نتایج جستجو برای: drought magnitude

تعداد نتایج: 170566  

2016
Muna Maryam Azmy Mazlan Hashim Shinya Numata Tetsuro Hosaka Nur Supardi Md. Noor Christine Fletcher

General flowering (GF) is a unique phenomenon wherein, at irregular intervals, taxonomically diverse trees in Southeast Asian dipterocarp forests synchronize their reproduction at the community level. Triggers of GF, including drought and low minimum temperatures a few months previously has been limitedly observed across large regional scales due to lack of meteorological stations. Here, we aim...

2009
Jingfeng Xiao Qianlai Zhuang Eryuan Liang A. David McGuire Aaron Moody David W. Kicklighter Xuemei Shao Jerry M. Melillo

Midlatitude regions experienced frequent droughts during the twentieth century, but their impacts on terrestrial carbon balance are unclear. This paper presents a century-scale study of drought effects on the carbon balance of terrestrial ecosystems in China. The authors first characterized the severe extended droughts over the period 1901–2002 using the Palmer drought severity index and then e...

2005
Robert K. Booth Stephen T. Jackson Steven L. Forman John E. Kutzbach E. A. Bettis Joseph Kreig David K. Wright

We present evidence from a variety of physical and biological proxies for a severe drought that affected the mid-continent of North America between 4.1 and 4.3 ka. Rapid climate changes associated with the event had large and widespread ecological effects, including dune reactivation, forest fires and long-term changes in forest composition, highlighting a clear ecological vulnerability to simi...

Journal: :Remote Sensing 2016
Zhenyuan Xi Dengsheng Lu Lijuan Liu Hongli Ge

Hickory plantations play an important role in improving local farmers’ economic conditions, but extreme drought in July–August 2013 seriously influenced hickory nut production. It is necessary to understand the extent and magnitude of this drought-induced hickory disturbance through mapping its spatial distribution using remote sensing data. This paper proposes a new approach to examine hickory...

2004
M. Shane Heschel Sonia E. Sultan Susan Glover Dan Sloan

We tested the generalist annual plant Polygonum persicaria (Polygonaceae) for adaptive differentiation in drought responses. Populations from one consistently moist and two variably dry sites were grown in moist and drought conditions in a greenhouse. Physiological, morphological, and reproductive data were collected. All three populations maintained similar levels of fitness in both drought an...

2005
S. M. Vicente-Serrano J. I. López-Moreno

At present, the Standardized Precipitation Index (SPI) is the most widely used drought index to provide good estimations about the intensity, magnitude and spatial extent of droughts. The main advantage of the SPI in comparison with other indices is the fact that the SPI enables both determination of drought conditions at different time scales and monitoring of different drought types. It is wi...

2017
Asrat Asfaw Daniel Ambachew Trushar Shah Matthew W. Blair

Common beans are a warm-season, food legume cultivated in areas prone to water limitation throughout their growing season. This study assessed the magnitude and pattern of trait associations for a total of 202 common bean genotypes divided into panels of 81 Andean and 121 Mesoamerican gene pool accessions grown under contrasting treatments of well-watered, non-stress, and water-limited, termina...

1998
Connie A. Woodhouse Jonathan T. Overpeck

Drought is one of the most damaging climaterelated hazards to impact societies. Although drought is a naturally occurring phenomenon throughout most parts of the world, its effects have tremendous consequences for the physical, economic, social, and political elements of our environment. Droughts impact both surface and groundwater resources and can lead to reductions in water supply, diminishe...

2012
J.-P. Vidal E. Martin

Drought events develop in both space and time and they are therefore best described through summary joint spatio-temporal characteristics, such as mean duration, mean affected area and total magnitude. This paper addresses the issue of future projections of such characteristics of drought events over France through three main research questions: (1) Are downscaled climate projections able to si...

2012
Christopher R. Schwalm Christopher A. Williams Kevin Schaefer Dennis Baldocchi T. Andrew Black Allen H. Goldstein Beverly E. Law Walter C. Oechel Kyaw Tha Paw Russel L. Scott

Fossil fuel emissions aside, temperate North America is a net sink of carbon dioxide at present1–3. Year-to-year variations in this carbon sink are linked to variations in hydroclimate that affect net ecosystem productivity3,4. The severity and incidence of climatic extremes, including drought, have increased as a result of climate warming5–8. Here, we examine the effect of the turn of the cent...

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