中国植物群落生产力由东向西分布格局及其驱动因素  

Distribution pattern and driving factors of plant community productivity from east to west in China

作　　者：王晓濛 侯继华[1,2] 何念鹏[3,4] WANG Xiaomeng;HOU Jihua;HE Nianpeng(School of Ecology and Nature Conservation,Beijing Forestry University,Beijing 100083,China;Beijing Key Laboratory of Forest Resources and Ecosystem Process,Beijing Forestry University,Beijing 100083,China;Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]北京林业大学生态与自然保护学院,北京100083 [2]北京林业大学森林资源生态系统过程北京市重点实验室,北京100083 [3]中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室,北京100101 [4]中国科学院大学资源与环境学院,北京100049

出　　处：《生态学报》2023年第6期2488-2500,共13页Acta Ecologica Sinica

基　　金：国家自然基金面上项目(31872683,32171544,32001186)。

摘　　要：植物群落生产力是表征植物群落光合生产能力的重要参数,是维护生态系统稳定性与可持续发展的基础。研究沿中国东西样带(WETC)的水热梯度对植物群落展开野外调查,并基于调查数据计算植物群落地上生物量(AGB)及地上净初级生产力(ANPP),结合环境因子对我国植物群落生产力的东西分布格局及其驱动因素进行了探讨。中国东西样带(WETC)沿30°N设置,水热梯度明显,具有良好的植被、气候等环境因素的过渡特征。在该样带上,ANPP和AGB均具有明显的经度地带性和垂直地带性分布特征,并且其空间分布特征能够较好地被环境因子所解释;具体关系为:ANPP、AGB和年降水(MAP)、生长季温度(T_(gs))、CO_(2)分压(Pco_(2))呈显著正相关关系,与太阳辐射(SRAD)、风速(WS)、pH为显著负相关关系。由于青藏高原特殊环境的影响,在该样带上除了MAP和T_(gs)外,Pco_(2)也成为影响ANPP和AGB空间分布格局的重要因子,该结论为未来研究高海拔地区群落生产力的响应机制提供了新的启示。综上所述,中国东西样带(WETC)具有良好的样带潜质,未来可能与中国东北样带(NECT)、中国东部南北样带(NSTEC)共同构成我国新的样带调查体系,为全球陆地生态系统与全球变化关系的研究提供一个更加完善的野外平台。Plant community productivity is an important parameter that reflects the production capacity of plant communities under the natural conditions.Exploring the spatial distribution pattern and driving factors of plant community productivity is not only conducive to further understanding plant community productivity and its response to climate change,but also is of great significance for maintaining the stability and sustainable development of terrestrial ecosystems.This study carried out a field survey of plant communities along the hydrothermal gradient of the West-East Transect of China(WETC).We used survey data to calculate the plant community aboveground biomass(AGB)and aboveground net primary productivity(ANPP).Combined with environmental factors such as mean annual precipitation(MAP),mean temperature of the growing season(T_(gs)),CO_(2)partial pressure(Pco 2),and the distribution pattern,as well as the driving factors of plant community productivity are discussed.The west-east 4000 km transect of China was set along the latitude 30°N,with a span of approximately 5°and a wide geographical distribution range.The WETC had an apparent precipitation gradient and a large temperature span.It also had good transition characteristics of vegetation,climate,and other environmental factors.At the same time,owing to the influence of the Qinghai-Tibet Plateau,the WETC formed a significant CO_(2)partial pressure gradient.In summary,the unique environmental advantages and hydrothermal gradient of WETC provide a new platform for studying plant community productivity.AGB and ANPP of plant communities had evident longitudinal and vertical zonal distribution characteristics in WETC,that is,with an increase in longitude,the ANPP and AGB of the plant community showed a logistic growth trend,while ANPP and AGB showed a linear decreasing trend with increasing altitude.The environmental factors could well explain their spatial distribution.Firstly,ANPP,AGB,MAP,T_(gs),and Pco_(2)were significantly positively correlated with WETC;that

关 键 词：中国东西样带 植物群落 生产力 生物量 二氧化碳分压 

分 类 号：Q948[生物学—植物学]