Summer drought influence on CO2 and water fluxes of extensively managed grassland in Germany

Hussain, Mubasher; Grünwald, Thomas; Tenhunen, John; Li, Y.L.; Mirzae, H.; Bernhofer, C.; Otieno, Dennis; Dinh, N.Q.; Schmidt, Mark; Wartinger, Margarete; Owen, Katherine E.

doi:10.1016/j.agee.2011.02.013

Cited by 64 publications

(33 citation statements)

References 49 publications

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“…8b). Our results were consistent with previous studies (Cook et al, 2004;Ciais et al, 2005;Hussain et al, 2011;Chen et al, 2013;Wagle et al, 2014;Zscheischler et al, 2014;Xiao et al, 2009Xiao et al, , 2010Xiao et al, , 2014. For example, using eddy covariance data and simulations by a carbon flux model, Ciais et al (2005) estimated a 30% reduction of GPP in the extreme drought year of 2003 when compared to 1998over Europe.…”

Section: Drought Impacts On Hydrology and Ecosystem Productivitysupporting

confidence: 94%

Drought impacts on ecosystem functions of the U.S. National Forests and Grasslands: Part II assessment results and management implications

Sun

Caldwell

et al. 2015

Forest Ecology and Management

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a b s t r a c tThe 781,000 km 2 (193 million acre) United States National Forests and Grasslands system (NF) provides important ecosystem services such as clean water supply, timber production, wildlife habitat, and recreation opportunities to the American public. Quantifying the historical impacts of climate change and drought on ecosystem functions at the national scale is essential to develop sound forest management and watershed restoration plans under a changing climate. This study applied the previously validated Water Supply and Stress Index model (WaSSI) to 170 NFs in the conterminous U.S. (CONUS) to examine how historical extreme droughts have affected forest water yield (Q) and gross primary productivity (GPP). For each NF, we focused on the five years with the lowest annual SPI3 (Standardized Precipitation Index on a 3-month time scale) during 1962-2012. The extent of extreme droughts as measured by the number of NFs and total area affected by droughts has increased during the last decade. Across all lands in CONUS, the most extreme drought during the past decade occurred in 2002, resulting in a mean reduction of Q by 32% and GPP by 20%. For the 170 individual NFs, on average, the top-five droughts represented a reduction in precipitation by 145 mm yr À1 (or 22%), causing reductions in evapotranspiration by 29 mm yr À1 (or 8%), Q by 110 mm yr À1 (or 37%) and GPP by 65 gC m À2 yr À1 (or 9%). The responses of the forest hydrology and productivity to the top-five droughts varied spatially due to different land-surface characteristics (e.g., climatology and vegetation) and drought severity at each NF. This study provides a comprehensive benchmark assessment of likely drought impacts on the hydrology and productivity in NFs using consistent methods and datasets across the conterminous U.S. The study results are useful to the forestry decision makers for developing appropriate strategies to restore and protect ecosystem services in anticipating potential future droughts and climate change.Published by Elsevier B.V.

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Section: Drought Impacts On Hydrology and Ecosystem Productivitysupporting

confidence: 94%

Drought impacts on ecosystem functions of the U.S. National Forests and Grasslands: Part II assessment results and management implications

Sun

Caldwell

et al. 2015

Forest Ecology and Management

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“…For example, RE follows the same dynamic patterns as GPP from daily to seasonal scales (Krishnan et al, 2009; et al, 2011; Thomas et al, 2009). Annually, GPP and RE are both enhanced in humid years, but repressed in dry years (Hussain et al, 2011;Rodrigues et al, 2011); especially, both of them are remarkably reduced in extreme drought years Reichstein et al, 2007a).…”

Section: Introductionmentioning

confidence: 85%

Covariation between gross primary production and ecosystem respiration across space and the underlying mechanisms: A global synthesis

