摘要
在全球气候变化背景下,降水变化和氮添加草地物种多样性和生产力,但高寒草原研究较少,尤其是长期水氮控制试验。为此,本试验于青海省三角城种羊场紫花针茅高寒草原开展降水变化和氮(N)添加野外控制试验,从植被盖度、物种多样性指数及地上生物量进行测定,研究高寒草原长期降水变化和N添加对其物种多样性及生产力的影响。降水增加处理使群落盖度显著增加,而降水减少使群落盖度显著降低;N添加使高寒草原物种多样性指数均显著降低;N添加与降水增加处理对地上生物量有显著的促进作用,但降水减少对地上生物量的影响则相反;地上生物量与物种多样性指数呈极显著的负相关关系(P<0.01)。本研究将为我国草原生态系统的保护及草原管理提供科学依据,同时也为后续的生态模型的建立和科学的预测提供理论依据。
In the context of global climate change,precipitation change and nitrogen addition have significant effects on grassland species diversity and productivity,but alpine grassland is less studied,especially in long-term water and nitrogen control trials.For this reason,this experiment was carried out in the alpine grassland of purple-flowered needlegrass in the Triangle City Sheep Farm,Qinghai Province,to study the effects of long-term precipitation change and N addition on species diversity and productivity of alpine grassland according to vegetation cover,species diversity index,and aboveground biomass.The results showed that precipitation increase significantly increased community cover,while the decreased precipitation significantly decreased community cover;N addition significantly decreased the species diversity index of alpine grassland;N addition and the increased precipitation significantly increased aboveground biomass,while the decreased precipitation had the opposite effect on aboveground biomass;aboveground biomass showed a highly significant negative correlation with the species diversity index(P<0.01).The results of this experiment will provide a scientific basis for the protection of grassland ecosystems and grassland management in China,as well as a theoretical basis for the establishment of subsequent ecological models and scientific predictions.
作者
邓彤彤
周国英
肖元明
靳玉婷
李长斌
DENG Tong-tong;ZHOU Guo-ying;XIAO Yuan-ming;JIN Yu-ting;LI Chang-bin(College of Agriculture and Animal Husbandry,Qinghai University,Xining,QingHai Province 810016,China;Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining,QingHai Province 810008,China)
出处
《草地学报》
CAS
CSCD
北大核心
2024年第5期1448-1458,共11页
Acta Agrestia Sinica
基金
青海省自然科学基金项目(2022-ZJ-957Q)
国家自然科学基金地区基金项目(32160289)
青海大学青年科研基金项目(2021-QNY-11)资助。
关键词
物种多样性
生产力
降水变化
氮添加
高寒草原
青藏高原
Species diversity
Productivity
Precipitation changes
Nitrogen addition
Alpine grasslands
Qinghai Tibet Plateau
