نتایج جستجو برای: rain and drought

تعداد نتایج: 16836092  

صلاحی, برومند, فریدپور, مجتبی,

Drought is the most important natural disaster, due to its widespread and comprehensive short and long term consequences. Several meteorological drought indices have been offered to determine the features. These indices are generally calculated based on one or more climatic elements. Due to ease of calculation and use of available precipitation data, SPI index usually was calculated for any des...

2016
David Lyon Maria Angeles Castillejo Vlora Mehmeti-Tershani Christiana Staudinger Christoph Kleemaier Stefanie Wienkoop

Climate change in conjunction with population growth necessitates a systems biology approach to characterize plant drought acclimation as well as a more thorough understanding of the molecular mechanisms of stress recovery. Plants are exposed to a continuously changing environment. Extremes such as several weeks of drought are followed by rain. This requires a molecular plasticity of the plant ...

2016
Dharmendra Singh Chandan Kumar Singh Ram Sewak Singh Tomar Jyoti Taunk Ranjeet Singh Sadhana Maurya Ashish Kumar Chaturvedi Madan Pal Rajendra Singh Sarawan Kumar Dubey Tapan Kumar Mondal

The success of drought tolerance breeding programs can be enhanced through molecular assortment of germplasm. This study was designed to characterize molecular diversity within and between Lens species with different adaptations to drought stress conditions using SSR markers. Drought stress was applied at seedling stage to study the effects on morpho-physiological traits under controlled condit...

2008
Ronald E. Barry

The demographics of syntopic populations of Procavia capensis (rock hyrax) and Heterohyrax brucei (yellowspotted hyrax) were studied during a drought from October 1991 to May 1992 in the Matobo National Park (MNP), Zimbabwe. Pups comprised >27% of the samples after a synchronous March April 1992 birth event in which about 50% of the adult females participated. The timing and frequency of partur...

Journal: :پژوهش های جغرافیای طبیعی 0
بهمن رمضانی گورابی فرزاد شیرزاد

decreasing changes of climatic elements such as: daily precipitation, weekly precipitation, seasonal precipitation and annual precipitation can be toward to drought phenomena. the recognition it and planning for passing it, could be decreasing of disasters, because create of drought is slow but it effects is very damages. the aim of this paper is descriptive analyze and it type of research is a...

Journal: :Jurnal Forum Teknik Sipil 2022

Due to the low rainfall, it is relatively uneven in each sub-district Timor Tengah Selatan (TTS) Regency. It causes some rivers be drought-prone dry season. This study aims determine largest drought index and map distribution South Central The analysis uses Standardized Precipitation Index (SPI) Method. data used monthly rainfall for ten years (2009-2018) of rain stations. Then, mapping using A...

2009
Kerrie M. sendall

Leaf gas exchange, water potential, and specific leaf area of two tropical semi-deciduous tree species, Brosimum lactescens S. Moore and Tovomita schomburgkii Planch & Triana, were quantified to establish how these properties were affected by seasonal variations in rainfall and leaf canopy position. The study was conducted at a site near Sinop Mato Grosso, Brazil, which is located within the ec...

Journal: :The New phytologist 2008
Asko Noormets Steve G McNulty Jared L DeForest Ge Sun Qinglin Li Jiquan Chen

* Climate change projections predict an intensifying hydrologic cycle and an increasing frequency of droughts, yet quantitative understanding of the effects on ecosystem carbon exchange remains limited. * Here, the effect of contrasting precipitation and soil moisture dynamics were evaluated on forest carbon exchange using 2 yr of eddy covariance and microclimate data from a 50-yr-old mixed oak...

2015
Sigrid Netherer Bradley Matthews Klaus Katzensteiner Emma Blackwell Patrick Henschke Peter Hietz Josef Pennerstorfer Sabine Rosner Silvia Kikuta Helmut Schume Axel Schopf

Drought is considered to enhance susceptibility of Norway spruce (Picea abies) to infestations by the Eurasian spruce bark beetle (Ips typographus, Coleoptera: Curculionidae), although empirical evidence is scarce. We studied the impact of experimentally induced drought on tree water status and constitutive resin flow, and how physiological stress affects host acceptance and resistance. We esta...

2017
Silvas J. Prince Mackensie Murphy Raymond N. Mutava Lorellin A. Durnell Babu Valliyodan J. Grover Shannon Henry T. Nguyen

We tested the hypothesis that increasing the number of metaxylem vessels would enhance the efficiency of water uptake in soybean (Glycine max) and decrease the yield gap in water-limited environments. A panel of 41 soybean accessions was evaluated in greenhouse, rainout shelter, and rain-fed field environments. The metaxylem number influenced the internal capture of CO2 and improved stomatal co...

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