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Land-use conversions from managed grasslands to croplands in Uruguay increase medium-term net carbon emissions to the atmosphere
Journal of Land Use Science ( IF 2.7 ) Pub Date : 2021-06-16 , DOI: 10.1080/1747423x.2021.1933227
José P. Castaño-Sánchez 1, 2 , R. César Izaurralde 1 , Stephen D. Prince 1
Affiliation  

ABSTRACT

Globally, significant land conversions of traditionally managed temperate grasslands to croplands were taking place. Among these is South-Central Uruguay where changes in recent decades have highly likely impacted plant productivity, soil quality, and carbon fluxes at a regional scale. A geospatial version of the biophysical model EPIC was developed and validated (Geospatial-EPIC-UY). An analysis of the potential impact of the land use change on the carbon fluxes was performed, considering the conversion of all the suitable cropping areas over a 15-year period. Modeled net ecosystem exchange (NEE) showed that, on average, grasslands C emissions were close to neutral (0.1 Mg CO2 ha−1 year−1), while croplands contributed almost 7 times this value. Also, the inter-annual variation of grassland NEE was significantly less than that of the cropland. These results highlight the potential C losses under extended land conversions, which could be attenuated or even reverted if best management practices were implemented.



中文翻译:

乌拉圭从管理草地到农田的土地利用转换增加了向大气中的中期净碳排放量

摘要

在全球范围内,传统管理的温带草原正在发生大量土地转变为农田。其中包括乌拉圭中南部地区,那里近几十年来的变化很可能在区域范围内影响了植物生产力、土壤质量和碳通量。开发并验证了生物物理模型 EPIC 的地理空间版本 (Geospatial-EPIC-UY)。考虑到所有适宜种植区在 15 年期间的转换,对土地利用变化对碳通量的潜在影响进行了分析。模拟的净生态系统交换 (NEE) 显示,平均而言,草原碳排放接近中性(0.1 Mg CO 2 ha -1-1),而农田贡献了该值的近 7 倍。此外,草地NEE的年际变化显着小于农田。这些结果突出了延长土地转换的潜在碳损失,如果实施最佳管理实践,这种损失可能会减弱甚至恢复。

更新日期:2021-06-21
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