Effects of Plant Diversity on Soil Organic Carbon in Alpine Meadow in Northeastern Qinghai-Xizang Plateau
Plant diversity significantly affects the structure and function of ecosystems and plays a crucial role in soil organic carbon sequestration.In the past,the effects of plant diversity on soil organic carbon were mostly carried out under artificial plant diversity control,indicating that high plant diversity significantly promoted soil organic carbon accumulation.However,in natural grassland ecosystem,the research on the effect of plant diver-sity on soil organic carbon is relatively weak.In this study,15 typical alpine meadows in the northeastern part of the Qinghai-Xizang Plateau were selected as sample sites.By measuring plant above-ground and subsurface bio-mass,soil pH value,soil microbial biomass carbon and nitrogen,soil organic carbon,granular organic carbon,mineral-bound organic carbon,total nitrogen and total phosphorus,etc.,the effects of plant diversity on soil or-ganic carbon sequestration under natural conditions were explored.It provides theoretical basis for the change of soil carbon storage and scientific management of grassland.The results showed that plant diversity significantly increased plant coverage and aboveground biomass(P＜0.01),but had no significant effect on underground bio-mass in different soil layers(0～20 cm and 20～40 cm).In 0～20 cm and 20～40 cm soil layers,the increase of plant diversity significantly increased soil microbial biomass carbon and organic carbon contents(P＜0.05),but had no effect on microbial biomass nitrogen in different soil layers.According to the classification of soil organic carbon,there was a significant positive correlation between plant diversity and soil mineral bound organic carbon content(P＜0.01),but no correlation with soil particulate organic carbon content.In conclusion,in the alpine meadow of the Qinghai-Xizang Plateau,higher plant diversity under natural conditions has a significant promot-ing effect on soil organic carbon content,which is mainly reflected in the increase of mineral binding organic car-bon content.This study provides new insights and theoretical basis for the relationship between plant diversity and soil carbon pool in grassland ecosystem.
万方数据
维普
