光伏阵列对不同区域生态系统土壤与植被的异质性影响分析OA

Large-scale deployment of photovoltaic(PV)power stations alters surface microhabitats,but its effects on soil quality and vegetation characteristics across different ecosystems remain unclear.This study examined PV sites in grassland,Gobi desert,and coal-mining subsidence areas.Seventeen indica-tors of vegetation characteristics,soil physicochemical properties,and microbial biomass were compared between areas beneath and between PV panels.A general indicator of soil quality(GISQ)was then calcu-lated to quantify the contribution of each indicator and its relationship with vegetation responses.PV arrays significantly increased the GISQ in the Gobi desert and coal-mining subsidence areas.The soil physical sub-index increased significantly in all three ecosystems,mainly because of lower soil temperature,while increased soil moisture also contributed in the coal-mining subsidence area.PV arrays had no significant effect on the soil chemical sub-index in any ecosystem.However,beneath panels in the Gobi desert,soil organic carbon and total nitrogen increased,whereas available NH4+-N,Na+,and Ca2+decreased.Effects on the soil microbial sub-index differed among ecosystems,increasing beneath panels in the Gobi desert but decreasing in the grassland.Plant biomass and species richness increased beneath panels in the Gobi des-ert.In the grassland,only species richness increased,while biomass did not change significantly.Neither plant biomass nor species richness changed significantly in the coal-mining subsidence area.PV-induced changes in plant biomass were positively correlated with the GISQ and microbial activity in the coal-mining subsidence area,negatively correlated with changes in soil temperature in the grassland,and positively cor-related with soil oxidase activity in the Gobi desert.These results indicate that the ecological effects of PV arrays depend strongly on baseline habitat conditions.