نتایج جستجو برای: climatic factors
تعداد نتایج: 1102923 فیلتر نتایج به سال:
Abstract Fire is a key ecosystem process with more than half the world's land surface potentially subject to fire. A aspect of fire ecology regime, frequency an important component. appears be increasing in some ecosystems, but decreasing others. Such temporal and spatial variability highlights importance effectively quantifying spatiotemporal changes for particular environments. We modeled ove...
Astragalus mongholicus Bunge (Fabaceae) is an important plant source of the herbal drug known as Radix Astragali, which is used worldwide as a medicinal ingredient and a component of food supplement. Russian Federation, Mongolia, Kazakhstan, and China are the main natural distribution areas of A. mongholicus in the world. However, the quality of medicinal plant varies among different locations....
The study investigated the role of climatic variables and irrigated agricultural on the seasonality of malaria transmission in New Halfa, eastern Sudan. A time-series analysis was performed using monthly climatic variables, monthly water available for irrigation of crops and monthly slide positive rate of malaria during the period 1986-2002. Cases of malaria were reported every month of the yea...
Using National Oceanographic and Atmospheric Administration/Advanced Very High Resolution Radiometer (NOAA/AVHRR) and Climatic Research Unit (CRU) climate datasets, we analyzed interannual trends in the growing-season Normalized Difference Vegetation Index (NDVI) in China from 1982 to 2011, as well as the effects of climatic variables and human activities on vegetation variation. Growing-season...
BACKGROUND Dermatophytosis, and particularly the subtype tinea capitis, is common among African children; however, the risk factors associated with this condition are poorly understood. To describe the epidemiology of dermatophytosis in distinct eco-climatic zones, three cross-sectional surveys were conducted in public primary schools located in the Sahelian, Sudanian and Sudano-Guinean eco-cli...
Wild mushroom foraging has a long tradition in Central European countries. Protein from wild mushrooms is an important part of diets and served historically as meat protein substitute. In view climate change, this source may become scarce. This study investigated the effects temperature precipitation on using Dickey–Fuller test ordinary least squares method. The results Czech Republic show that...
Identification of climatic characteristics affecting the annual yield of Rheum Ribes can be useful in management and development of this species in the rangelands. In this research, the annual yield of this species in Khorasan-Razavi province based on 74 climatic parameters during a ten-year period evaluated and affecting climatic parameters extracted using data mining methods. First, the role ...
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