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Showing 2 results for Subject: General

Yaser Mohammadi, Vahid Etemad,
Volume 2, Issue 1 (9-2015)
Abstract

Rural households’ involvement in forest conservation and reforestation depends on their perception towards forest perceived benefit which is attributed to demographic characteristics of the households head. In order to test this hypothesis, a study was run on rural households surrounded by Chahartagh forest reserve (N=600) which its livelihood was based on forest resources. About 196 rural households were determined as the research sample using Cochran’s formula through Simple random sampling procedure. Also, a researcher-designed questionnaire was used to collect data which its content validity confirmed by expert opinions and its reliability confirmed by Cronbach alpha coefficient. Collected data were analyzed by two software of IBMSPSS21 and LISREL8.5. The results showed that rural households’ perceptions towards forest are directly related to benefits they perceived from the forest. Perceptions towards forest benefits was summarized into three categories of perceptions towards forest economic, environmental and social benefits which economic benefit was recognized as the most important benefit perceived by respondents. From rural households’ perspective, the income gained from timber and non-timber products were the most important economic benefits of forests. Structural equation modeling results also revealed that rural household’ perception towards forest benefits differ among rural households according to their demographic characteristics. It observed that the younger, higher literacy level, had the higher income level and also, they had the more positive perception toward forest benefit. Also, each household’s head that was member of rural local institutions, had a corporation with NGOs and had participation into active groups to conserve forests had more positively perceived forest benefits.


Negin Behnia, Sayed Yousef Erfanifard, Sayed Rashid Fallah Shamsi, Sayed Aliakbar Moosavi,
Volume 2, Issue 2 (3-2016)
Abstract

The aim of this study was to assess the efficiency of cokriging method in comparing to kriging to map biophysical properties of wild pistachio trees in Zagros forests. A 45 ha stand, covered with wild pistachio trees was chosen in FiroozAbad wild pistachio research site in Fars province. 87 circular plates with 800 m2 area were selected based on a 72 × 72 m2 grid. Biophysical properties (height, diameter at breast height, trees per ha, and canopy cover percent) of all wild pistachio trees were measured in each plot. Kriging and cokriging methods were then used to map each biophysical property. The results showed that mean error and root mean squared error of height, diameter at breast height, and trees per ha of cokriging method were less than kriging method. The regression coefficients of height, diameter at breast height, and trees per ha of cokriging method were also greater than the kriging method that showed the efficiency of the cokriging method in the improvement of estimation of trees’ biophysical properties. The amount of root mean squared error and regression coefficient were slightly better for canopy cover percent in kriging, though, they were not significant. In general, it was concluded that the maps of biophysical properties can be obtained with suitable accuracy and precision using Cokriging method.



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