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
杨宬君 1张鑫 2马孟平 3胡一帆 1洪宗文 1熊仕臣 1刘宣 1游成铭1
作者信息
- 1. 长江上游林业生态工程四川省重点实验室/长江上游森林资源保育与生态安全国家林业和草原局重点实验室/华西雨屏区人工林生态系统研究长期科研基地/四川农业大学生态林业研究所,成都 611100
- 2. 四川省夹江县自然资源局,四川夹江 614100
- 3. 安徽省全椒县神山国有林场,安徽全椒 239500
- 折叠
摘要
磷是限制植物生产力的重要养分之一,但土壤磷组分随林木生长发育阶段的变化特征仍不清楚.本研究以四川盆地华西雨屏区洪雅林场7个林龄(6、12、23、27、32、46、52a)柳杉人工林为对象,采集0～20 cm 土壤样品,运用Hedley磷分级法测定土壤磷组分含量,探究不同林龄柳杉人工林土壤磷组分的差异.结果表明:柳杉人工林土壤全磷含量为231.93～370.27 mg·kg-1,在幼龄林(6 a)最低,中龄林(12 a)最高;土壤总无机磷和总有机磷含量随林龄增加呈先增后降和增加的趋势.总无机磷占全磷的比例随林龄增加呈下降趋势,而总有机磷则相反.活性无机磷组分、活性有机磷组分和中等活性有机磷组分含量随林龄增加而增加,可能与pH降低和有机碳增加有显著关联.中龄林(12a)和成熟林(32a)的中等活性无机磷组分含量显著高于其他林龄.稳定态磷组分含量随林龄增加呈先增加后降低趋势,土壤容重增加和土壤含水率降低是重要影响因素.多元线性回归模型与Pearson相关性分析表明,活性无机磷与林龄无显著相关,中等活性有机磷随林龄增加而升高能正向影响活性无机磷生成.本研究发现表层土壤磷组分会随着林龄增加发生变化,这有助于对相应林龄土壤磷素出现的问题提出解决措施,为柳杉人工林提质增效与土壤肥力维持提供理论依据.
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
基金项目
国家自然科学基金(31870602)
国家自然科学基金(31901295)
国家自然科学基金(32071745)
国家自然科学基金(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基金(2020KFKT01)
四川农业大学科研兴趣培养项目(2121996263)
出版年
2024
国家科技期刊平台
NSTL
万方数据