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作 者:殷凡 马妤昕 陈洋溢 郑杰 耿倩雯 李昌晓 YIN Fan;MA Yuxin;CHEN Yangyi;ZHENG Jie;GENG Qianwen;LI Changxiao(School of Life Sciences,Southwest University/Key Laboratory of Eco-Environments in the Three Gorges Reservoir Region(Ministry of Education),Chongqing 400715,China)
机构地区:[1]西南大学生命科学学院/三峡库区生态环境教育部重点实验室,重庆400715
出 处:《西南大学学报(自然科学版)》2025年第3期1-9,共9页Journal of Southwest University(Natural Science Edition)
基 金:国家自然科学基金项目(31960038);重庆市建设科技计划项目(城科字2022-6-3);重庆市科技兴林项目(2021-9);中央林业改革发展资金科技推广示范项目(渝林科推2023-8)。
摘 要:植被对于防治土壤侵蚀、提高土壤质量、改善土壤养分等方面具有重要作用。土壤生态化学计量特征能反映土壤养分元素的循环机制。当前针对西南山地不同植被类型下土壤养分及其生态化学计量特征的相关研究较少,以重庆市垫江县3种典型植被类型(针叶林、针阔混交林、阔叶林)的实生土壤为研究对象,对表层土壤C、N、P、K质量分数及其生态化学计量特征进行分析,得到以下结论:①土壤全C、全N质量分数呈极显著正相关,且均为针叶林最高;土壤全P质量分数为针阔混交林最高,全K质量分数为针阔混交林最低。②不同植被类型下土壤C/N、P/K的值差异无统计学意义,植被生长主要受到N和P的限制。③土壤全C、全N质量分数分别与C/N、C/P、C/K、N/P、N/K的值存在显著正相关关系;C/N、C/P、C/K、N/P、N/K的值之间均存在显著正相关关系,P/K与N/K的值存在显著正相关关系。Vegetation plays an important role in preventing soil erosion,improving soil quality,and enhancing soil nutrient cycling.Soil ecological stoichiometric characteristics can reflect the mechanism of soil nutrient element cycling.However,little research is available on soil nutrient stoichiometry characteristics under different vegetation types of southwest China.In this study,three vegetation types(coniferous forest,mixed coniferous and broad-leaved forest,and broad-leaved forest)in Dianjiang County of Chongqing Municipality,were selected to analyze their soil C,N,P,K and their ecological stoichiometric characteristics.Results showed that:①Soil total C and total N contents were significantly positively correlated,and the highest contents of both were in coniferous forests.The highest soil total P content was in mixed coniferous and broad-leaved forests,and the lowest total K content was in mixed coniferous and broad-leaved forests.②The ratios of soil C/N and P/K under different vegetation types were significantly different,and the growth of vegetation was mainly limited by N and P.③There were significant positive correlations between soil total C and total N content with the ratio of C/N,C/P,C/K,N/P and N/K,respectively.There were significant positive correlations between the ratios of C/N,C/P,C/K,N/P,N/K and between the ratios of P/K and N/K.
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