黔南喀斯特峰丛洼地3种建群树种不同器官C、N、P化学计量特征  

C,N,P stoichiometric characteristics in different organs of three constructive plants in Karst peak-cluster depressions in southern Guizhou,Southwest China

作　　者：蔡国俊[1] 锁盆春 张丽敏[1] 符裕红 李安定[1] CAI Guojun;SUO Penchun;ZHANG Limin;FU Yuhong;LI Anding(Institute of Mountain Resources,Guizhou Academy of Science,Guiyang,Guizhou 550001,China;Environmental Protection and Technology Bureau of Weining County,Weining,Guizhou 553100,China;School of Chemistry and Life Science,Guizhou Normal College,Guiyang,Guizhou 550018,China)

机构地区：[1]贵州科学院贵州省山地资源研究所,贵州贵阳550001 [2]毕节市生态环境局威宁分局,贵州威宁553100 [3]贵州师范学院化学与生命科学学院,贵州贵阳550018

出　　处：《贵州师范大学学报（自然科学版）》2021年第5期36-44,共9页Journal of Guizhou Normal University：Natural Sciences

基　　金：贵州省科技厅重大基础研究项目(黔科合JZ字[2014]200208);“十三五”国家重点研发计划(2016YFC050260404)。

摘　　要：研究植物器官中碳(C)、氮(N)、磷(P)的生态化学计量特征,对了解植物体内养分的吸收、运输和分配机理,揭示植物生活史策略及其响应和适应环境的机制具有重要意义。以喀斯特峰丛洼地3种建群树种为研究对象,对其根、茎、枝、叶中的C、N、P化学计量特征及其相关性进行了分析,研究结果表明:C含量在3种建群树种器官中的分配表现为叶(496.45±20.28 mg/g)>根(472.35±13.8 mg/g)>茎(471.01±8.85 mg/g)>枝(468.04±11.36 mg/g),N、P含量分配表现为叶(21.39±3.11 mg/g,0.99±0.19 mg/g)>枝(6.30±1.30 mg/g,0.50±0.13 mg/g)>根(6.27±1.0 mg/g,0.39±0.08 mg/g)>茎(1.65±0.47 mg/g,0.22±0.05 mg/g),同一养分元素在不同器官中的分配有显著差异;N、P含量在各树种和各器官(干、皮、枝、叶)之间表现出较大的变异,而C含量在各树种和各器官之间变异较小;C∶N和C∶P表现茎中最高,叶中最低;3种建群种植物N∶P平均值为22.02±3.79,受P限制;相关性分析表明植物同一器官对不同养分的吸收以及不同器官对同一养分元素的吸收和利用均具有一定的协同特征。研究可为喀斯特峰丛洼地地区植物的养分循环、生态策略及环境适应机制研究提供基础数据。Exploring variation patterns of C,N,P contents and their stoichiometric characteristics in plant vegetative organs can provide insight on the absorption,transportation and allocation strategy of nutrients,which is of great significance for revealing plant ecological strategies and environmental adaptation mechanisms.In this article,three constructive species(Quercus fabrei,Quercus variabilis and Betula luminifera)in Karst peak-cluster depression,southwest China,were selected.The C,N,and P concentrations and their stoichiometric characteristics in different plant organs(root,stem,branch and leaf)were examined.Correlation of stoichiometric characteristics among organs and nutrients concentrations were also analyzed.The results showed that the allocation of the same nutrient element were of significant differences in different organs,the order of the mean content of C in organs was leaf(496.45±20.28 mg/g)>root(472.35±13.8 mg/g)>stem(471.01±8.85 mg/g)>branch(468.04±11.36 mg/g),N and P contents were in the order of leaf(21.39±3.11 mg/g,0.99±0.19 mg/g)>branch(6.30±1.30 mg/g,0.50±0.13 mg/g)>root(6.27±1.0 mg/g,0.39±0.08 mg/g)>stem(1.65±0.47 mg/g,0.22±0.05 mg/g).N and P concentrations vary greatly among species and organs,while C concentrations varies less among species and organs.C∶N and C∶P values are highest in stem and lowest in leaf,the average value of N∶P among constructive plants is 22.02±3.79,which indicating that vegetation growth was mainly limited by P.Correlation analysis showed that there are certain synergistic characteristics in plants`absorption of different nutrients in the same organ or absorption and utilization of the same nutrient element by different organs.This study can provide basic data for the research of plant nutrient cycling,ecological strategies and environmental adaptation mechanisms in Karst peak-cluster depression areas.

关 键 词：生态化学计量 生态策略 适应机制 喀斯特峰丛洼地 养分利用 

分 类 号：S572[农业科学—烟草工业]