黄土高原两种针叶树种不同器官水碳氮磷分配格局及其生态化学计量特征  

Distribution patterns and ecological stoichiometry of water, carbon, nitrogen and phosphorus in different organs of two conifer species on the Loess Plateau

作　　者：陈美玲 崔君滕 邓蕾 王凯博[2,3] CHEN Meiling;CUI Junteng;DENG Lei;WANG Kaibo(Qingdao Forestry Investment and Development Co.,Ltd,Qingdao 266061,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences&Ministry of Water Resources,Yangling 712100,China)

机构地区：[1]青岛林业投资开发有限公司,青岛266061 [2]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710061 [3]中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌712100

出　　处：《地球环境学报》2018年第1期54-63,共10页Journal of Earth Environment

基　　金：国家自然科学基金资助项目(41671511;41301610);黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金(A314021402-1716);黄土与第四纪地质国家重点实验室开放基金(SKLLQG1506)~~

摘　　要：植物不同器官水、碳、氮、磷等元素含量及其生态化学计量特征能够反映植物的生态策略及其环境适应性。本研究以黄土高原两种乡土树种油松(Pinus tabulaeformis)和柴松(Pinus tabulaefirmis f.shekanensis)为研究对象,分析了研究区两种树种水、碳、氮和磷在不同器官的含量及其生态化学计量特征,探讨了两种树种基于水、碳、氮和磷分配格局的生态适应策略。结果表明:(1)油松和柴松对水分和碳素的分配格局总体表现为根和叶最大,其次为枝和干,树皮最小;对氮、磷的分配格局则表现为叶片显著高于其他器官。(2)油松将更多的水和氮分配给叶、根等生产性器官,而柴松将更多的水和碳分配给枝、干等防御性器官,反映了柴松较油松具有更加保守的生长策略,能够更好适应逆境条件。(3)植物器官不同元素间通过相互耦合后可以表现出较好的相关性,反映了植物元素之间具有高度复杂的协同关系,这种协同关系的体现形式可能与植物类型及其对外界环境变化的生长适应策略密切相关。Background,aim,and scope Stoichiometry is one of the hotspots in currently ecological study that it mainly focuses on the mass balance of multiple chemical elements in living systems.The contents of water,carbon,nitrogen and phosphorus in different organs of plants and their ecological stoichiometry can reflect the ecological strategy and environmental adaptability of plants.In this study,two native species of Pinus tabulaeformis and Pinus tabulaefirmis f.shekanensis on the Loess Plateau were taken as research target,and the contents of water,carbon,nitrogen and phosphorus in different organs and their ecological stoichiometry were analyzed to investigate the ecological adaptation strategies of the two coniferous species.Materials and methods A 20 m×20 m standard plots were established in both P.tabulaeformis and P.tabulaefirmis f.shekanensis community when the plant biomass peaked.Five standard trees that can represent the average growth of trees within each plot were selected to collect the samples of leaf,branch,bark and stem of each species.And the roots in 0-20 cm soil depth of the two communities were sampled by using a 9 cm diameter root corer.All the plant organic samples were oven-dried at 65℃and weighed to within 0.01 g.The contents of water,carbon,nitrogen and phosphorus in different organs were analyzed referring to Lu(2000).The one-Way analysis of variance(ANOVA),Pearson correlation analysis and regression analysis among all the elements and their ratio in each organic of the two species were conducted by SPSS 16.0,and LSD test was used for multiple comparison tests.Results The water,carbon,nitrogen,and phosphorus content in each organic of the two species ranged from 207‰to 625‰,434.0 g.kg-1 to 596.8 g.kg-1,1.1 g.kg-1 to 13.0 g.kg-1 and 1.3 g.kg-1 to 2.4 g.kg-1.The distribution pattern of water and carbon in different organs of P.tabulaeformis and P.tabulaefirmis f.shekanensis was the highest in roots and leaves,followed by branches and roots,and the bark was the smallest;and the nitrogen and

关 键 词：油松 柴松 器官 生态化学计量 适应策略 

分 类 号：Q948.1[生物学—植物学]