太白山石生苔藓碳同位素分布特征及其环境指示意义

doi:10.13866/j.azr.2016.05.19

摘要/Abstract

摘要： 关于植物δ¹³C值对海拔变化的响应特征及其机理的研究存在不同的认识,且很难找到一种出现在各个海拔高度的植物来减少种间出现的碳同位素分馏的差异。苔藓植物由于其结构相对简单,对环境变化的反应较为敏感,且随海拔梯度分布范围较广,因此,是一类良好的指示植物。通过对太白山南北坡不同海拔高度石生苔藓碳同位素组成(δ¹³C)以及各环境因子和石生苔藓碳同位素随海拔关系的分析,结果显示:太白山南北坡石生苔藓δ¹³C与海拔呈显著线性相关(南坡R²= 0.45,P<0.01;北坡R²=0.31,P<0.01)。海拔每升高1 000 m,南北坡石生苔藓δ¹³C值分别增加2.0‰和1.1‰。同时,大气CO₂浓度及其碳同位素组成、大气压、降水量、生物量等各因子对石生苔藓碳同位素组成记录的海拔效应影响较小,温度很可能是导致太白山石生苔藓δ¹³C海拔效应的主要因素。

关键词: 石生苔藓, 环境意义, 碳同位素, 海拔高度, 太白山

Abstract: There are the congnitive differences in the response and mechanism of plant δ¹³C to altitude. Furthermore,it is difficult to find a plant species growing at different altitudes to reduce carbon isotope fractionation difference between species. Bryophytes are the good bioindicator plants with their relative simple structure,high sensitivity to environmental change,and wide distribution with altitude gradient. However,the effect of altitude change and environmental change on carbon isotope of bryophytes was discussed in few researches only. In this paper,carbon isotope composition (δ¹³C) of epilithic mosses at different altitudes in the north and south slopes of the Mount Taibai was analyzed. The effect of environmental factors on the relationship between carbon isotope of epilithic mosses and altitude was also discussed. A significant linear correlation between δ¹³C of epilithic mosses and altitude in the north and south slopes of the Mount Taibai was found (south slope:R²= 0.45 and P<0.01; north slope:R²=0.31 and P<0.01). The δ¹³C of epilithic mosses in the north and south slopes of the Mount Taibai increased by 2.0‰ and 1.1‰ when the altitude increased by 1 000 m. Moreover,the effect of atmospheric CO₂ concentration and its carbon isotope composition,atmosphere pressure,precipitation,biomass,etc. on the response of carbon isotope composition of epilithic mosses to altitude was low. Temperature may be the main factor affecting δ¹³C of epilithic mosses in the Mount Taibai.

Key words: epilithic moss, environmental significance, stable carbon isotope, altitude, Mount Taibai

张普, 丁宗巨, 侯瑶瑶, 白红英, 任晓倩, 赵佩. 太白山石生苔藓碳同位素分布特征及其环境指示意义[J]. 干旱区研究, 2016, 33(5): 1046-1056.

ZHANG Pu, DING Zong-ju, HOU Yao-yao, BAI Hong-ying, REN Xiao-qian, ZHAO Pei. Distribution of Carbon Isotope Composition of Epilithic Mosses and Their Environmental Significance in the Mount Taibai,China[J]. Arid Zone Research, 2016, 33(5): 1046-1056.

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