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Showing 3 results for Type of Study: Applicable

Javad Eshaghi Rad,
Volume 1, Issue 1 (9-2014)
Abstract

Paulownia species, which are fast-growing endemic species in China and Japan, have been used for establishing green space and park and inter-cropping with many kinds of crops in many countries. The aim of this study was to investigate the effect of irrigation on one-year Paulownia tomentosa seedlings in the climatic and edaphic condition of West Azarbayjan, Iran. Random factorial experimental design was applied with 3 irrigation levels (5, 10 and 15 liter) and 2 irrigation period treatments (3 and 6 days) with 10 replicates. Seedling’s height increment was measured at the end of each month during the growth season. The maximum height growth of Paulownia tomentosa in different treatments was observed in the first month and the seedling height was not considerably raised during the upcoming months. The seedlings of the treatment which were irrigated with 5 liters and with 6 days interval were dried and the seedlings of the treatment with 5 liters irrigation and with 3 days interval had the minimum mean of total height (8.7cm) in comparing with other treatments (10.9-11.8cm). Furthermore, with increasing the irrigation amount and decreasing the irrigation interval, the seedling’s height growth was not altered significantly. Therefore we concluded that the best irrigation regime for suitable height growth of one-year Paulownia tomentosawas with 10 liters irrigation and with 6 days interval, for decreasing the cost and water consumption.
Sabrieh Moradi , Roghayeh Zolfaghari ,
Volume 2, Issue 2 (3-2016)
Abstract

Morphological characteristics of individuals are due to hereditary and environmental factors. Regarding to the importance of leaf morphology in systematics investigations and bearing up the effects of environmental variations, especially altitudinal variations on these traits, the differentiation feasibility of brant oak in a restricted altitudinal gradient is investigated. A total number of 400 leaves from 40 individual ramets in Armarde, in an altitudinal ranges from 1580 to 1844 meters above sea level were sampled and 29 quantitative and qualitative traits were measured. The results revealed that the number of teeth and the shape of leaf at lower altitudes are lesser than higher altitudes. Also, leaf base angle has a negative and significant correlation with the altitude. In two altitudinal classes, the shape of leaf tip and the angle of midrib and vein, showed the lowest plasticity and coefficient of variation with respect to environmental conditions. Ramets were classified in three different classes based on cluster analysis and the separator traits were the maximum leaf width, leaf area and sinusoidal angle. Considering the fact that the separator traits would not showed any significant association with altitude,  it seems that some variations might be likely due to physiological response of leaves to environmental variations. However, itchr('39')s more likely that the occurrence of inter and intra specific hybridization between brant´s oak species would culminated in separation of the individuals.


Fatemeh Babazekri, Mehdi Nooripoor, Zeinab Sharifi,
Volume 3, Issue 2 (3-2017)
Abstract

Background and objectives: Forests and rangelands are the most important natural resources of a country. In addition, they have a special position in the ecosystem of the earth, and, thus, they play an essential role in soil conservation as well as climate moderation. However, serious and, sometimes irreparable, damage has been ocuured by both natural and man-made factors. One of the areas where degradation of rangelands and forests could clearly be recognized over the past years is the central District of the Dena County. Therefore, the purpose of the current study was to identify and analyze factors affecting the degradation of rangelands and forests in the central District of Dena County.
Materials and methods: A mixed research method including qualitative and quantitative methods was used in two phases, using interview and questionnaire as instruments. In the first phase of the study, the population comprised the villagers and officers of the Department of Agriculture, Dena County and also the Provincial Department of Natural Resources in Kohgiluyeh and Boyer-Ahmad Province. In the second phase, the population consisted of the academic faculty members of local universities who were native and were familiar with the region. Snowball sampling technique was adopted in both phases of the study.
Results: Factors affecting the degradation of rangelands and forests were identified in the first phase of the study. These factors comprised organizational factors (monitoring, supportive and administrative), infrastructural, socio-cultural, legal, economic and natural factors. Following that, in the second phase of the study, the participants were asked to rank the factors identified based on AHP procedure principles. The results showed that lack of grazing management in monitoring factors,  less governmental support for natural resources in supportive factors,  administrative corruption in administrative factors, road construction in infrastructural factors, poor cultural patterns in socio-cultural factors, lack of appropriate legal actions when faced with illegal possession in legal factors,  rural poverty in economic factors, and finally drought in natural factors were the most important factors contributing to the problem of degradation.
Conclusion: Finally, out of the recommendations made to prevent the degradation of forests and rangelands, one can mention the employment of native people to improve the management of rangelands and forests in areas of guarding and conservation affairs of natural resources. In addition, for the purpose of constructing roads, building power plants, etc. it is necessary to seek the expert advice of engineers with expertise in road construction, civil engineering and rural development.
 

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