نتایج جستجو برای: rain and drought
تعداد نتایج: 16836092 فیلتر نتایج به سال:
Eucryphia cordifolia Cav. is a long-lived evergreen tree species, commonly found as a canopy emergent tree in the Chilean temperate rain forest. This species displays successive leaf cohorts throughout the entire growing season. Thus, full leaf expansion occurs under different environmental conditions during growing such as air temperature, vapor pressure deficit and the progress of moderate wa...
Precipitation extremes play a key role in flooding risks over the Huaihe River Basin, which is important to understand their hydrological impacts. Based on observed daily precipitation and streamflow data from 1958 to 2009, eight precipitation indices and three streamflow indices were calculated for the study of hydrological impacts of precipitation extremes. The results indicate that the wet c...
Diversification of agricultural systems is a standard suggestion for increasing the resilience of rain-fed subsistence farming to drought. However, grain crops share many physiological characteristics, potentially forming a plant functional type (PFT), a term ecologists apply to groups of species that respond in functionally similar ways to environmental variation. Here we test whether grain cr...
Annually much agricultural productions are lost by natural hazards such as flooding, extreme temperature, and drought. In this research we present a procedure to identify such hazards for rice cropping from remote sensing imagery. Extreme temperature is investigated by comparing actual temperatures with tolerance temperatures during the growing stage. Drought is investigated using the evapotran...
Abstract Arid climates are characterized by a summer drought period to which animals seem adapted. However, in some years, the can extend for unusually longer periods. Examining effects of these current extreme weather events on biodiversity help understand climate change, as models predict an increase severity. Here, we examined “unusual” extended soil invertebrate prey availability and diet c...
Xylem failure via gas embolism (cavitation) induced by water stress was investigated in the palm Rhapis excelsa (Thumb.) Henry. Xylem embolism in excised stems and petioles was detected using measurements of xylem flow resistance: a decrease in resistance after the removal of flow-impeding embolisms by a pressure treatment indicated their previous presence in the axis. Results supported the val...
vegetation that is allowed to naturally decompose isn’t realized by many ranchers and some range mangers. Mulch plays a critical role in soil-water relationships that is often overlooked. This, coupled with current drought conditions in the southwestern United States justifies a consideration of the importance of mulch on rangelands. Several early classic studies (reviewed in this article) reve...
This study identified single nucleotide polymorphism (SNP) markers associated with 15 complex traits in a breeding population of barley (Hordeum vulgare L.) consisting of 137 recombinant chromosome substitution lines (RCSL), evaluated under contrasting water availability conditions in the Mediterranean climatic region of central Chile. Given that markers showed a very strong segregation distort...
Drought is a major natural disaster that causes reduction in rain-fed maize yield. Agricultural drought risk assessment conducive to improving regional management ability, thereby reducing food security risks and economic losses. Considering the complexity of research, an increasing number researchers are focusing on multiple-criteria decision-making (MCDM) method. However, applicability MCDM m...
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