秦岭典型群落木本植物生物量影响因素研究OA北大核心CSTPCD

In order to clarify the factors influencing the woody plant biomass of typical communities occur-ring in the Qinling Mountains and driving mechanism to provide theoretical basis for reasonably improving the community biomass,and accurately evaluating the functions of the forest ecosystem,as well as sustain-able forest management in the mountains,this study took different types of forest communities in the mountains as the research objects.Based on the data of 26 560 living trees in 501 sample plots of 97 typical community types,by using variance component analysis and multiple linear regression model,the effects of species diversity and structural diversity on the biomass were explored.The relationships between precipi-tation,temperature,soil and other environmental factors and biomass were analyzed.The conclusions are as follows.1)Species diversity,structural diversity and environmental factors all affect the aboveground,un-derground and total biomass of the community,among which the biomass is significantly and negatively correlated with species diversity,and significantly and positively correlated with structural diversity.2)Compared with species diversity and environmental factors,structural diversity has the greatest effect on the aboveground,underground and total biomass of the community,while environmental factors have the smallest effect.3)Different environmental factors have different effects on biomass.The relationship be-tween precipitation and biomass is not significant,while soil and temperature have significant relationships with biomass.In addition,electrical conductivity and carbon nitrogen ratio can promote the accumulation of biomass,while temperature seasonality and isotherm can inhibit the accumulation of biomass.