Physicochemical Properties and Stoichiometric Characterisation of Soils in Heterogeneous Environment in Photovoltaic Area
To investigate the effects of the heterogeneous environment within photovoltaic(PV)area on physi-cochemical characteristics of desert grassland soils in the Ili Kazakh Autonomous Prefecture,Xinjiang,sam-pling sites were divided into five treatments based on the spatial arrangement of PV panels:between PV panels,in front of PV panels,under PV panels,behind PV panels,and outside of PV panels(control group).The physicochemical characteristics of soil across different soil horizons(0-10 cm,10-20 cm,and 20-30 cm)and soil stoichiometric characteristics were analyzed.The results indicated that soil water content significantly increased in the PV panel treatment area,with an average increase of 62.35% in the 10-30 cm soil layer.Over-all,there were no significant differences in soil pH,electrical conductivity,and total nitrogen content among treatments.Soil pH value in the 0-30 cm layer under the PV panels ranged from 8.51 to 8.75,electrical con-ductivity ranged from 364.40 to 538.07 μS·cm-1,and total nitrogen content ranged from 1.58 to 2.03 g·kg-1.No significant differences were observed in the ratios of C∶N,C∶P,and N:P across soil layers,except that of in the 20-30 cm layer where the N∶P ratio under the PV panels was significantly lower than that of the control.Soil stoichiometric characteristics at some sampling points in the PV panel treatment area were superior to those of the control group.Correlation analysis revealed there were highly significant positive correlations between C∶N and SOC,C∶P and SOC,C∶P and C∶N,N:P and TN,and N∶P and C∶P(P<0.01).In conclusion,the heterogeneous environment of the PV area can enhance the physicochemical characteristics of desert grassland soils,providing a favorable reference base for the restoration of grassland vegetation and the subsequent replant-ing of grass species in the future.
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