西北旱区典型灌草叶片性状沿气候梯度的变化

doi:10.13292/j.1000-4890.202112.002

生态学杂志 ›› 2021, Vol. 40 ›› Issue (12): 3769-3777.doi: 10.13292/j.1000-4890.202112.002

西北旱区典型灌草叶片性状沿气候梯度的变化

杨永^1,2,黄玥^1,2,卫伟^1*

（¹中国科学院生态环境研究中心城市与区域生态国家重点实验室，北京 100085； ²中国科学院大学，北京 100049）

出版日期:2021-12-10 发布日期:2022-05-10

Variations of leaf traits of typical shrub and herb species along a climate gradient in arid areas of Northwest China.

YANG Yong^1,2, HUANG Yue^1,2, WEI Wei^1*

(¹State Key Laboratory of Urban and Regional Ecology, Research Center for Ecoenvironmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; ²University of Chinese Academy of Sciences, Beijing 100049, China)

Online:2021-12-10 Published:2022-05-10

摘要/Abstract

摘要： 旱区植物叶片性状与环境因子关系的研究，对于准确揭示水资源匮乏地区的植物生存策略、调整与优化实践管理措施有重要参考价值。本研究基于样带调查和冗余分析等方法，定量刻画了西北旱区典型灌草植物叶片性状的变异程度，分析叶片性状对气候梯度的响应与适应机制。结果表明：（1）灌木植物平均叶面积、叶厚、比叶面积分别为136.77 mm²、0.41 mm、55.36 cm²·g^-1，草本植物平均叶面积、叶厚、比叶面积分别为351.45 mm²、0.31 mm、111.45 cm·g^-1，二者差异显著，且叶片大小和比叶面积是灌木和草本植物叶片性状变异的敏感因子。（2）灌木和草本植物的叶片性状对气候的响应规律具有相似性，整体表现为随干旱程度加剧，叶长、叶宽、叶面积和比叶面积变小，叶片厚度增大。（3）旱区灌木的气候敏感性显著高于草本。气候因子对灌木和草本植物叶片性状变异的解释分别为52%和12%，气候因子对叶片性状变异的影响能力排序为年平均降雨量>年平均潜在蒸散量>年平均温度。研究结果为揭示旱区植物对环境胁迫的响应机理提供依据。

关键词: 旱区植物, 叶片性状, 适应, 气候驱动, 冗余分析

Abstract: Identifying the relationship between leaf traits and environmental factors in arid areas will provide scientific guidance for revealing plant survival strategies and optimizing vegetation management practices in water-limited areas. Based on large-scale field investigations in arid regions of Northwest China, we quantitatively identified the variability of leaf traits of typical shrub and herb species, and explored the responses and adaptation mechanisms of leaf traits to variability of climate factors. The results showed that: (1) The average leaf area, leaf thickness, and specific leaf area of shrub species were 136.77 mm², 0.41 mm, and 55.36 cm²·g^-1, respectively, while the values for herb species were 351.45 mm², 0.31 mm, and 111.45 cm²·g^-1, respectively. There were significant differences in leaf traits between shrub and herb species, with leaf size and specific leaf area being more sensitive than other parameters. (2) Similar responses of leaf traits to the variability of climate factors were found in shrub and herb species. Leaf length, leaf width, leaf area, and specific leaf area decreased with increasing drought intensity, while leaf thickness showed an increasing trend. (3) The sensitivity of shrubs to climate variability was higher than that of herbs. Results of redundancy analysis showed that climatic factors accounted for 52% and 12% of the variation of leaf traits of shrub and herb species, respectively. Annual mean precipitation had higher effect on variability of plant leaf traits than annual mean potential evapotranspiration, while the latter had higher effect than annual mean temperature. Our results can help understand plant responses to environmental stress in arid areas.

Key words: dryland plant, leaf trait, adaptation, climate-driven, redundancy analysis.

杨永, 黄玥, 卫伟. 西北旱区典型灌草叶片性状沿气候梯度的变化[J]. 生态学杂志, 2021, 40(12): 3769-3777.

YANG Yong, HUANG Yue, WEI Wei. Variations of leaf traits of typical shrub and herb species along a climate gradient in arid areas of Northwest China.[J]. Chinese Journal of Ecology, 2021, 40(12): 3769-3777.

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西北旱区典型灌草叶片性状沿气候梯度的变化

Variations of leaf traits of typical shrub and herb species along a climate gradient in arid areas of Northwest China.

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