干旱区研究2025，Vol.42Issue(12)：2207-2219,13.DOI:10.13866/j.azr.2025.12.05
光伏电站牧草混播模式对土壤活性有机碳组分的影响
Effects of forage mixed-sowing patterns on labile organic carbon fractions in soils under photovoltaic power stations
摘要
Abstract
This study was conducted at Ningdong photovoltaic station in Ningxia,China,to investigate the ef-fects of different patterns of sowing mixtures of forage species on soil organic carbon(SOC)and its active frac-tions.Through natural restoration and mechanical no-tillage mixed sowing techniques,five mixed sowing config-urations were established to examine the distribution characteristics and factors influencing SOC and its labile fractions—including easily oxidizable organic carbon(EOC),dissolved organic carbon(DOC),and microbial biomass carbon(MBC)—in both inter-panel and under-panel habitats.The results showed that sowing a mixture of gramineous and leguminous species significantly increased SOC and its active carbon components.Specifical-ly,"a mixture of Astragalus laxmannii+Lespedeza davurica+Astragalus laxmannii+Lespedeza davurica"exhibit-ed the highest SOC,EOC,and MBC contents in the 0-20 cm soil layer between photovoltaic panels,reaching 3.91 g·kg-1,2.34 mg·kg-1,and 151.30 mg·kg-1,respectively—representing increases of 26.13%,141.24%,and 167.92%compared with the control(CK)."A mixture of Astragalus laxmannii+Lespedeza davurica+Astragalus laxmannii+Lespedeza davurica+Medicago sativa"performed best beneath the solar panels,with SOC reaching 3.95 g·kg-1 in the 0-20 cm soil layer—63.90%higher than CK—while EOC and MBC reached 1.61 mg·kg-1 and 127.69 mg·kg-1,respectively,significantly surpassing CK and most other patterns.In contrast,the sowing of a single gramineous species exhibited the lowest SOC content in the 0-20 cm soil layer between panels,at only 2.71 g·kg-1 14.39%lower than for CK.It also showed a weaker capacity to accumulate EOC and MBC,although SOC accumulation improved in the soil layer of 20-40 cm in depth.Overall,SOC levels were generally higher between photovoltaic panels than beneath them,while the DOC/SOC ratio was higher beneath the panels,indicat-ing a short-term advantage in carbon supply in these areas.Redundancy and variance partitioning analyses re-vealed that SOC and its active components were significantly regulated by soil physicochemical properties,in-cluding total nitrogen,total phosphorus,available nitrogen,and electrical conductivity,with chemical factors ex-erting a greater influence than physical ones.In conclusion,the mode of sowing a mixture of Astragalus laxman-nii,Lespedeza davurica,Astragalus laxmannii,and Lespedeza davurica demonstrated the best effectiveness in en-hancing soil carbon sequestration and carbon pool activity,making it the most suitable option for deployment be-tween photovoltaic panels,whereas sowing a mixture of Astragalus laxmannii,Lespedeza davurica,Astragalus laxmannii,Lespedeza davurica,and Medicago sativa performed optimally beneath the panels.The sowing of a single gramineous species showed relatively weak overall performance,with only some advantages in terms of carbon accumulation in deep soil.关键词
光伏电站/混播模式/土壤有机碳/活性碳组分/生态修复Key words
photovoltaic power station/mixed sowing mode/soil organic carbon/active carbon components/ecological restoration引用本文复制引用
WANG Siyao,JI Bo,BAO Pingan,WANG Zhanjun,JIANG Qi,WU Xudong,TIAN Ying,HE Jianlong..光伏电站牧草混播模式对土壤活性有机碳组分的影响[J].干旱区研究,2025,42(12):2207-2219,13.基金项目
宁夏回族自治区重点研发计划项目(2023BCF01019,2022BEG02002) （2023BCF01019,2022BEG02002）
2022年自治区青年拔尖人才培养项目 （）
中央财政林业科技推广示范项目(2024ZY06) （2024ZY06）
宁夏林草光伏生态协调发展研究项目(HLBY-2025-JF026)资助 （HLBY-2025-JF026）
