摘要
植物的稳定碳同位素组成(δ13 C)能反映植物对干旱环境的适应能力。为研究荒漠草原区猪毛蒿(Artemisia scoparia)的生存策略,本研究以猪毛蒿为试验对象,分析了猪毛蒿同化枝δ13 C值与土壤因子,种群数量特征,以及猪毛蒿个体生物量分配间的关系。结果表明:猪毛蒿同化枝δ13 C值分布为—29.76‰~—25.10‰。试验区内土壤体积含水率、土壤硬度对猪毛蒿同化枝δ13 C的影响不显著。δ13 C值与密度呈显著负相关关系(P<0.05),与盖度、株高和冠幅呈极显著正相关关系(P<0.01)。δ13 C值与营养器官生物量、繁殖器官生物量、地上生物量、地下生物量和总生物量均呈极显著正相关关系(P<0.01);猪毛蒿营养器官生物量与繁殖器官生物量呈极显著正相关(P<0.01)。综上可得,猪毛蒿同化枝δ13 C值与植株种群数量特征、个体生物量分配存在明显的相关性,表明猪毛蒿为适应荒漠草原环境,能够采取独特的生存适应策略。
The stable carbon isotope composition(δ13 C)of plants reflects the adaptability of plants to drought environment.To study the survival strategy of Artemisia scoparia in desert steppe region,Artemisia scoparia was used as the test object,and the relationship amongδ13 C values,the soil factors,quantitative characteristics of population,and individual biomass allocation of Artemisia scoparia were analyzed.The results showed that theδ13 C values of assimilation branch of Artemisia scoparia was distributed at—29.76‰~—25.10‰.The volumetric water content of soil and soil hardness had no significant effect on theδ13 C values of assimilation branch of Artemisia scoparia.The correlation ofδ13 C values with density was significantly negative(P<0.05).The relationships ofδ13 C values with coverage,plant height and crown width was significantly positive(P<0.01).Theδ13 C values were significantly positively correlated with vegetative organ biomass,reproductive organ biomass,aboveground biomass,underground biomass and total biomass(P<0.01).There was a significantly positively correlation between vegetative organ biomass and reproductive organ biomass of Artemisia scoparia(P<0.01).In summary,there was a clear correlation among theδ13 C values of assimilation branch of Artemisia scoparia,quantitative characteristics of population,and individual biomass allocation,indicating that Artemisia scoparia had an unique survival adaptation strategy to the desert steppe environment.
作者
苏莹
陈林
李月飞
孟文婷
祝忠有
袁闯
王诗雅
朱林
SU Ying;CHEN Lin;LI Yue-fei;MENG Wen-ting;ZHU Zhong-you;YUAN Chuang;WANG Shi-ya;Zhu Lin(Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China,Ningxia University,Yinchuan,Ningxia 750021,China;Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education,Ningxia University,Yinchuan,Ningxia 750021,China;College of Agriculture,Ningxia University,Yinchuan,Ningxia 750021,China)
出处
《草地学报》
CAS
CSCD
北大核心
2019年第4期859-866,共8页
Acta Agrestia Sinica
基金
国家自然科学基金项目(31460123,31460161,41461046)
国家重点研发计划(2016YFC0500709)
宁夏自然科学基金(2018AAC03037)资助
关键词
荒漠草原
猪毛蒿
稳定碳同位素组成
生态适应
土壤水分
生物量分配
Desert steppe
Artemisia scoparia
Stable carbon isotope
Ecological adaptation
Soil water
Biomass allocation
