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、52 a)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(12 a)和成熟林(32 a)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。
Phosphorus(P)is one of the essential nutrients limiting plant productivity.However,how stand age affects 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^(2)31.93 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 proportion 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 content.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 reasons.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 findings can help propose solutions to the problems of soil P at corresponding stand ages and provide theoretical basis for improving the qua
作者
杨宬君
张鑫
马孟平
胡一帆
洪宗文
熊仕臣
刘宣
游成铭
YANG Chengjun;ZHANG Xin;MA Mengping;HU Yifan;HONG Zongwen;XIONG Shichen;LIU Xuan;YOU Chengming(Provincial Key Laboratory for Forestry Eco-logical Engineering of the Upper Reaches of Yangtze River/Key Laboratory of State Forestry and Grassland Adminis-tration for Forest Resources Conservation and Ecological Security in the Upper Yangtze River/Long-term Research Base for Plantation Ecosystem Research in the Rainy Area of Western China/Ecological Forestry Institute,Sichuan Agricul-tural University,Chengdu 611100,China;Department of Natural Resources,Jiajiang 614100,Sichuan,China;State-owned Forest Farm of Shen Mountain,Quanjiao 239500,Anhui,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2024年第3期623-632,共10页
Chinese Journal of Ecology
基金
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。
关键词
华西雨屏区
林龄
针叶人工林
土壤养分
Hedley磷分级
rainy area of western China
stand age
coniferous plantation
soil nutrient
Hedley phosphorus fractionation
