农业现代化研究2024，Vol.45Issue(3)：520-530,11.DOI:10.13872/j.1000-0275.2024.0017
细根性状对土壤养分有效性的直接影响与机制
The direct effect and mechanism of fine root traits on soil nutrient availability:A case study of subtropical Chinese fir and broad-leaved mixed forest
摘要
Abstract
The effect of fine root traits on soil nutrient availability is mediated by microorganisms or by direct interaction between fine roots and soil.However,the former has received a lot of attention,while the latter has rarely been reported.In this study,six mixed tree species(3 resource-acquisitive and 3 resource-conservative)in a subtropical Chinese fir-broadleaf mixed forest were used as the research object.The direct,indirect,and overall effects of fine roots on soil nitrogen and phosphorus availability and the relationship between fine root traits and them were studied by an in-situ net bag test.The results showed that fine root direct contact with soil could improve the availability of soil N and P under both resource utilization strategies.The effect of acquisitive tree species on soil phosphorus was more significant,showing stronger direct,indirect,and overall effects,while the indirect effect of conservative tree species on soil nitrogen was stronger.Moreover,the C/N ratio of fine roots is the primary factor regulating its effect on soil N and P availability.The direct effect of resource utilization strategies on nitrogen availability mainly depends on the strength of nutrient uptake,and the indirect effect is dominated by organic nitrogen mineralization.Fine roots with a low C/N ratio directly promote P availability by producing more phosphatases or indirectly promote P availability by reducing soil pH.This study enriched the regulatory mechanism of fine root traits on soil nutrient availability and provided theoretical support for the selection of associated tree species in mixed forests.关键词
细根性状/资源利用策略/直接效应/土壤氮有效性/土壤磷有效性/酶活性Key words
fine root traits/resource-use strategy/direct effect/soil N availability/soil P availability/enzyme activity分类
农业科技引用本文复制引用
金朝斌,魏晓梦,徐海东,庞丹波,王聪,申卫军..细根性状对土壤养分有效性的直接影响与机制[J].农业现代化研究,2024,45(3):520-530,11.基金项目
国家自然科学基金项目(42107369,32271847) （42107369,32271847）
广西森林生态与保护重点实验室开放基金(20221204) （20221204）
广西科技计划项目(AD20238040,AD23026326). National Natural Science Foundation of China(42107369,32271847) （AD20238040,AD23026326）
The Open Foundation of Guangxi Key Laboratory of Forest Ecology and Conservation(20221204) （20221204）
Guangxi Science and Technology Plan Project(AD20238040,AD23026326). （AD20238040,AD23026326）
