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南方灌草丛典型灌木不同叶片性状的相关性及其对不同光环境的响应

高景1,2,徐波1,2,王金牛1,3**,周海燕4,王彦星1,2,吴彦1**   

  1. 1中国科学院成都生物研究所/中国科学院山地生态恢复与生物资源利用重点实验室/生态恢复与生物多样性保育四川省重点实验室, 成都 610041; 2中国科学院大学, 北京 100049; 3国际山地综合发展中心, 加德满都; 4四川省内江市农业科学院, 四川内江 641000)
  • 出版日期:2015-09-10 发布日期:2015-09-10

Correlations among leaf traits of typical shrubs and their responses to different light environments in shrubgrassland of southern China.

GAO Jing1,2, XU Bo1,2, WANG Jing-niu1,3**, ZHOU Hai-yan4, WANG Yan-xing1,2, WU Yan1**   

  1. (1Chengdu Institute of Biology, Chinese Academy of Sciences/Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chinese Academy of Sciences/Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu 610041, China; 2 University of Chinese Academy Sciences, Beijing 100049, China; 3 International Centre for Integrated Mountain Development (ICIMOD), Kathmandu, Nepal; 4 Sichuan Province Neijiang City Academy of Agricultural Sciences, Neijiang 641000, Sichuan, China)
  • Online:2015-09-10 Published:2015-09-10

摘要: 光照是影响植物生长和分布的重要环境因子,而叶片结构相对稳定,其性状对植物的碳收获非常重要,并且各性状间的相互关系格局相似,通过叶片性状有助于研究植物对不同光环境的响应及生态适应策略。本研究分析了南方灌草丛3种典型灌木——巴柳(Salix etosia)、川莓(Rubus setchuenensis)和马桑绣球(Hydrangea aspera)的叶片性状(单叶面积、叶干重、比叶面积、叶碳含量、叶氮含量、叶磷含量)之间的相关性以及在林内林外2种不同光环境下叶片性状的差异,探讨不同植物叶片性状在不同光环境下的响应及适应策略。结果表明:1)3种灌木叶片性状之间的相关性差别较大,具有物种特异性。2)巴柳叶片性状在不同光环境下无显著差异,川莓和马桑绣球均提高了林内叶片的比叶面积和叶氮含量以适应弱光环境,且马桑绣球叶碳含量在林内显著增加,表现出较强的固碳能力。3)不同光环境中,影响川莓和马桑绣球叶片性状变化的主要环境因子均为土壤温度。研究结果进一步揭示了植物叶片性状具有表型可塑性,不同植物对环境变化的响应及适应策略具有物种特异性。

关键词: 海拔, 酶活性, 有机碳矿化, 代谢熵, 年均温, 微生物熵

Abstract: It is widely accepted that light, one of the critical environmental factors, affects growth and distribution of plants. Leaf traits, which are of crucial importance to capture carbon, are generally consistent across environmental gradients. There are also similar patterns of correlations among different leaf traits, so it is essential to explore how leaf traits respond to and adapt to different light environments for a comprehensive understanding of ecosystem management. Our study aimed to investigate leaf traits and their correlations inside and outside the forests of three typical shrubs (i.e. Salix etosia, Rubus setchuenensis and Hydrangea aspera) in shrubgrassland of southern China. Field sampling survey was carried out to collect leaves under different light environments (inside and outside the forests) in Yunyang County. The results showed that the correlations among leaf traits of three shrubs vary one to another, i.e. speciesspecific. There was no significant difference in leaf traits of S. etosia under different light environments, while significant differences in leaf traits were found for R. setchuenensi and H. aspera. Both SLA and LNC of R. setchuenensi and H. aspera increased inside the forests for adapting to lower illuminance. In addition, LCC of H. aspera increased significantly inside the forests, which indicated a relatively strong carbon fixation capacity. Leaf traits of R. setchuenensis and H. aspera were mainly affected by soil temperature under different light environments. Our study demonstrated that there existed the phenotypic plasticity for plant leaf traits, and different plants had speciesspecific responses as well as strategies to adapt to different environments.

Key words: soil organic carbon mineralization, soil metabolic quotient, microbial quotient, mean annual temperature, elevation, enzymatic activity