نتایج جستجو برای: rain and drought

تعداد نتایج: 16836092  

2014
Allison H. Roy Lee K. Rhea Audrey L. Mayer William D. Shuster Jake J. Beaulieu Matthew E. Hopton Matthew A. Morrison Ann St. Amand

Decentralized stormwater management approaches (e.g., biofiltration swales, pervious pavement, green roofs, rain gardens) that capture, detain, infiltrate, and filter runoff are now commonly used to minimize the impacts of stormwater runoff from impervious surfaces on aquatic ecosystems. However, there is little research on the effectiveness of retrofit, parcel-scale stormwater management pract...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2005
Christopher W Dick S Joseph Wright

O f all ecosystems in tropical America, seasonally dry forests, patchily distributed where relatively fertile soils, annual rainfall 1,600 mm, and strong seasonal drought coincide, are perhaps the least understood and most endangered (1, 2). Mesoamerican dry forest diversity peaks in southwest Mexico, where up to 16% of tree species are local endemics (3). Judith Becerra, in this issue of PNAS ...

Drought is the main causes of significant water imbalance, increase of crop losses or limitation in water consumption, and finally large number of socioeconomic and environmental problems. Precipitation amount is the most important climatic variables that its spatiotemporal variability has a great influence on water resources availability along with the effects of climate change. The Angot inde...

Journal: :Water 2021

Satellite-based precipitation products can be a better alternative of rain gauges for hydro-meteorological studies in data-poor regions. This study aimed to evaluate how regional and seasonal drought patterns had changed the Ganga–Brahmaputra Basin between 1983 2020 with PERSIANN-CDR data. The spatial pattern winter drought, monsoon Standardized Precipitation Index (SPI) calculated different ti...

2010
Juan Carlos Melgar Jill M. Dunlop James P. Syvertsen

We determined if winter drought stress could delay flowering and fruit development of immature ‘Valencia’ sweet oranges to avoid young fruit loss during late-season mechanical harvesting. Beginning in December over three consecutive seasons (2007–2009), Tyvek water-resistive barrier material was used as a rain shield groundcover under 13to 15-year-old trees. There were three treatments: 1) drou...

Journal: :تحقیقات اقتصاد و توسعه کشاورزی ایران 0
اعظم رضایی دانشجو/دانشگاه تربیت مدرس سید ابوالقاسم مرتضوی استاد/دانشگاه تربیت مدرس غلامرضا پیکانی استاد/دانشگاه تهران

the agriculture sector is the largest water consumer in arid and semi-arid areas. so water scarcity has an important effect on this section. drought as one of the most important factors in making crisis in zayanderud river basin (zrb) has a deep effect on the agriculture sector. this study evaluates the drought effects on irrigation land and farmers profit on the east of zrb by using spi and cb...

Journal: :Ecology 2010
Cory C Cleveland William R Wieder Sasha C Reed Alan R Townsend

Climate models predict precipitation changes for much of the humid tropics, yet few studies have investigated the potential consequences of drought on soil carbon (C) cycling in this important biome. In wet tropical forests, drought could stimulate soil respiration via overall reductions in soil anoxia, but previous research suggests that litter decomposition is positively correlated with high ...

2015
Daniel Moya Francisco R. López-Serrano Pablo Ferrandis

Salvage logging is the commonest post-fire emergency action, but has unclear ecological effects. In the Mediterranean Basin, drought periods and fire regimes are changing and forest management should be adapted. In summer 2009, a mid-high severity fire burned 968 ha of Aleppo pine (Pinus halepensis Mill.) forest in southeast Spain, which was submitted to salvage logging six months later. In spr...

Journal: :Tree physiology 2013
Danielle A Way Catherine Crawley Rowan F Sage

By 2100, climate change is predicted to warm high-latitude summers by 3–8 °C (ACIA 2005, Christensen et al. 2007). High temperatures will become more common in the boreal region and, in the absence of significantly increased precipitation, drought frequency and intensity will increase. Much of the North American boreal consists of forests dominated by black spruce (Picea mariana (Mill.) B.S.P.)...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده ادبیات و علوم انسانی 1392

آب حاصل از بارش منبع تأمین نیازهای بی شمار جانداران به ویژه انسان است و هرگونه کاهش در کم و کیف آن مستقیماً حیات موجودات زنده را تحت تأثیر منفی قرار می دهد. نوسان سال به سال بارش از ویژگی های اساسی و بسیار مهم بارش های سالانه ایران محسوب می شود که آثار زیان بار آن در تمام عرصه های اقتصادی، اجتماعی و حتی سیاسی- امنیتی به نحوی منعکس می شود. چون میزان آب ناشی از بارش یکی از مولفه های اصلی برنامه ...

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