放牧对土壤侵蚀敏感性时空影响的地理空间模拟方法

IF 2.9 Q2 SOIL SCIENCE Soil Systems Pub Date : 2023-03-30 DOI:10.3390/soilsystems7020030
F. C. Pereira, Mitchell Donovan, Carol M. S. Smith, S. Charters, T. Maxwell, P. Gregorini
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引用次数: 2

摘要

减少土壤侵蚀的放牧管理对于在畜牧生产系统下保护和增强草原健康至关重要。然而,由于这些生产系统的重点是提高生产力,因此将土壤及其复杂性纳入放牧管理通常被忽视。详细考虑土壤对侵蚀的时空敏感性可能最好通过模拟建模来实现。为了了解和探索放牧策略对土壤表面侵蚀的时空影响,本工作在新西兰的一个高地畜牧业生产系统中使用了地理空间模型方法作为案例研究。我们对一年中每个季节和不同牲畜类型(绵羊、牛肉和鹿)的45个场景进行了建模,这些场景以不同的种群密度和占用期为特征,共产生540个场景。此外,我们还纳入了代表每个季节未分级牧场的情景,并将案例研究站的当前放牧管理作为比较的基线(共产生545个情景)。未分级牧场自然土壤表层侵蚀的时空变化似乎比控制放牧强度的影响更为相关,这表明我们研究区域的围场具有不同的支持放牧的能力,这种能力也会随着季节的变化而变化。与牲畜密度的增加相比,占用期的增加似乎更不利于土壤侵蚀,与绵羊和鹿相比,牛是最有害的牲畜类型。我们的研究结果表明,根据站点的时空异质性和侵蚀易感性,通过应用上下文调整的放牧管理策略,可以增强LUMGS的草原健康。
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A Geospatial Modelling Approach to Understand the Spatio-Temporal Impacts of Grazing on Soil Susceptibility to Erosion
Grazing management to reduce soil erosion is paramount for preserving and enhancing grassland health under pastoral livestock production systems. However, as the focus of these production systems is to increase productivity, the inclusion of the soil and its complexity in grazing management has been usually neglected. Detailed consideration of the soil spatio-temporal susceptibility to erosion may be best approached with simulation modelling. To understand and explore the spatio-temporal impact of grazing strategies on soil surface erosion, this work used a geospatial model approach in a high-country pastoral livestock production system in New Zealand as a case study. We modelled 45 scenarios characterized by different stock densities and occupation periods applied for each season of the year and for different livestock types: sheep, beef, and deer, producing a total of 540 scenarios. In addition, we included scenarios to represent ungrazed pastures for each season and the current grazing management of the case study station as the baseline for comparisons (resulting in a total of 545 scenarios). Spatio-temporal variation of natural soil superficial erosion from ungrazed pastures appears to be more relevant than the impact of manipulating grazing intensity and indicates that paddocks in our study area have different capacities to support grazing which also changes during seasons. Increases in occupation period seem more detrimental to soil erosion compared to increases in stock density, and cattle are the most detrimental stock type compared to sheep and deer. Our results suggest that grassland health can be enhanced in LUMGS by applying context-adjusted grazing management strategies according to the station spatio-temporal heterogeneity and susceptibility to erosion.
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来源期刊
Soil Systems
Soil Systems Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
5.30
自引率
5.70%
发文量
80
审稿时长
11 weeks
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