranged from 5.61 to 80.92 g·kg-1.The spatial distribution was moderately variable(coefficient of variation 0.47).The average content of soil organic carbon was 49.34,29.80,and 19.65 g·kg-1 in the three regions of woodland,tea plantation,and scrub grassland,respectively.The soil organic carbon content of tea plantations decreased with the increase of soil depth.Quantitative assessment revealed that elevation was the dominant factor influencing the spatial heterogeneity of soil organic carbon in tea plantations.The changes in elevation significantly affected regional temperature and rainfall.The spatial distribution of soil organic carbon in the surface layer was mainly influenced by temperature,while rainfall was the main influencing factor for the middle and lower soil layers.It was concluded that the carbon sequestration capacity and the carbon sink efficiency could be effectively increased by regulating the soil hydrothermal conditions in tea plantations.
关键词
茶园/土壤有机碳/空间异质性/影响因素Key words
tea plantation/soil organic carbon/spatial heterogeneity/influencing factors引用本文复制引用
基金项目
国家重点专项部省联动计划课题(2022YFD1901505)
贵州省科技计划项目(黔科合平台人才[2017]5788号)
出版年
2024
NETL
NSTL
万方数据