Managed sheep grazing can improve soil quality and carbon sequestration at solar photovoltaic sites
Managed sheep grazing can improve soil quality and carbon sequestration at solar photovoltaic sites
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管理羊群放牧可以改善太阳能光伏发电站的土壤质量和碳封存
DOI：
10.1002/essoar.10510141.1
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Elizabeth Towner, Tom Karas
中科院分区：
文献类型：
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作者：
Elizabeth Towner, Tom Karas
太阳能开发是土地密集型项目，最近的研究表明大规模太阳能部署对植被和土壤产生负面影响。在公用事业规模的太阳能光伏发电站上将植被与有管理的放牧放在一起可以提供可持续的解决方案，以满足不断增长的粮食和能源需求，同时提供多种协同效益。然而，引入放牧对植被太阳能光伏发电站土壤性质的影响尚不清楚。为了解决这一知识差距，我们研究了间歇性放牧羊对六个商业太阳能光伏站点（美国明尼苏达州）土壤特性（微观和宏观养分、碳储存、土壤粒度分布）的影响，并将其与未受干扰的对照站点进行了比较。结果表明，实施有管理的羊放牧显着增加了总碳储量（10-80％）和可用养分，并且变化幅度与研究地点的放牧频率（1-5年）相关。此外，研究发现，经历连续年度放牧的地点比间歇性放牧的地点受益更多。这些发现将有助于设计资源节约型综合太阳能和食品/饲料系统，同时提高土壤质量和碳固存。
Solar energy development is land intensive and recent studies have demonstrated the negative impacts of large-scale solar deployment on vegetation and soil. Co-locating vegetation with managed grazing on utility scale solar PV sites could provide a sustainable solution to meeting the growing food and energy demands, along with providing several co-benefits. However, the impacts of introducing grazing on soil properties at vegetated solar PV sites are not well understood. To address this knowledge gap, we investigated the impacts of episodic sheep grazing on soil properties (micro and macro nutrients, carbon storage, soil grain size distribution) at six commercial solar PV sites (MN, USA) and compared that to undisturbed control sites. Results indicate that implementing managed sheep grazing significantly increased total carbon storage (10-80%) and available nutrients, and the magnitude of change correlated with the grazing frequency (1-5 years) at the study sites. Furthermore, it was found that sites that experienced consecutive annual grazing treatments benefitted more than intermittently grazed sites. The findings will help in designing resource conserving integrated solar energy and food/fodder systems, along with increasing soil quality and carbon sequestration.