Chen

Zhu

et al. 2015

Agricultural and Forest Meteorology

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a b s t r a c tGross primary production (GPP) and ecosystem respiration (RE) are two important processes in the terrestrial carbon cycle. Understanding the relationships between GPP and RE across space, as well as the underlying mechanisms, is helpful for understanding the terrestrial carbon cycle and predicting the global carbon budget. In this study, we investigated the correlation between the spatial variations in GPP and RE by compiling carbon flux data from 264 sites across the Asian, European, North American, South American, African, and Oceanian regions. The results indicated that GPP and RE covaried across space regionally and globally (P < 0.001). The spatial variations in GPP explained 66-98% of the variations in RE in the six regions (approximately explained 60-76% when considered the effects of self-correlation caused by current flux partitioning algorithm), and it explained 90% of RE variations at the global scale (about 70% when considered the effects of self-correlation). RE/GPP values were not significantly different among the six regions or between the two hemispheres. RE/GPP values consistently averaged at 0.87 ± 0.04 along the spatial variations in climate and vegetation index. This covariation between GPP and RE across space is largely attributed to the parallel responses of GPP and RE to the common climatic and vegetation factors, but the underlying mechanism lies in productivity as the primary and direct substrate supplier for respiration which fundamentally constrains RE. These results suggest that the variation in photosynthate availability is the dominant driver for respiration across space and that this process must be fully considered in the cross-site RE comparisons.

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“…Em regiões semiáridas a disponibilidade de água no solo é o fator primário no controle do fluxo de água (sobretudo da evapotranspiração), na assimilação de carbono e na respiração do ecossistema (Hussain et al, 2011). As chuvas irregulares, pouco frequentes, os períodos de estiagem, o clima e as mudanças de uso da terra, adicionam mais complexidade na hidrologia das regiões semiáridas (Montenegro & Ragab, 2012).…”

Section: Introductionunclassified

Balanço hídrico em área de pastagem no semiárido pernambucano

Souza

Antonino

Lima

2015

Rev. bras. eng. agríc. ambient.

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R E S U M OPropôs, neste trabalho, avaliar a distribuição e a interação entre os componentes do balanço hídrico em uma área de pastagem cultivada em Serra Talhada, no semiárido pernambucano. Foram realizados monitoramentos da precipitação pluvial (P), da variação no armazenamento de água (∆A) e do escoamento superficial (ES) para determinação do balanço hídrico. A evapotranspiração (ET) foi obtida a partir da covariância dos vórtices turbulentos. O fluxo total de água no solo (Q), ou seja, a drenagem (-Q) ou ascensão capilar (+Q) foi obtido a partir da equação do balanço hídrico. A taxa de ET da pastagem foi baixa; ainda assim, foi o principal componente de saída de água do sistema seguido pelo ES que, juntos, totalizaram aproximadamente 80% da precipitação pluvial. Esta pesquisa demonstrou que mesmo em anos de seca é necessário se quantificar o ES e as perdas e/ou ganhos de água no limite inferior do solo para se ter uma avaliação precisa da dinâmica da água no sistema solo-pastagem em condições de semiárido.Water balance in pasture area in semi-arid region of Pernambuco A B S T R A C TThis study aimed to evaluate the distribution and the interaction between the components of the water balance in pasture area cultivated in Serra Talhada, in the semi-arid region of Pernambuco. Precipitation (P), the variation in water storage (∆WS) and runoff (R) were monitored for determination of water balance. The evapotranspiration (ET) was obtained from the Eddy covariance method. The total flow of water in the soil (Q), i.e. the drainage (-Q) and raising damp (+Q) was obtained from the equation of water balance. The rate of evapotranspiration of pasture was low, yet this was the main system of water output component, followed by runoff, which together totaled approximately 80% of precipitation. This research demonstrated that, even in years of drought it is necessary to quantify the runoff and losses and/or water gains at lower limit of the soil to get accurate assessment of the dynamics of water in soil-pasture system in semi-arid conditions. Palavras-chave:escoamento superficial evapotranspiração drenagem armazenamento de água no solo

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Summer drought influence on CO2 and water fluxes of extensively managed grassland in Germany

Cited by 64 publications

References 49 publications

Drought impacts on ecosystem functions of the U.S. National Forests and Grasslands: Part II assessment results and management implications

Drought impacts on ecosystem functions of the U.S. National Forests and Grasslands: Part II assessment results and management implications

Covariation between gross primary production and ecosystem respiration across space and the underlying mechanisms: A global synthesis

Balanço hídrico em área de pastagem no semiárido pernambucano

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