云南松比叶面积和叶干物质含量随冠层高度的垂直变化规律  

Vertical variations in specific leaf area and leaf dry matter content with canopy height in Pinus yunnanensis

作　　者：张林[1] 罗天祥[1] 邓坤枚[1] 李文华[1] 

机构地区：[1]中国科学院地理科学与资源研究所

出　　处：《北京林业大学学报》2008年第1期40-44,共5页Journal of Beijing Forestry University

基　　金：美国林务局全球变化研究项目(05-IC-11242343-064)。

摘　　要：比叶面积(SLA)和叶干物质含量(LDMC)综合反应了植物利用资源的能力,是植物适应环境所体现出的关键叶性状。为深入了解SLA和LDMC沿冠层高度的垂直变化规律,该文对云南省永仁县万马乡2株云南松(树高14.4m,树龄29年;树高30.2m,树龄138年)不同冠层高度叶片SLA和LDMC进行调查研究,分析了不同年龄树木、不同叶龄SLA和LDMC的差异,初步探讨了SLA和LDMC在云南松冠层中的垂直空间分布。结果表明:①对于SLA,29年生云南松当年叶和1年叶比138年生云南松分别高27.66%和16.71%;对于LDMC,138年生比29年生分别高14.67%和5.10%;②SLA与LDMC成负相关;③各龄叶SLA随冠层高度的增加均具有对数递减趋势;④约在22m高度以下,LDMC随冠层高度的增加而增加;22m以上,当年叶LDMC呈现下降趋势,但1年叶变化不明显。研究结果指出,光照和水分资源在冠层不同高度的分配,共同导致SLA和LDMC沿冠层垂直方向发生变化。Specific leaf area （SLA） and leaf dry matter content （LDMC） are fundamental leaf traits reflecting the plant adaptation to environments, as well as the ability to utilize resources. In order to understand the vertical variations of SLA and LDMC along a canopy depth, the authors measured SLA and LDMC of both current and one-year-old leaves from the bottom to the top of 29- and 138-year-old （14.4 and 30.2 m in tree height, respectively） Pinus yunnanensis in Wanma Township of Yongren County, Yunnan Povince, southwestern China. Differences in SLA and LDMC were analyzed between current and one-year-old leaves and between 29- and 138-year-old pine trees associated with sampled canopy height. The results indicated that： 1 ） SLA of current and one-year-old leaves in 29-year-old pine was 27.66% and 16.71% higher than those of 138-year- old pine,while the LDMC of current and one-year-old leaves in 138-year-old pine was 14.67% and 5.10% higher than those of 29-year-old pine. 2） SLA logarithmically decreased with the increase LDMC. 3） As canopy height increased, SLA generally declined, whereas LDMC increased when the height was lower than 22 m, but decreased for the current leaves and varied insignificantly for one-year-old leaves above the height threshold. The results suggest that the vertical variations of SLA and LDMC could be explained by the general light distribution and water allocation along a canopy depth.

关 键 词：比叶面积 叶干物质含量 云南松 冠层高度 

分 类 号：S718.51[农业科学—林学]