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河西走廊荒漠区不同功能类群植物叶片建成成本的比较

Comparison on leaf construction cost of different plant groups in the desert area of the Hexi Corridor
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摘要 叶片建成成本(LCC)是构建单位质量或面积叶片投入能量成本的衡量指标,其差异与变化能够反映植物的能量利用策略和环境适应特征。该研究假设:不同功能类群的荒漠植物具有不同的叶片能量利用策略,从而有利于其适应干旱环境。为验证这一假设,该研究以河西走廊荒漠区主要荒漠植物为研究对象,比较了LCC在不同生态系统和不同植物功能类群之间的差异,分析了LCC和其他叶片性状之间的关系,以及LCC随环境因子的变化规律。结果表明:荒漠生态系统中植物单位质量的LCC显著低于森林、苔原和草地生态系统;在荒漠生态系统中,肉质植物单位质量LCC显著低于非肉质植物,而单位面积LCC在两种植物类群间无显著差异;叶片碳、氮含量,热值以及灰分含量与LCC之间的相关关系说明灰分含量是影响肉质植物和非肉质植物之间LCC差异的内在决定因素;环境因子对单位质量LCC空间变异的贡献非常有限(肉质植物:11.22%,非肉质植物:25.30%,所有植物:24.99%),并且6个环境因子中只有土壤电导率、年平均气温和年降水量表现出显著的独立贡献;肉质植物单位质量LCC随年平均气温的降低而减小,非肉质植物单位质量LCC随年降水量和年平均气温的降低而减小。该研究的结果表明,降低单位质量而非单位面积的LCC更加有利于植物适应干旱、高盐的荒漠生境。 Aims Leaf construction cost(LCC)is a measure of the energy cost of building leaves per unit mass or area.Its differences and changes can reflect the energy utilization strategies and environmental adaptation characteristics of plants.This study assumes that desert plants of different functional groups have different leaf energy utilization strategies,which are conducive to their adaptation to arid environments.Methods Taking the main desert plants in the desert area of the Hexi Corridor as the research object,the differences of LCC in different ecosystems and different plant functional groups were compared,and the relationships between LCC and other leaf traits were analyzed,as well as the change of LCC with environmental factors.Important findings LCC of plant unit mass in this desert ecosystem was significantly lower than that in forest and grassland ecosystems.In desert ecosystems,LCC per unit mass of succulent plants is significantly lower than that of non succulent plants,while LCC per unit area has no significant difference between the two plant groups.The correlations between leaf carbon,nitrogen contents,calorific value and ash content and LCC indicate that ash content is the internal determinant of LCC difference between succulent plants and non succulent plants.The contribution of environmental factors to the spatial variation of unit mass LCC is very limited(11.22% for succulent plants,25.30% for non succulent plants,and 24.99% for all plants),and only soil conductivity,annual mean air temperature,and annual precipitation among the six environmental factors show significant independent contributions.LCC per unit mass of succulent plants decreases with the decrease of annual average temperature,while LCC per unit mass of non succulent plants decreases with the decrease of annual precipitation and annual mean air temperature.The results of this study show that reducing the cost of leaf construction per unit mass rather than per unit area is more beneficial for plants to adapt to drought and high salt desert habitats.
作者 赵镇贤 陈银萍 王立龙 王彤彤 李玉强 ZHAO Zhen-Xian;CHEN Yin-Ping;WANG Li-Long;WANG Tong-Tong;LI Yu-Qiang(School of Environment and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)
出处 《植物生态学报》 CAS CSCD 北大核心 2023年第11期1551-1560,共10页 Chinese Journal of Plant Ecology
基金 国家自然科学基金(32260316和31971466)。
关键词 叶建成成本 荒漠植物 植物功能类群 叶性状 环境因子 leaf construction cost desert plant plant functional group leaf trait environmental factor
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