林业科学2024，Vol.60Issue(11)：37-47,11.DOI:10.11707/j.1001-7488.LYKX20240154
百山祖国家公园人工林土壤磷素有效性及其影响因素
Soil Phosphorus Availability and Its Influencing Factors of the Plantations in Baishanzu National Park
摘要
Abstract
[Objective]The aim of this study is to investigate how different stand types affect soil phosphorus availability and to identify the critical inorganic phosphorus fractions that regulate this availability.This research seeks to provide a theoretical foundation for maintaining soil fertility and implementing sustainable management practices in the different plantation soils of Baishanzu National Park.[Method]This study took the four types of plantations as objectives,including Chinese fir pure forest,masson pine pure forest,Chinese fir-masson pine mixed forests,Chinese fir-moso bamboo mixed forests.We determined the basic properties,inorganic phosphorus fractions and available phosphorus content of the 0-10,10-20,and 20-40 cm soil layers,and analyzed the differences of total phosphorus content,available phosphorus content,and inorganic phosphorus fractions among stand types to reveal the key driving factors for the variations in soil phosphorus availability.[Result]The total phosphorus and available phosphorus content in the 0-40 cm soil layer across the four stand types were 0.14-0.24 g·kg-1 and 0.73-1.72 mg·kg-1,respectively,with average values of 0.19 g·kg-1 and 1.11 mg·kg-1,respectively.The phosphorus activation coefficient in the 0-40 cm soil layer across the four stand types was 0.42%-0.72%,with an average value of 0.59%.Notably,these values reached their peak in the Chinese fir-moso bamboo mixed forests.The content of each inorganic phosphorus fraction in the 0-40 cm soil layer across the four stand types showed differences,with the Chinese fir-moso bamboo mixed forests having higher values than the other three stand types.Except for occluded phosphate content,the contents of aluminum phosphate,iron phosphate,calcium phosphate,and soluble phosphorus were all significantly positively correlated with available phosphorus content(P<0.01).Standardized major axis analysis revealed that the allometric index for the relationship between aluminum phosphate content and available phosphorus content is significantly below 1.00(P<0.01).In contrast,the allometric index for iron phosphate content,calcium phosphate content,and soluble phosphorus content in relation to available phosphorus content are all significantly above 1.00(P<0.01).The random forest analysis identified aluminum phosphate content,hydrolyzable nitrogen content,and total nitrogen content as the most significant regulatory factors influencing available phosphorus content.The partial least squares structural equation model indicated that stand type indirectly enhanced available phosphorus levels by influencing basic soil properties such as total nitrogen content and hydrolyzable nitrogen content,stoichiometric ratios including organic carbon to total nitrogen and total nitrogen to total phosphorus,as well as inorganic phosphorus fractions such as aluminum phosphate content and iron phosphate content.[Conclusion]In this study area,while stand type does not have a significant direct impact on available phosphorus,it significantly influences available phosphorus indirectly by modulating nitrogen levels,nutrient ratios,and inorganic phosphorus fractions.Aluminum phosphate emerges as the most critical regulatory factor affecting soil phosphorus availability.Overall,developing mixed coniferous and broad-leaved forests will be a vital strategy for enhancing soil phosphorus availability in the plantation stands of Baishanzu National Park.关键词
林分类型/有效磷/无机磷组分/磷酸铝盐/百山祖国家公园/人工林/影响因素Key words
stand types/available phosphorus/inorganic phosphorus fractions/aluminum phosphate/Baishanzu National Park/plantation/influencing factors分类
农业科技引用本文复制引用
周方,蒋科毅,叶兰华,沈庆华,童冉,朱念福,苗永朝,吴统贵..百山祖国家公园人工林土壤磷素有效性及其影响因素[J].林业科学,2024,60(11):37-47,11.基金项目
百山祖国家公园科学研究项目(2021KFLY12) （2021KFLY12）
中国林业科学研究院中央级公益性科研院所基本科研业务费专项资金资助项目(CAFYBB2022SY010) （CAFYBB2022SY010）
国家重点研发计划项目(2023YFD2200900). （2023YFD2200900）
