tailieunhanh - Báo cáo lâm nghiệp: "Complex study of foliage nutrient status in ash fertilized Scots pine stands in Lithuani"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Complex study of foliage nutrient status in ash fertilized Scots pine stands in Lithuania. | JOURNAL OF FOREST SCIENCE 54 2008 5 195-206 Complex study of foliage nutrient status in ash fertilized Scots pine stands in Lithuania I. Varnagirytề-Kabasinskienề1 2 Lithuanian University of Agriculture Akademija Kaunas District Lithuania Lithuanian Forest Research Institute Girionys Kaunas District Lithuania ABSTRACT In Lithuania a typical Scots pine stand under the influence of wood ash and nitrogen fertilization containing different treatments and the control was analyzed. The study aim was to interpret the foliage and soil analyses and to find possible indications in the soil-plant relation in the stand. The analyses of the foliage nutrient status in the Scots pine stand when wood ash with without N was recycled to the forest showed that the significance analyses of changes in the nutrient composition in the soil and needles were the best initial tool for the response evaluation. The comparison of the nutrient concentrations with optimal amounts critical levels of deficiency or target levels for ratios to N and applied graphical analyses could also provide possible indications in the soil-plant relation. Keywords Scots pine needles wood ash nitrogen foliage nutrients The main fertilization trials in Lithuania were carried out for several decades in Scots pine stands growing on sandy soils mostly in nurseries or on poor deflated Arenosols. It has long been known that the most effective impact on pine stands was found after the application of nitrogen N fertilizers. But as the fertility of the site improves N fertilization alone will no longer increase growth because other nutrients begin to limit growth. Thus the general aim of forest fertilization is to improve the growth of a tree stand by adding the complex of nutrients the lack of which is limiting the growth Saarsalmi Malkonen 2001 . At present we raise the idea that the expansion of the consumption of forest biomass for bioenergy causes an increased export of nutrients from the forest because the exported

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