tailieunhanh - Báo cáo lâm nghiệp: "Saturated hydraulic conductance of forest soils affected by track harvesters"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Saturated hydraulic conductance of forest soils affected by track harvesters. | JOURNAL OF FOREST SCIENCE 57 2011 7 321-339 Saturated hydraulic conductance of forest soils affected by track harvesters K. Rejsek1 P. Holcíková1 V. Kuraz2 A. Kucera1 P. Dundek1 P. Formanek1 V. Vranová1 1Department of Geology and Pedology Faculty of Forestry and Wood Technology Mendel University in Brno Brno Czech Republic 2Department of Irrigation Drainage and Landscape Engineering Faculty of Civil Engineering Czech Technical University in Prague Prague Czech Republic Abstract The exact data from the field of soil mechanics from specific forest stands exposed to forestry mechanization operation were obtained. Field surveys were performed on four study plots within the Krtiny Training Forest Enterprise Masaryk Forest followed by laboratory analyses of the collected soil samples aimed at evaluation of the impacts of Zetor 7245 Horal System PONSSE ERGO 16 harvester and Gremo 950 forwarder on the compaction of upper soil horizons as well as on the dynamics of soil saturated hydraulic conductivity. A specific objective of the performed investigation was to assess the influence of the used hauling skidding technology on measurable parameters of soil mechanics with the emphasis on a possibility to apply the Guelph permeameter for direct study of soil saturated hydraulic conductivity. In the measurement points affected by machinery operation the impact of the changed soil structure on the values of saturated conductivity is very well noticeable - on study plots No. 3 and 4 the values decreased by one order of magnitude from X 10-5 m-s-1 to X 10-5 m-s-1 specifically i on study plot No. 3 and from X 10-5 m-s-1 to X 10-5 m-s-1 and ii on study plot No. 4 on study plot No. 2 even by two orders . from X 10-5 m-s-1 up to X 10-5 m-s-1. After the operation of a universal wheeled tractor at the Babice nad Svitavou locality the situation partially improved by one order to X 10-5 m-s-1 similarly like at the Rudice locality to X 10-5 m-s-1. .