Vol.38,No.14 Jul.,2018 http: / / www.ecologica.cn 基金项目:国家自然科学基金项目(U1503187) ; " 十二五" 农村领域国家科技计划课题(2015BAD07B03•03) ; 新疆维吾尔自治区教育厅研究生 科研创新项目(XJGRI2017021) ;2017 年新疆林业科技项目 收稿日期:2017• 07• 11; 网络出版日期:2018• 04• 04 * 通讯作者 Corresponding author.E•mail: ecocsl@ 163.com DOI: 10.5846 / stxb201707111254 孙雪娇, 常顺利, 张毓涛, 李吉玫.天山森林植物功能性状与碳库沿海拔梯度的变化.生态学报,2018,38(14) :4994• 5005. Sun X J, Chang S L, Zhang Y T, Li J M. The variations in plant functional traits and forest carbon content with altitudinal gradients in the Tianshan Mountains.Acta Ecologica Sinica,2018,38(14) :4994• 5005. 天山森林植物功能性状与碳库沿海拔梯度的变化 孙雪娇 1 , 常顺利 1, * , 张毓涛 2 , 李吉玫 2 1 新疆大学资源与环境科学学院绿洲生态教育部重点实验室, 乌鲁木齐 830046 2 新疆林科院森林生态研究所,乌鲁木齐 830063 摘要:植物功能性状是能够将植物个体特征、群落结构和生态系统功能结合起来的良好载体,但关于在环境梯度上如何通过植 物功能性状的连续变化来构建群落、以及植物功能性状如何反映生态系统功能等问题尚有较多疑问。 为探讨天山森林植物功 能性状与其碳库在海拔梯度上的联系,分析了 14 个群落尺度上的植物功能性状指标和各组分碳密度沿海拔的变化规律及二者 之间的关系。 结果表明:(1) 受海拔梯度上环境因子的影响,群落尺度上植物功能性状和碳密度的垂直分布并不一致:随海拔 升高,叶片碳氮比(C / N) 逐渐上升,叶片碳含量(C leaf) 、比根长(SRL) 和植株高度(H) 升高后降低,叶绿素含量(Chl) 、细根磷含 量(P root) 、叶片氮磷比(N / P) 逐渐下降,细根碳含量(C root) 先升高后趋于平缓,细根氮含量(N root) 先下降后又有所回升,叶片氮 含量(N leaf) 、木质素含量(LLC) 、叶干物质含量(LDMC) 、细根干物质含量(RDMC) 在各海拔段间无显著差异;(2) 比根长(SRL) 和植株高度(H) 通过影响资源的获取和利用,C 与 P 通过对养分的限制和在器官中的分配,从而影响植被光合作用,与天山森 林碳密度显著相关;高木质素含量(LLC) 导致植物残体分解速率变慢而与土壤碳密度(SCD) 和群落总碳密度(TCD) 呈显著负 相关关系。 随海拔升高,植被碳密度(VCD) 先升后降,土壤碳密度(SCD) 和总碳密度(TCD) 逐渐升高。 植物功能性状与环境因 子和森林的结构功能相互作用、相互影响,三者之间的关系还需在大尺度上进一步验证。 关键词:植物功能性状;碳密度;海拔梯度;天山;云杉森林 The variations in plant functional traits and forest carbon content with altitudinal gradients in the Tianshan Mountains SUN Xuejiao 1 , CHANG Shunli 1, * , ZHANG Yutao 2 , LI Jimei 2 1 Key Laboratory of Oasis Ecology, College of Resource and Environment Science, Xinjiang University, Urumqi 830046,China 2 Institute of Forest Ecology, Xinjiang Academy of Forestry, Urumqi 830063,China Abstract: Plant functional traits are important characteristics for understanding the relationship between individual, community, and ecosystem functions. In the present study, we established 43 sample sets to examine 12 types of plant functional traits and corresponding carbon density information at the community scale. The objective of this work was to determine the internal relationship between the adaptive variation in functional traits and the carbon density of forest communities along an elevation gradient. The results show that at a higher altitude, the carbon to nitrogen ratio (C / N) in leaves increased linearly, whereas carbon content (C leaf) , specific root length (SRL) , and height (H) initially increased and then decreased. Chlorophyll content (Chl) and fine root phosphorus content (P root) decreased with elevation and fine root carbon content (C root) initially increased and then flattened out with altitude. Fine root nitrogen content (N root) initially decreased and then increased, whereas leaf nitrogen content (N leaf) , lignin content (LLC) , and fine root dry matter
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