摘要
旱区植物多样性、生产力与环境因子的关系是旱区生态学研究的重要课题,对于揭示该地区植被的环境适应机制有重要的参考价值。基于中国旱区东西样带的系统采样和原位调查,定量分析了各影响因素对旱区植物多样性和生产力变化的解释作用,阐明了旱区群落生产力的调控机制。结果表明:(1)旱区群落性状加权值与地上生物量间的关系(R^(2)=0.46)相较于Shannon-Wiener指数与地上生物量的关系(R^(2)=0.21)更为紧密。(2)旱区群落Shannon-Wiener指数、群落性状加权值、地上生物量与年均降水量、土壤有机碳含量、土壤总氮含量线性正相关,与土壤总磷含量无显著相关性;Shannon-Wiener指数、群落性状加权值与年均气温线性负相关,地上生物量与年均气温无显著相关性。(3)年均降水量对旱区群落性状加权值的解释率为40.9%,两者为正相关关系;年均气温对Shannon-Wiener指数的解释率为28.3%,两者为负相关关系。(4)群落性状加权值对地上生物量的直接路径显著,年均降雨量、年均气温和土壤有机碳通过群落性状加权值间接影响地上生物量。
The relationship between plant diversity, productivity and environmental factors in the dryland is an important subject of ecological research, which will provide scientific guidance for revealing the environmental adaptation mechanism of vegetation in this area. Based on systematic sampling and in-situ investigation along the east-west transect in the dryland of northern China, the effects of various factors on diversity and productivity, and the regulation mechanism of productivity were quantified. The results showed that:(1) the relationship between community weighted mean trait values and aboveground biomass in the dryland(R^(2)=0.46) was stronger than that between Shannon-Wiener index and aboveground biomass(R^(2)=0.21).(2) The Shannon-Wiener index, community weighted mean trait values, and aboveground biomass in the dryland were positively and linearly correlated with mean annual precipitation, soil organic carbon content and total soil nitrogen content, while were not significantly correlated with total soil phosphorus. The Shannon-Wiener index and community weighted mean trait values were negatively and linearly correlated with mean annual temperature, while the aboveground biomass was not significantly correlated with mean annual temperature.(3) The mean annual precipitation explained 40.9% of the change of community weighted mean trait values in the dryland, and the two were positively correlated. The mean annual temperature explained 28.3% of the change of Shannon-Wiener index in the dryland, and the two were negatively correlated.(4) The direct path of community weighted mean trait values to the aboveground biomass was significant. The mean annual precipitation, mean annual temperature and soil organic carbon indirectly affected aboveground biomass through the community weighted mean trait values.
作者
杨永
卫伟
王琳
刘泽漫
YANG Yong;WEI Wei;WANG Lin;LIU Zeman(State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;University of Chinese Academy of Sciences,Beijing 100049,China;National Observation and Research Station of Earth Critical Zone on the Loess Plateau in Shaanxi,Xi'an 710061,China)
出处
《生态学报》
CAS
CSCD
北大核心
2023年第4期1563-1571,共9页
Acta Ecologica Sinica
基金
国家自然科学基金项目(41991233,U21A2011,41971129)
中科院青促会优秀会员项目。
关键词
旱区
植物多样性
地上生物量
气候因子
土壤养分
dryland
plant diversity
aboveground biomass
climatic factors
soil nutrient
