内蒙古草地植被δ^13C空间格局及其对气候因子的响应  

Spatial Pattern of Foliar δ^(13)C in C_3-dominated Grasslands and Its Responses to Climatic Factors in Inner Mongolia of China

作　　者：周咏春[1] 程希雷 樊江文[3] 徐新阳[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]辽宁省环境科学研究院,辽宁沈阳110031 [3]中国科学院地理科学与资源研究所陆地表层格局与模拟重点实验室,北京100101

出　　处：《东北大学学报（自然科学版）》2016年第2期273-278,284,共7页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(31400413);中央高校基本科研业务费专项资金资助项目(N130301001);辽宁省博士启动基金资助项目(20141017);国家重点基础研究发展计划项目(2010CB950902);国家科技支撑计划项目(2013BAC03B04)

摘　　要：为了探明内蒙古草地植物叶片δ13C的空间格局及其对气候因子的响应,于植物生长最旺盛的8月,在内蒙古共采集来自47个样地的126个C3植物样品,利用GPS记录每个样地的地理参数,并从全国陆地生态信息气象栅格数据库中提取每个样地的气象信息,在实验室利用同位素质谱仪测定叶片13C/12C.研究发现,C3植物叶片δ13C随海拔升高而增大,随经纬度的增加而减小;降水和大气压强与叶片δ13C显著负相关,它们共同决定了叶片δ13C的空间格局,其中水分是主导因素;温度对叶片δ13C没有显著影响.In order to explore the pattern and climatic control of foliar δ^13C,126 samples of C3-plant species were collected from 47 areas in the Inner Mongolia during its August prosperous season. The geographic parameters of each site were recorded by GPS,and climatic information of each site was extracted from Meteorological Database of the Chinese Ecological Research Network. Foliar13 C /12 C ratios were determined by an isotope mass spectrometer. The results showthat the increasing trend of C3-plant foliar δ13C excursion changes positively with the increase of altitude,but negatively with the increase of longitude and latitude degrees. Climatic factors controlling the C3-plant foliar δ13C variations are mainly involved in the amount of seasonal rainfall and atmospheric pressure,as well in negative relationships,which control spatial distribution of the C3-plant foliar δ13C. In addition,variations of foliar δ13C shownothing in trend of the temperature changes here.

关 键 词：叶片δ^13C 草地 C3植物 空间格局 气候因子 内蒙古 

分 类 号：X171.1[环境科学与工程—环境科学] Q948.1[生物学—植物学]