荒漠草原主要植物种群生态化学计量学特征季节变化  

Seasonal Variations of Ecological Stoichiometry Characteristics of Major Plant Populations in Desert Steppe

作　　者：孙世贤[1] 运向军[1] 吴新宏[1] 卫智军 姜超[1] 刘文亭 

机构地区：[1]中国农业科学院草原研究所,内蒙古呼和浩特010020 [2]内蒙古农业大学草原与资源环境学院,内蒙古呼和浩特010019

出　　处：《生态环境学报》2018年第1期47-54,共8页Ecology and Environmental Sciences

基　　金：国家重点基础研究发展计划项目(973计划)(2014CB1388022);国家重点研发计划项目(2016YFC0500605);中央级公益性科研院所基本科研业务费项目(1810332014021)

摘　　要：以内蒙古高原荒漠草原为研究对象,对其主要植物种群短花针茅(Stipa breviflora)、无芒隐子草(Cleistogenes songorica)、碱韭(Allium polyrhizum)、银灰旋花(Convolvulus ammannii)、栉叶蒿(Neopallasia pectinata)的生态化学计量学特征进行了研究,探讨不同阶段主要植物种群的生态化学计量学特征及变异系数,揭示荒漠草原不同物种、不同发育阶段w(C)、w(N)、w(P)及其计量关系,以期为大尺度、大范围的生态化学计量学研究提供依据。结果表明,荒漠草原主要植物种群w(N)/w(P)均小于14,生长主要受到N素的限制。植物w(C)、w(C)/w(N)的季节变异范围较小,分别为2.58~14.09、14.85~29.92,表现出较强的内稳性;植物P的变异范围为26.39~51.56,植物N的变异范围为18.39~36.51,植物w(C)/w(N)、w(C)/w(P)的变异范围分别为14.85~29.92和26.29~43.38。短花针茅全氮的变异系数最大,为36.51%。无芒隐子草w(C)、w(P)、w(C)/w(P)和w(N)/w(P)的变异系数均为最高,分别为14.09%、51.56%、43.38%和37.19%。w(C)/w(N)的变异系数以短花针茅最高,为29.92%。各物种叶片w(N)、w(P)含量均表现出在生长初期显著大于其他生长时期(P<0.05),叶片w(C)表现为生长初期低于生长后期,叶片w(C)/w(N)和w(C)/w(P)随生长季推移逐渐升高。植物叶片w(C)、w(N)及w(C)/w(N)、w(C)/w(P)、w(N)/w(P)主要受植物种类的影响,其次为植物种类与月份之间的交互作用,最后为月份的影响,而植物w(P)含量主要受月份的影响。In this paper, the ecological stoichiometric characteristics of the main plant population of Stipa breviflora, Cleistogenes songorica, Allium polyrhizum, Convolvulus ammannii and Neopallasia pectinata were studied. To discusses main plant populations of ecological stoichiometry characteristics and coefficient of variation in different stages, revealing the desert grassland of different species, different development stage of C, N, P content and its measurement, for the large scale, a wide range of ecological stoichiometry study provides the basis. The main plant population of N/P was lower 14% in Stipa breviflora desert steppe. The main plant growth was limited by N. The seasonal variation of leaf C, N and P and C∶N, C∶P and N∶P mass ratios were also dramatically different. The coefficient of variation （CV） of leaf C, N and P contents and C∶N, C∶P and N∶P mass ratio was P （36.88%）〉C/P （33.97%）〉N/P （27.85%）〉N （23.81%）〉C/N （21.58%）〉C （6.17%）. The range of seasonal CV values for C and C/N was 2.58%~14.09%, 14.85%~29.92%, respectively, and P was 26.39%~51.56%, N was 18.39%~36.51%, C/N and C/P was 14.85%~29.92%, 26.29%~43.38%, respectively. The species of leaf N and P content showed significantly higher than in other seasons in the early stage of growth （P〈0.05）, and showed the leaf C content was lower than the growth in early growth stage, leaf C：N and C：P increased gradually with the growth time. Plant leaves C, N and C/N, C/P, N/P are mainly affected by plant species, followed by the interaction between plant species and months, and finally for the impact of the month, while the plant P content is mainly affected by the month.

关 键 词：荒漠草原 种群 化学计量学 季节变化 

分 类 号：Q948[生物学—植物学] X173[环境科学与工程—环境科学]