SHI Yu,WEN Zhong-ming,GONG Shi-hui,et al.Trait Variations along a Climatic Gradient in Hilly Area of Loess Plateau[J].Research of Soil and Water Conservation,2012,19(01):107-111,116.
黄土丘陵区植物功能性状沿气候梯度的变化规律
- Title:
- Trait Variations along a Climatic Gradient in Hilly Area of Loess Plateau
- 分类号:
- Q948
- 摘要:
- 选取黄土丘陵区延河流域147个物种，对10个与植物形态、生理相关的叶片和细根功能性状（叶大小、叶长宽比、叶厚度、叶干重、比叶面积、叶组织密度、叶氮含量、细根比根长、细根组织密度和细根氮含量）进行了测定，并对功能性状与气候因子的关系进行了分析。结果表明：（1）水热条件是影响研究区植物功能性状的重要因子，其中降雨为主导因子。物种水平上，植物功能性状随着环境的变化而变化，如叶氮含量随着温度指标（最冷月均温、生长季均温、年均温、最热月均温、温度季节变化的增加而增加；（2）不同生长型功能性状在环境梯度下存在差异，表现为草本植物相对木本植物有更小的叶组织密度以及更大的叶面积、比叶面积、叶片氮含量、根氮含量和比根长，表明不同生活型植物对环境的适应能力明显不同；（3）不同类群植物对环境条件变化的响应不同，表现为适应方式的分异和趋同。该结果为探究黄土高原植物对环境的适应机制提供理论依据。
- Abstract:
- More than 147 plant species in Yanhe River catchment in hilly area of Loess Plateau were selected and leaf area(LA), leaf length/leaf width(LW), leaf thickness(LT), leaf dry mass(DM), specific leaf area(SLA), leaf tissue density(LTD), leaf nitrogen concentration (LNC), specific root length (SRL), root tissue density (RTD) and root nitrogen concentration (RNC)) of 10 plant traits were determinated. Correlation analyses were used for quantifying relationships between plant traits and site climate. The results showed that: (1) functional traits of all species changed with environmental factors, and preciatation rather than temperature is the main control of trait differences along the gradient. As temperature index increased, LNC becomed higher; (2) large trait differences existed in growth forms. Grasses had higher mean LA, SLA, LNC, RNC, SRL and lower LTD than woody species, reflecting the adaptive differences of growth forms to environment; (3) trait variations of growth forms along a climatic gradient demonstrated an overall adaptation to environment, which were the combination strategies of co-evolution and divergent. The results of this research will provide basis for knowing adaptive mechanisms of plants to environment in hilly area of Loess Plateau.
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备注/Memo
收稿日期:2011-8-9;改回日期:2011-8-29。
基金项目:中国科学院重要方向项目（KZCX2-EW-406）；国家自然科学基金重点项目（40871246）
作者简介:施宇（1988- ），女，江苏靖江人，硕士研究生，主要从事植物对环境的适应策略研究。E-mail：shiyu@nwsuaf.edu.cn
通讯作者:温仲明（1969- ），男，陕西定边人，博士，副研究员，主要从事植物生态恢复重建研究。E-mail：zmwen@ms.iswc.ac.cn