tailieunhanh - Báo cáo lâm nghiệp: "Changes in Austrian pine forest floor properties in relation with altitude in mountainous areas"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Changes in Austrian pine forest floor properties in relation with altitude in mountainous areas. | JOURNAL OF FOREST SCIENCE 54 2008 7 306-313 Changes in Austrian pine forest floor properties in relation with altitude in mountainous areas O. Sevgi H. B. Tecimen Department of Soil Science and Ecology Faculty of Forestry Istanbul University Bahẹekôy - Istanbul Turkey ABSTRACT Altitudinal studies has become of interest to ecologists concentrated on functional alterations aiming to clarify the effects of limiting factors. Nutrient element release from forest floor FF decomposition is suppressed by those factors such as low temperature shortened vegetation period concluding FF accumulation at high elevation fields. To draw out a response to the FF decomposition issue FF layers as leaf fermentation L F and humus H were collected from 37 representative sample plots along an altitudinal gradient from 1 400 m to 1 710 m on Kaz Balikesir-Turkey mountain. Mass pH organic matter OM and total nitrogen Nt contents of FF were investigated to explain the relation between decomposition and altitudinal effects. The results revealed that total FF mass and L F H sub-fraction masses through elevation show an insignificant relation with the altitude. No significant difference was found between the altitudinal groups in the OM content of L F. Besides there are significant negative correlations between OM contents of L F and H layers and altitude with the coefficient values P and P respectively. The Nt content of L F layer also increases through the elevation revealing a medium correlation with altitude P . The increasing Nt and decreasing OM contents show better decomposition rates at higher sites regardless of the altitude induced climatic changes. We assume that the forest floor accumulation under tree canopies provides a better decomposition relying on the microclimatic environment mediated by tree canopies in spite of the altitude. Keywords altitude Pinus nigra forest floor decomposition organic matter humus The release of nutrients from litter .