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普定喀斯特地区不同演替阶段植物群落凋落物动态

ISSN号：1000-4890
期刊名称：生态学杂志
时间：2013
页码：802-806
分类：Q948.1[生物学—植物学]
作者机构：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002, [2]中国科学院大学,北京100049, [3]中国科学院普定喀斯特生态系统观测研究站,贵州普定562100, [4]贵州师范大学地理与环境科学学院,贵阳550001
相关基金：国家重大科学研究计划项目（2013CB956700）、国家自然科学基金创新群体项目（40721002）、中国科学院战略性先导科技专项（XDA05070400）、中国科学院“西部之光”人才项目和贵州省社会发展科技攻关计划项目（黔科合sY字E201213011号）资助.
相关项目：西南喀斯特流域物质循环的生物地球化学过程与生态环境效应

关键词：凋落物, 喀斯特, 植被, 普定, litterfall , Karst , vegetation , Puding of Guizhou.

中文摘要：

凋落物是陆地生态系统碳收支和物质循环的重要组成部分。本研究于2011年3月-2012年2月对普定喀斯特区6个演替阶段（稀灌草丛、藤刺灌丛、灌木林、乔灌过渡林、次生乔木林以及原生乔木林）植物群落的凋落物生物量、组分（叶、枝、花果等）、月动态进行了定位观测。结果表明：6个演替阶段群落年均总凋落量分别为789．5、3821．8、4315．0、4158．8、4201．0和3950．4kg·hm^-2；随着群落正向演替的推进，植物群落凋落物量表现为先升高后缓慢下降最后趋于稳定。叶凋落量占总凋落量的59．0％～77．7％，枝凋落量占7．9％～24．0％，花果等凋落量占5．4％～24．0％，叶凋落量比例随群落正向演替递减，枝凋落量与群落演替阶段显著正相关。原生乔木林、灌木林和稀灌草丛群落凋落物的月变化规律为单峰型，其余3个演替群落凋落物的月变化规律均为双峰型；叶凋落物的月动态与总凋落物一致。

英文摘要：

Litterfall is an important component of carbon budget and material cycling in terrestrial ecosystems. In this paper, an observation was conducted on the monthly dynamics of the biomass of litterfalls and their components （leaf, branch, and flower and fruit） from the plant communi- ties at six succession stages （sparse-shrub tussock, thorny shrub, shrub, shrub-tree transitional forest, secondary forest, and primary forest） in the Puding Karst area of central Guizhou Province from March 2011 to February 2012. At the six succession stages, the mean annual litterfall bio- mass was 789.5, 3821.8, 4315.0, 4158.8, 4201.0, and 3950.4 kg · hm-2, respectively. With the forward succession of the communities, the litterfall biomass increased first, decreased gradually then, and tended to be stable lastly. The biomass of the litterfall components （leaf, branch, and flower and fruit） accounted for 59.0% -77.7% , 7.9% -24.0% , and 5.4% - 24. 0% of the total, respectively. With the forward succession, the biomass of leaf litterfall de- creased while that of branch litterfall increased. The monthly variation pattern of the litterfall of sparse-shrub tussock, shrub, and primary forest was of unimodal type, while that of the other three succession communities was of bimodel. The leaf litterfall biomass showed a consistent monthly dynamic with the total litterfall.