宁夏针茅属植物叶片碳稳定同位素特征及其影响因素  

Characteristics and Influencing Factors of Stipa Leaf Carbon Stable Isotope in Ningxia

作　　者：刘万弟 李小伟[1] LIU Wan-di;LI Xiao-wei(School of Agriculture,Ningxia University,Yinchuan,Ningxia 750021,China)

机构地区：[1]宁夏大学农学院,宁夏银川750021

出　　处：《草地学报》2022年第8期2058-2065,共8页Acta Agrestia Sinica

基　　金：宁夏自然科学基金(2021AAC03085);国家自然基金(31560154);宁夏高等学校一流学科建设(草学学科)资助项目(NXYLXK2017A01);宁夏草原检测项目(2020)资助。

摘　　要：植物叶片δ^(13)C自然丰度能够揭示植物对环境的适应策略。本研究分析了宁夏6种针茅属植物叶片δ^(13)C与环境因子的关系,并量化了气候与土壤因子对δ^(13)C的影响程度,结果表明:宁夏针茅属植物叶片δ^(13)C范围为-28.07‰~-24.56‰,均值为-26.31‰,其中,戈壁针茅δ^(13)值最大(-25.91‰),沙生针茅最小(-27.96‰);δ^(13)C与经度呈显著负相关,随纬度和海拔增加呈先上升后下降趋势;土壤因子单独解释量为32.87%,气候因子单独解释了7.54%,二者共同解释量为34.17%。通过蒙特卡洛检验,土壤全磷(TP)是影响针茅叶片δ^(13)C的最主要因素,土壤全磷与δ^(13)C呈显著正相关,年均温(MAT)、太阳辐射量(SRAD)、土壤容重(BD)与δ^(13)C显著负相关。本研究结果可为揭示温性草原针茅属植物响应气候变化的适应策略及大尺度研究提供基础数据支持。Plant leafδ^(13)C can reveal the adaptation strategies of plants to environment.In this study,we analyzed the relationship between leafδ^(13)C and environmental factors of Stipa,and quantified the influence of climate and soil factors onδ^(13)C.The results showed that:δ^(13)C of leaf of Ningxia Stipa ranged from-28.07‰to-24.56‰,with a mean value of-26.31‰.Among which,δ^(13)C value of Stipa tianschanica var.gobica and S.caucasica subsp.glareosa were the largest(-25.91‰)and the smallest(-27.96‰),respectively.δ^(13)C value first was increased and then decreased with the increase of latitude and altitude.Soil factor alone,climate factor alone,and the interaction respectively explained 32.87%,7.54%,34.17%variation ofδ^(13)C value across all species.Soil total phosphorus(TP)was the most important factor affecting theδ13C of Stipa,by Monte Carlo test.TP was significantly positively correlated withδ^(13)C,whereas mean annual temperature(MAT),solar radiation(SRAD)and soil bulk density(BD)were significantly negatively correlated withδ^(13)C.The results of this study reveal the adaptation strategies of Stipa in response to climate change in temperate steppe,and provide basic data support for large-scale studies.

关 键 词：针茅属植物 δ^(13)C值 碳稳定同位素 环境因子 

分 类 号：S945[农业科学—水产养殖]