生态学杂志2024，Vol.43Issue(3)：623-632,10.DOI:10.13292/j.1000-4890.202403.031
华西雨屏区不同林龄柳杉人工林表层土壤磷组分特征
Characteristics of topsoil phosphorus fractions along a chronosequence of Cryptomeria japonica var.sinensis plantations in the rainy area of western China
摘要
Abstract
Phosphorus(P)is one of the essential nutrients limiting plant productivity.However,how stand age af-fects soil P fractions remains poorly understood.Here,topsoil samples(0-20 cm)were collected from Cryptomeria japonica plantations with seven stand ages(6,12,23,27,32,46,52 years old)in the Hongya Forest Farm in the rainy area of western China in Sichuan basin.Soil P fractions were measured by Hedley P classification method.The results showed that soil total P concents ranged from 231.93 to 370.27 mg·kg-1,and were the lowest at young age(6 years old)and the highest at middle-aged forest(12 years old).The contents of soil total inorganic P and total organic P first increased and then decreased and increased respectively with increasing stand age.The propor-tion of total inorganic P to total P decreased with increasing stand age,while the pattern for total organic P was opposite.The contents of labile inorganic P,labile organic P and moderately labile organic P generally increased with increasing stand age,which may be correlated with the decrease of pH and the increase of organic carbon con-tent.Moderately labile inorganic P fractions of middle-aged(12 years old)and mature(32 years old)plantations were significantly higher than those of other stand ages.Soil non-labile P fraction first increased and then decreased with increasing stand age,with the increase in soil bulk density and the decrease in soil water content as main rea-sons.Results of multiple linear regression model and Pearson correlation analysis showed that labile inorganic P did not correlate with stand ages.Moderately labile organic P,which affects labile inorganic P,could increase with increasing stand age.The increase of moderately labile organic P with increasing stand age could positively affect the production of labile inorganic P.Our results indicated that topsoil P fractions varied with stand ages.These find-ings can help propose solutions to the problems of soil P at corresponding stand ages and provide theoretical basis for improving the quality and efficiency and maintaining soil fertility of Cryptomeria japonica plantations.关键词
华西雨屏区/林龄/针叶人工林/土壤养分/Hedley磷分级Key words
rainy area of western China/stand age/coniferous plantation/soil nutrient/Hedley phosphorus frac-tionation引用本文复制引用
杨宬君,张鑫,马孟平,胡一帆,洪宗文,熊仕臣,刘宣,游成铭..华西雨屏区不同林龄柳杉人工林表层土壤磷组分特征[J].生态学杂志,2024,43(3):623-632,10.基金项目
国家自然科学基金项目(31870602,31901295,32071745,32001165)、四川省杰出青年科技人才项目(2020JDJQ0052)、中国博士后科学基金(2022M722297)、森林和湿地生态恢复与保育四川重点实验室开放课题(2020KFKT01)、四川农业大学科研兴趣培养项目(2121996263)资助. （31870602,31901295,32071745,32001165）
