Tag Archive | Drought

Temporal trend calculation of di (drought index) and comparison of two methods of IDW and KRG as important spatial analysis tools – JBES

DroughtMaryam Rashidfar, Hassan Ahmadi, Gholamreza Zehtabian

Department of Agricultural and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran, Iran

Department of Agricultural and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran, Iran

Collage of Natural Resources, University of Tehran, Karaj, Iran

Key words: Drought, drought index, temporal trend, spatial analysis, DI.

Abstract

Drought is one of the main natural causes of agricultural, economic and environmental damage. The objective of this study is to provide a comparative spatial analysis by using IDW and KRG methods in Taleghan Watershed in Iran with the view to identifying trends and onset of drought. Continue reading

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The study of climate change in Mazandaran Province using the limit indices of temperature and precipitation – JBES

Mazandaran,Razaghian Hadi, Shahedi Kaka, Haghshenas GatabiRahman Rahman Ali, Kheirollah Poor Saraee Ahmad

Department of Watershed Management Engineering Sari Agricultural Sciences and Natural Resources University and Instructor, Dept. of Natural Resources and Environmental Engineering, Payam Noor University and, 19395-4697, Tehran, Iran

Department of Agricultural Sciences and Natural Resources Department, Sari University, Iran

Department of Natural Geography, Mazandaran Province Meteorological Department, Fourth Kilometers of Sari-Qaemshahr Road, Iran

Key words: Mazandaran, climate change, drought, SPI.

Abstract

In recent years, we could rarely find a day in which the mass media do not release news and reports about natural disasters such as intensive storms, flood, drought and their heavy damages to catchments and human’s environment. Continue reading

Index of drought and wet years using the percentage of normal (PNPI) and Nietzsche Semnan – JBES

DroughtSahar Ghafari, Rahim Rezaie, Esfandiar Jahantab

Range Management, Faculty of Natural Resources, University of Tehran, Karaj, Iran

Combat desertification, Faculty of Natural Resources, University of Esfahan, Esfahan, Iran

Young researchers club, Dehdasht branch, Islamic Azad University, Dehdasht, Iran

Key words: drought, wet, Percent of Normal Precipitation Index (PNPI) , Nietzsche and Semnan.

Abstract

Hazards such as drought, which is affecting all aspects of life and the environment, so understanding the sources and across different environments, can be an important step in resource management. Continue reading

Utilisation of weather forecast information, herd and feed resources management strategies by pastoral and agro-pastoral communities in response to drought

dcp_8350Swidiq Mugerwa, Stephen Byenkya, Emmanuel Zziwa

National Livestock Resources Research Institute, Uganda

Bulindi Zonal Agricultural Research and Development Institute, Uganda

Association for Strengthening Agricultural Research in Eastern and Central Africa, Uganda

Key words: Drought, adaptation, pastoralists.

Abstract

Pastoralists’ planning and response to droughts in Buliisa and Nakasongola Districts through utilization of weather forecast information, herd and feed resources management was examined. Semi-structured questionnaires were administered to 100 respondents and the responses were used to compute percentages, generate graphs and charts using XLSTAT (2013). The study revealed that 50% and 54.8% of the respondents in Buliisa and Nakasongola respectively utilized both conventional and traditional weather forecast information. However, the respondents regarded conventional weather forecasts as unreliable and often too general to be of practical use. Limited indigenous knowledge to predict weather based on traditional indicators was the main constraint to utilization of traditional weather forecasts. Despite the increased occurrence and severity of droughts, majority of respondents in Buliisa (59.7%) and Nakasongola (72.4%) did not practice any specific adaptive measure.

banner_001However, the few households that executed drought adaptive interventions noted that migration of herds in search of forage and water resources was the common adaptive strategy to drought and drought-induced forage scarcity. High prevalence of diseases and crop-livestock conflicts were noted as the major constraints during herd migration. The study therefore aggitates for more farmer to farmer dissemination of indegenous knowledge to improve farmers’ capactity in predicting weather based on tradiotnal indicators. The study is also suggestive that veterinary service delivery structures tailored to spatial and temporal herd movements be established to counteract the high prevalence of diseases during migrations. Further, the study calls for demarcation and protection of migratory corriodors from cultivation to mitigate livestock-crop conflicts during migrations.

Get the original articles in Source: Volume 4, Number 1, January 2014 – JBES

Published By: Journal of Biodiversity and Environmental Sciences (JBES)

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Effects of some environmental factors on annual weed shepherd’s purse (Capsella bursa-pastoris (L.) Medik.) – JBES An Open Access Research Journals

By Rouhollah Amini

Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz, Tabriz, 5166616471, Iran

Key words: Germination, Drought, Salinity, Seedling dry weight, Shepherd’s purse.
Abstract
Shepherd’s purse (Capsella bursa-pastoris (L.) Medik.) is an annual weed species with a wide distribution in cereals of East Azarbaijan, Iran. Tow experiments were carried out based on randomised complete block design with four replications in Tabriz, Iran in 2014 to evaluate the effects of salinity and drought stress on shepherd’s purse germination and early seedling growth. The salinity levels were included 0, 4, 8, 12, 16 and 20 dS m-1 (deci Siemens per meter) sodium chloride (NaCl). The drought stress levels were included 0,-0.4,-0.8,-1.2,-1.6 and-2.0 MPa osmotic potentials were obtained by polyethylene glycol 8000 as osmotica.

Results indicated that the effect of salinity was significant on seedgermination percentage and rate, seedling root and shoot length and seedling dry weight. The all traits reduced significantly by increasing the salinity level. In salinity of 20 dS m-1 the germination% of shepherd’s purse was <35 and the seedling dry weight reduced 65% in comparison with control (0 dSm-1). Also the effect of drought stress was significant on seed germination, seedling length and seedling dry weight and all the traits decreased by increasing the osmotic potential. The germination% of shepherd’s purse seeds in osmotic potential of-2.0 MPa was < 32 and the reduction in seedling dry matter was > 60%. Generally, it could be concluded that drought stress such as limited irrigation and salinity would be effective strategy for reduction in germination and early seedling growth of this annual weed species. Get the full articles at: http://www.innspub.net/volume-6-number-5-may-2015-jbes/

Journal Name: Journal of Biodiversity and Environmental Sciences (JBES)

Publisher Name: International network For natural Sciences (INNSPUB)