کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7065128 | 1459837 | 2013 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Productivity and cost of biomass harvesting for energy production in coppice natural stands of Quercus pyrenaica Willd. in central Spain
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Productivity and cost of biomass harvesting for energy production in coppice natural stands of Quercus pyrenaica Willd. in central Spain Productivity and cost of biomass harvesting for energy production in coppice natural stands of Quercus pyrenaica Willd. in central Spain](/preview/png/7065128.png)
چکیده انگلیسی
Biomass growing stocks, harvesting productivity and costs of energy production, were studied in thinnings of Quercus pyrenaica. Eleven forest sites were selected in coppices located in Castilla y León (Spain). Three systems were employed for harvesting: a mechanised whole tree harvesting (WTH) system, which included chipping at landing; a fully mechanised cut-to-length (CTL) harvesting system for firewood; and a semi-mechanised CTL system with manual felling and bunching. Three WTH trials had a hauling off 34.7-44.1 oven-dried tonnes (odt) haâ1. In contrast, only 11.6-30.0 odt haâ1 were obtained in the other eight CTL trials. Biomass weight equations for stems and whole trees were fitted. Worker operations were time-studied using software designed by the authors. The WTH system reached maximum productivity rates of 3.9 oven-dried tonnes per productive hour (odt hâ1) for the felling and bunching operation and 6.9 odt hâ1 for the forwarding operation. The mechanised CTL harvesting method achieved a productivity range of 1.3-0.5 odt hâ1 for the harvesting operation. Furthermore, the average forwarding productivity was 7.3 odt hâ1. Motor-manual felling and crosscutting in the CTL system accomplished a productivity range of 0.7-1.9 odt hâ1. Manual bunching resulted in similar values. The lowest firewood unit cost for trees with 10 cm of diameter at breast height (DBH) was 62.0 â¬Â odtâ1 using a semi-mechanised CTL system. Under similar conditions, this cost was 85.2 â¬Â odtâ1 for the mechanised CTL system. Finally, the cost corresponding to chips at landing from WTH sites (average DBH = 10 cm) was 65.3 â¬Â odtâ1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biomass and Bioenergy - Volume 56, September 2013, Pages 221-229
Journal: Biomass and Bioenergy - Volume 56, September 2013, Pages 221-229
نویسندگان
Rubén Laina, Eduardo Tolosana, Yolanda Ambrosio,