生态环境学报2025，Vol.34Issue(9)：1386-1397,12.DOI:10.16258/j.cnki.1674-5906.2025.09.006
湖南典型茶园土壤有机碳及其组分时空特征
Spatio-temporal Characteristics of Soil Organic Carbon and Its Components in Typical tea Gardens in Hunan Province,China
摘要
Abstract
Soil organic carbon pool is the largest carbon pool in terrestrial ecosystems.The quantity and quality of the soil organic carbon(SOC)pool determines the soil fertility status;thus,it is an important indicator for assessing soil quality.Tea plantations are one of the most important land use types in China,and the study of the composition and spatio-temporal variations of soil organic carbon pools in tea plantations is of great significance for accurately assessing regional carbon sinks.In this study,12 typical tea-planting areas in Hunan Province,located in the subtropical zone,were selected as research subjects.Soil samples were collected from tea gardens with different planting years(0‒5 years,10‒15 years,and over 20 years)in each area.The effects of planting year,soil depth,and tea ridge/row distribution on the content and composition characteristics of soil organic carbon in tea gardens were studied to provide a scientific basis for carbon sink assessment and fertility improvement in tea garden soils.The results showed that in typical tea gardens in Hunan Province,soil organic carbon contents in the 0‒20 cm and 20‒40 cm soil layers were 11‒48.88 g·kg-1 and 1.79‒33.08 g·kg-1,respectively.Soil organic carbon content showed an increasing trend with increasing planting years.The average soil organic carbon contents were 11.12 g·kg-1,12.89 g·kg-1,and 17.91 g·kg-1 in the 0‒40 cm soil layer with 0‒5 years,10‒15 years,and over 20 years of planting,respectively.Soil organic carbon content of the tea ridges was significantly lower than that of the tea rows.The average soil organic carbon content in the 0-40 cm soil layer of tea rows were1.37 times that of the tea ridges.The dissolved organic carbon,microbial biomass carbon,particulate organic carbon,and mineral-associated organic carbon content in tea garden soil accounted for 1.21%,1.31%,25.71%,and 41.59%of soil organic carbon,respectively.The spatial and temporal variations of soil organic carbon components in tea plantations showed that with the increase in planting years,the content of soil organic carbon components increased,but the proportion of mineral-associated carbon in soil organic carbon decreased in tea gardens for more than 20 years,and the content of soil organic carbon components in tea rows was significantly higher than that in tea ridges.Random forest analysis showed that attitude was the most critical factor affecting the SOC content in tea gardens in Hunan Province.We estimated that the soil organic carbon storage reached 18.6×10⁶ t in the 0‒40 cm soil layer of tea gardens in Hunan Province.In summary,with increase soil depth,the content of soil organic carbon and its components in tea gardens decreased.The increase in planting years was beneficial to the accumulation of soil organic carbon and its components in tea gardens,which had the potential to act as carbon sinks.关键词
植茶年限/土层深度/茶园/土壤有机碳/有机碳组分Key words
tea-planting years/soil depth/tea garden/soil organic carbon/components of organic carbon分类
农业科技引用本文复制引用
刘卿,龚雨顺,王伟,方贤滔,吴金水,沈健林..湖南典型茶园土壤有机碳及其组分时空特征[J].生态环境学报,2025,34(9):1386-1397,12.基金项目
国家自然科学基金国际项目(42161144002 （）
U23A2009) （）
中国科学院青年创新促进会优秀会员项目(Y2021102) （Y2021102）
