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首页> 外文期刊>Trends in Ecology & Evolution >Spatiotemporal variations of albedo in managed agricultural landscapes: inferences to global warming impacts (GWI)
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Spatiotemporal variations of albedo in managed agricultural landscapes: inferences to global warming impacts (GWI)

机译：托管农业景观中的Albedo的时空变化：全球变暖影响的推论（GWI）

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Context Albedo can be used to quantify ecosystem and landscape contributions to local and global climate. Such contributions are conventionally expressed as radiative forcing (RF) and global warming impact (GWI). We contextualize our results within landscape carbon production and storage to highlight the importance of changes in albedo for landscape GWI from multiple causes, including net ecosystem production (NEP) and greenhouse gas (GHG) emissions. Objective To examine the spatiotemporal changes in albedo (Delta alpha) in contrasting managed landscapes through calculations of albedo-induced RF (RF Delta alpha) and GWI (GWI(Delta alpha)) under different climatic conditions. Methods We selected five contrasting landscapes within the Kalamazoo River watershed in southern Michigan USA as proof of concept. The daily MCD43A3 MODIS (V006) product was used to analyze the inter- and intra-annual variations of growing season albedo. In addition, the variations of RF Delta alpha and GWI(Delta alpha) were computed based on landscape composition and climate. Results The RF Delta alpha (- 5.6 W m(-2)) and GWI(Delta alpha) (- 1.3 CO2eq ha(-1) year(-1)) were high in forest-dominated landscapes, indicating cooling effects and CO2eq mitigation impacts similar to crops. The CO2eq mitigation of cropland-dominated landscapes was on average 52% stronger than forest-dominated landscapes. In the landscape with the highest proportion of forest, under dry and wet conditions CO2eq mitigation was reduced by up to 24% and similar to 30%, respectively; in one cropland-dominated landscape wet conditions reduced CO2eq mitigation by 23%. Conclusions Findings demonstrate that quantifying spatiotemporal changes in albedo in managed landscapes and under different climatic conditions is essential to understand how landscape modification affects RF Delta alpha and GWI(Delta alpha) and thereby contributes to ecosystem-level GWI.
机译：上下文Albedo可用于量化生态系统和景观贡献，对当地和全球气候。这些贡献通常表示为辐射强制（RF）和全球变暖影响（GWI）。我们在景观碳生产和储存中阐明了我们的结果，以突出来自多个原因的景观GWI的Albedo的变化的重要性，包括净生态系统生产（NEP）和温室气体（GHG）排放。目的通过在不同气候条件下通过计算反应性RF（RF DELTAα）和GWI（GWI（DELTA ALPHA）计算对比综合体景观的Albedo（DELTA ALPHA）的时空变化。方法我们选择了五大南部密歇根州美国南部的卡拉马祖河流域阵地造影景观作为概念证明。每日MCD43A3 MODIS（V006）产品用于分析生长季节Albedo的间歇和年内变化。此外，基于景观组合和气候计算RF Deltaα和GWI（Delta alpha）的变化。结果RF Deltaα（ - 5.6WM（-2））和GWI（Delta alpha）（ - 1.3 CO2EQ HA（-1）年（-1））在森林主导的景观中高，表明冷却效果和CO2EQ缓解类似于作物的影响。农田统治景观的CO2EQ缓解平均比森林主导的景观更强52％。在具有最高比例森林的景观中，在干燥和湿润的条件下，CO 2℃减轻率降低至24％，同比分别为30％;在一个耕地占地景观潮流条件下，减少了23％的CO2EQ缓解。结论发现表明，在不同气候条件下量化Albedo的时空变化是了解景观修改如何影响RF Delta alpha和GWI（Delta Alpha），从而有助于生态系统级GWI是必不可少的。

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