Comprehensive evaluation of soil quality of typical forests in dry-hot valley of northwest Guangxi
[Objective]This study comprehensively evaluated the soil quality of typical forest types in the dry-hot valley of northwest Guangxi,aiming to provide scientific parameters for the management of forested areas and sustainable development of forest resources in this region.[Method]Four typical forest types(evergreen and deciduous broad-leaved mixed forest,deciduous broad-leaved secondary forest,deciduous broad-leaved plantation and pure coniferous plantation)in the dry-hot valley of Northwest Guangxi were selected for the study.Fourteen physical,chemical,and biological soil indicators were measured.The minimum dataset for quality assessment was constructed using principal component analysis and the minimum dataset method.Soil quality comprehensive assessment was conducted using a weighted composite index method.[Result]1)The soil chemical nutrients and sucrase activities of pure coniferous plantations were significantly lower than those of broad-leaved forests,and there was no significant difference between the soil properties of broad-leaved plantations and those of secondary forests;2)The minimum data set of water content,total phosphorus and total nitrogen was screened out to construct the minimum data set,which could explain 77%of the total data quality index,and could effectively and systematically evaluate the soil quality in the study area.The weights were water content(0.364)＞total phosphorus(0.340)＞total nitrogen(0.296),highlighting moisture content and total phosphorus as the primary indicators influencing soil quality;3)The soil quality index ranking across different forest types is as follows:evergreen and deciduous broad-leaved mixed forest(0.618)＞deciduous broad-leaved plantation(0.598)＞deciduous broad-leaved secondary forest(0.473)＞pure coniferous plantation(0.282).The soil quality of coniferous plantations is significantly the lowest(P＜0.05).[Conclusion]The soil quality of coniferous plantations is lower than that of broad-leaved forests.The water content and total phosphorus levels emerge as crucial factors limiting soil quality in the dry-hot valley forested areas.
NETL
NSTL
万方数据
