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当前位置: 首页 > 文章 > 桂西北喀斯特坡地不同演替阶段典型植物碳同位素组成差异 中国生态农业学报 2010,18 (6) 1223-1227
Position: Home > Articles > Leaf δ~(13)C of plants in different vegetation succession stages on karst hillslope of Northwest Guangxi, China Chinese Journal of Eco-Agriculture 2010,18 (6) 1223-1227

桂西北喀斯特坡地不同演替阶段典型植物碳同位素组成差异

作  者：
谭巍;陈洪松;王克林;聂云鹏;邓彭艳
单  位：
中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室
关键词：
桂西北;喀斯特坡地;植被演替;植物叶片;δ13C值;水分利用效率
摘  要：
通过测定9种典型植物的叶片δ13C值,比较了桂西北喀斯特坡地不同植被演替阶段(灌草丛、灌丛、次生林)植物叶片δ13C值的差异及其季节变化。结果表明,雨季(2009年7月)3个演替阶段间整体植物叶片δ13C值无显著差异;旱季(2009年11月)灌丛植物叶片δ13C值显著高于次生林(P<0.05),且高于灌草丛,但差异不显著;灌草丛与次生林植物叶片δ13C值相近。以生活型分类分析,旱季乔木植物叶片δ13C值在3个演替阶段差异不显著,灌木和草本叶片δ13C值为灌丛高于次生林,且差异接近显著水平(P分别为0.063和0.074)。旱季和雨季对比中,灌丛植物叶片δ13C值旱季显著高于雨季(P<0.05),灌草丛、次生林的旱季和雨季对比差异不显著。3个演替阶段的乔木叶片δ13C值旱季与雨季差异均不显著,灌丛阶段的草本植物和灌草丛阶段的灌木植物叶片δ13C值旱季显著高于雨季。说明季节性降雨变化对灌丛植物水分利用效率的影响大于对灌草地和次生林的影响,这主要是通过影响灌木和草本植物叶片δ13C值实现的。
译  名：
Leaf δ~(13)C of plants in different vegetation succession stages on karst hillslope of Northwest Guangxi, China
作  者：
TAN Wei1,2,3, CHEN Hong-Song1,2, WANG Ke-Lin1,2, NIE Yun-Peng1,2,3, DENG Peng-Yan1,2 (1. Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; 2. Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang 547100, China; 3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
关键词：
Northwest Guangxi, Karst hillslope, Vegetation succession, Leaf δ13C value, Water use efficiency
摘  要：
Leaf δ13C of nine dominant plant species in grass-shrub stage, shrub stage and forest stage on karst hillslope of Northwest Guangxi was measured to learn leaf δ13C seasonal changes and variation among different vegetation succession stages. The results show that plant leaf δ13C of three vegetation succession stages have no significant difference in wet season (July, 2009), while it is significantly higher in shrub stage than that in forest stage (P<0.05), and a little higher than that in grass-shrub stage (P>0.05) in dry season (Nov., 2009). Meantime, plant leaf δ13C in grass-shrub stage is similar to that in forest stage in dry season. In consideration of life forms, leaf δ13C of trees is not significantly different in three vegetation succession stages, however that of shrubs and grasses is higher in shrub stage than in forest stage (P=0.063, 0.074) in dry season. Plant leaf δ13C of shrub stage is higher in dry season than in wet season (P<0.05). Not significant difference is observed in plant leaf δ13C of grass-shrub and forest stages between dry and wet seasons. Tree leaf δ13C in three succession stages are not significantly different in dry and wet seasons. Those of shrubs in grass-shrub stage and grasses in shrub stage are significantly higher in dry season than those in wet season. This indicates that sea-sonal change in rainfall greatly influences water use efficiency of plants in shrub stage than in other vegetation succession stages, which mainly results from rainfall effect on leaf δ13C of shrubs and grasses.

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