沙棘属植物叶片碳稳定同位素含量与气候的关系  

Relationship between climate and leaf carbon stable isotope of Hippophae

作　　者：贺玲威 杨君珑[1] 李小伟[1] HE Ling-wei;YANG Jun-long;LI Xiao-wei(School of Agriculture,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学农学院,银川750021

出　　处：《应用生态学报》2021年第3期819-824,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(31860122,31560154);宁夏高等学校一流学科建设(草学学科)项目(NXYLXK2017A01);宁夏技术创新引导专项资助。

摘　　要：本试验以131个沙棘属植物种群为研究对象,通过测定其叶片碳稳定同位素(δ^(13)C)值,分析了碳稳定同位素特征与环境因子之间的关系。结果表明:沙棘属植物叶片的δ^(13)C值介于-24.65‰~-29.11‰,平均值为-26.97‰,属于C3植物,叶片δ^(13)C值变异系数为种内大于种间,表明环境因子是影响沙棘属植物叶片δ^(13)C含量变化的主导因素。沙棘属植物叶片的δ^(13)C值与经纬度的变化无显著相关,与海拔呈显著负相关。通过建立回归方程:δ^(13)C(‰)=0.118VAP-0.007GST-0.000028RDA-20.721(R^(2)=0.212,P<0.0001),说明影响沙棘属叶片δ^(13)C值最主要的因素是水蒸气压(VAP)、生长季温度(GST)和太阳辐射(RDA)。研究结果可为沙棘属植物对全球气候变化的响应提供理论依据。We analyzed the relationship between carbon stable isotope characteristics of 131 Hippophae populations and environmental factors by measuring the foliar δ^(13)C value in Hippophae. The results showed that the foliar δ^(13)C values of Hippophae ranged from^(-2)4.65‰ to-29.11‰, with an average of-26.97‰. Hippophae species were C3 plants. For the foliar δ^(13)C values, the coefficient variation at intraspecific level was higher than that at interspecific level, indicating that environmental factors should be main factors driving the variations of leaf δ^(13)C. The δ^(13)C values had no significant correlation with latitude and longitude, but were negatively correlated with altitude. The regression equation was δ^(13)C(‰)=0.118VAP-0.007GST-0.000028RDA-20.721(R^(2)=0.212,P<0.0001). Water vapor pressure(VAP), growing season temperature(GST), and radiation(RDA) were the major factors affecting foliar δ^(13)C values. Our results could provide a theoretical basis to understand the responses of Hippophae species to global climate change.

关 键 词：沙棘属植物 δ^(13)C值 碳稳定同位素 环境因子 

分 类 号：S793.6[农业科学—林木遗传育种]