华西雨屏区不同林龄柳杉人工林土壤磷组分特征  

Patterns of soil phosphorus fractions across a chronosequence of Cryptomeria japonica var.sinensis in rainy area of western China

作　　者：胡一帆 刘宣 李宇 熊仕臣 张璐瑶 李济宏 袁春阳 徐振锋[1,2,3] 游成铭 谭波 徐红伟[1,2,3] 徐琳 HU Yifan;LIU Xuan;LI Yu;XIONG Shichen;ZHANG Luyao;LI Jihong;YUAN Chunyang;XU Zhenfeng;YOU Chengming;TAN Bo;XU Hongwei;XU Lin(Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province,College of Forestry,Sichuan Agricultural University,Chengdu 611130,China;National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River,Chengdu 611130,China;Rainy Area of West China Plantation Ecosystem Permanent Scientific Research Base,Chengdu 611130,China)

机构地区：[1]四川农业大学林学院,长江上游林业生态工程四川省重点实验室,成都611130 [2]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,成都611130 [3]华西雨屏区人工林生态系统研究长期科研基地,成都611130

出　　处：《生态学报》2024年第2期686-698,共13页Acta Ecologica Sinica

基　　金：四川省自然科学基金项目(2023NSFSC1191);国家自然科学基金项目(32071745);四川省杰出青年科技人才项目(2020JDJQ0052);四川省应用基础项目(2022NSFSC0083)。

摘　　要：磷是限制陆地生态系统生产力的关键养分因子。当前尚不了解不同土壤磷组分随柳杉林龄增长如何变化,及其与土壤微生物群落的关系。以华西雨屏区不同林龄(7年生幼龄林、13年生中龄林、24年生近熟林、33年生成熟林,53年生过熟林)柳杉(Cryptomeria japonica var.sinensis)人工林为研究对象,采用Hedley磷素分级方法、磷脂脂肪酸分析法(PLFA)来探究不同林龄柳杉人工林土壤磷组分的分布模式及影响因子。结果表明:不同林龄和土壤深度土壤磷各组分含量差异显著。随林龄增加,可溶性磷和磷灰石含量逐渐减少,残余态磷含量逐渐增加,其余磷组分含量先增加后降低。除可溶性磷、浓盐酸提取态无机磷和残余态磷组分外,其余土壤磷组分含量表现为上层(0—15 cm)高于下层(15—30 cm)。偏门特尔检验表明,微生物群落与土壤磷组分之间存在显著关联。回归分析发现,碳与有机磷比值和酸性磷酸酶活性呈正相关。冗余分析显示,pH、土壤有机碳、土壤含水量,全氮和土壤容重是影响土壤磷组分变化的主导因子。研究显示,造林初期的土壤磷组分快速积累,在中龄林阶段达到最大值,随着柳杉人工林林龄的增加,土壤中磷的限制逐渐加强,土壤磷组分含量在成熟林之后逐渐下降。这些结果可为为柳杉人工林的培育及可持续经营管理提供科学依据。Despite the abundant content of soil total phosphorus,it is a key limiting factor of primary productivity in most terrestrial ecosystems,owing to low weathering rate of parent materials,leaching and its strong affinity to soil minerals.Currently,it remains largely unknown about how soil phosphorus fraction changes with increasing stand age of Cryptomeria japonica var.sinensis and its relationship with soil microbial communities.This study aims to explore the variation patterns of soil phosphorus fractions in C.japonica plantations with different stand ages and soil depths,and to address the relationships between soil microbial communities and different soil phosphorus fractions.This study was conducted in rainy area of western China,soil samples from different stand ages of C.japonica plantations(7⁃year⁃old young forest,13⁃year⁃old middle⁃aged forest,24⁃year⁃old near⁃mature forest,33⁃year⁃old mature forest and 53⁃year⁃old over⁃mature forest)were collected.Using Hedley′s sequential P fractionation and phospholipid fatty acids(PLFA)methods,the above goals were achieved.The results showed that each fraction of soil P was significantly different among stand ages and soil depths.With the growth of C.japonica,the content of soluble organic phosphorus(Soluble Pi)and apatite phosphate(Dil.HCl⁃Pi)gradually decreased,and the content of residual phosphorus(Residual P)gradually increased,and the content of other phosphorus fractions showed increasing firstly and then decreasing trends.Except for the Soluble Pi,Conc.HCl⁃Pi and Residual P,all soil phosphorus fractions were significantly different regarding different soil depths.Under different stand ages,the contents of phosphorus fractions in 0—15 cm soil were significantly higher than those in 15—30 cm soil.Partial Mantel tests showed a significant association between soil microbial communities(represented by phospholipid fatty acids)and soil phosphorus fractions.Further regression analysis showed that soil organic C to total organic P rat

关 键 词：土壤磷组分 林龄 土壤深度 柳杉人工林 

分 类 号：S71[农业科学—林学]