این سایت در حال حاضر پشتیبانی نمی شود و امکان دارد داده های نشریات بروز نباشند
Journal of Agricultural Science and Technology، جلد ۱۸، شماره ۱، صفحات ۱۵۵-۱۷۰
عنوان فارسی
چکیده فارسی مقاله
کلیدواژه‌های فارسی مقاله
عنوان انگلیسی Evaluation of K-tree Distance and Fixed-Sized Plot Sampling in Zagros Forests of Western Iran
چکیده انگلیسی مقاله Three k-tree distance and fixed-sized plot designs were used for estimating tree density in sparse Oak forests. These forests cover the main part of the Zagros mountain area in western Iran. They are non-timber-oriented forest but important for protection purposes. The main objective was to investigate the statistical performance of k-tree distance and fixed-sized plot designs in the estimation of tree density. In addition, the cost (time required) of data collection using both k-tree distance and fixed-sized plot designs was estimated. Monte-Carlo sampling simulation was used in order to compare the different strategies. The bias of the k-tree distance designs estimators decreased with increasing the value of k. The Moore’s estimator produced the smallest bias, followed by Kleinn and Vilcko andthen Prodan. In terms of cost-efficiency, Moore’s estimator was the best and Prodan’s estimator was superior to Kleinn and Vilcko’s estimator. Cost-efficiency of k-tree distance design is related to three factors: sample size, the value of k, and spatial distribution of trees in a forest stand. Moore’s estimator had the best statistical performance in terms of bias, in all four-study sites. Thus, it can be concluded that Moore’s estimator can have a better performance in forests with different tree distribution.
کلیدواژه‌های انگلیسی مقاله
نویسندگان مقاله h رمضانی |
department of forest resource management, swedish university of agricultural sciences, slu, se-901 83 ume amp;amp;aring, sweden.

a grafstrom |
department of forest resource management, swedish university of agricultural sciences, slu, se-901 83 ume amp;amp;aring, sweden.

h نقوی |
department of forestry, lorestan university, p. o. box 465, khorram abad, islamic republic of iran.
سازمان اصلی تایید شده: دانشگاه لرستان (Lorestan university)

a فلاح |
sari university of agricultural sciences and natural resources, department of forestry, sari, islamic republic of iran.

sh شتایی |
gorgan university of agricultural sciences and natural resources, gorgan, islamic republic of iran.
سازمان اصلی تایید شده: دانشگاه گلستان (Golestan university)

j سوسنی |
sari university of agricultural sciences and natural resources, department of forestry, sari, islamic republic of iran.

نشانی اینترنتی http://jast.modares.ac.ir/article_13987_382bd29e7606dc1061db1445d3f0f1bf.pdf
فایل مقاله فایلی برای مقاله ذخیره نشده است
کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده
نوع مقاله منتشر شده
برگشت به: صفحه اول پایگاه   |   نسخه مرتبط   |   نشریه مرتبط   |   فهرست نشریات