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Modelling soil loss from surface erosion at high-resolution to better understand sources and drivers across land uses and catchments; a national-scale assessment of Aotearoa, New Zealand
Environmental Modelling & Software ( IF 4.8 ) Pub Date : 2021-10-28 , DOI: 10.1016/j.envsoft.2021.105228
Mitchell Donovan 1
Affiliation  

Soil erosion is a significant challenge for agricultural regions, with cascading impacts to waterways, land productivity, soil carbon, and ecological health. We provide the first national-scale soil erosion model that incorporates the impacts of grazing on ground cover (Cgr) and soil erodibility (Ktr) into the RUSLE framework. Surface erosion rates for winter-forage paddocks (11 t ha−1 y−1) were substantially higher than pastoral grasslands (0.83 t ha−1 y−1), woody grasslands (0.098 t ha−1 y−1), forests (0.103 t ha−1 y−1) and natural soil production rates (≤1–2 t ha−1 y−1). Validation with empirical measurements from sediment traps, sediment cores, and chemical fingerprinting demonstrated strong linear regressions (r2 = 0.86). Terrain impacted soil erosion directly through slope steepness and flow convergence and indirectly through strong orographic effects on rainfall erosivity (r2 = 0.39–0.83). Annual surface erosion across Aotearoa New Zealand could reach 16.5-29.2 Mt y−1, representing ∼$20M annually and up to 24–31% of sediment yield for two catchments.



中文翻译:

以高分辨率模拟地表侵蚀造成的土壤流失,以更好地了解土地利用和集水区的来源和驱动因素;新西兰 Aotearoa 的国家级评估

土壤侵蚀是农业地区面临的重大挑战,对水道、土地生产力、土壤碳和生态健康产生连锁影响。我们提供了第一个全国范围的土壤侵蚀模型,该模型将放牧对地被植物(C gr ) 和土壤可蚀性 (K tr ) 的影响纳入 RUSLE 框架。冬季牧草围场 (11 t ha -1 y -1 ) 的表面侵蚀率明显高于牧区草地 (0.83 t ha -1 y -1 )、木本草地 (0.098 t ha -1 y -1 )、森林 ( 0.103 t ha -1 y -1 ) 和自然土壤生产率 (≤1–2 t ha -1y -1 )。对沉积物圈闭、沉积物岩心和化学指纹的经验测量的验证证明了强线性回归 (r 2  = 0.86)。地形通过坡度陡度和水流汇聚直接影响土壤侵蚀,并通过对降雨侵蚀力的强烈地形影响间接影响土壤侵蚀(r 2  = 0.39-0.83)。新西兰 Aotearoa 的年地表侵蚀量可能达到 16.5-29.2 Mt y -1,相当于每年约 2000 万美元,两个流域的沉积物产量高达 24-31%。

更新日期:2021-11-23
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