Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.16081 |
Compound hydroclimatic extremes in a semi-arid grassland: Drought, deluge, and the carbon cycle | |
David L. Hoover; Olivia L. Hajek; Melinda D. Smith; Kate Wilkins; Ingrid J. Slette; Alan K. Knapp | |
2022-01-25 | |
发表期刊 | Global Change Biology |
出版年 | 2022 |
英文摘要 | Climate change is predicted to increase the frequency and intensity of extreme events including droughts and large precipitation events or “deluges.” While many studies have focused on the ecological impacts of individual events (e.g., a heat wave), there is growing recognition that when extreme events co-occur as compound extremes, (e.g., a heatwave during a drought), the additive effects on ecosystems are often greater than either extreme alone. In this study, we assessed a unique type of extreme—a contrasting compound extreme—where the extremes may have offsetting, rather than additive ecological effects, by examining how a deluge during a drought impacts productivity and carbon cycling in a semi-arid grassland. The experiment consisted of four treatments: a control (average precipitation), an extreme drought (<5th percentile), an extreme drought interrupted by a single deluge (>95th percentile), or an extreme drought interrupted by the equivalent amount of precipitation added in several smaller events. We highlight three key results. First, extreme drought resulted in early senescence, reduced carbon uptake, and a decline in net primary productivity relative to the control treatment. Second, the deluge imposed during extreme drought stimulated carbon fluxes and plant growth well above the levels of both the control and the drought treatment with several additional smaller rainfall events, emphasizing the importance of precipitation amount, event size, and timing. Third, while the deluge's positive effects on carbon fluxes and plant growth persisted for 1 month, the deluge did not completely offset the negative effects of extreme drought on end-of-season productivity. Thus, in the case of these contrasting hydroclimatic extremes, a deluge during a drought can stimulate temporally dynamic ecosystem processes (e.g., net ecosystem exchange) while only partially compensating for reductions in ecosystem functions over longer time scales (e.g., aboveground net primary productivity). |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/346007 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | David L. Hoover,Olivia L. Hajek,Melinda D. Smith,et al. Compound hydroclimatic extremes in a semi-arid grassland: Drought, deluge, and the carbon cycle[J]. Global Change Biology,2022. |
APA | David L. Hoover.,Olivia L. Hajek.,Melinda D. Smith.,Kate Wilkins.,Ingrid .,...&Alan K. Knapp.(2022).Compound hydroclimatic extremes in a semi-arid grassland: Drought, deluge, and the carbon cycle.Global Change Biology. |
MLA | David L. Hoover,et al."Compound hydroclimatic extremes in a semi-arid grassland: Drought, deluge, and the carbon cycle".Global Change Biology (2022). |
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