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Inner Mongolia Agricultural University (2006)

An Experimental Study of Anti-Wind Erosion Capacity of Conservation Farming System in the Northern Foot of Yinshan Mountain

刘汉涛; Liu Han Tao

Titre : An Experimental Study of Anti-Wind Erosion Capacity of Conservation Farming System in the Northern Foot of Yinshan Mountain

Auteur : 刘汉涛; Liu Han Tao

Grade : Doctoral Dissertation 2006

Université : Inner Mongolia Agricultural University

Résumé partiel
The arid, semi-arid area in the northern part of China is a typical region where the desertification process spreads rapidly, ecological environment appears most fragile, living standards of people there, generally speaking, is rather low and the wind erosion and resulted desertification have become the most conspicuous problem restricting the continuous development of local agriculture. The author of this article conducted an experimental study of anti-wind erosion capacity of conventional farming and conservation farming land by a movable wind erosion tunnel designed by Inner Mongolia Agricultural University in Wuchuan County located in the northern foot of Yinshan Mountain, appraised the anti-wind erosion capacities of different cultivation measures, verified the anti-wind erosion effect of conservation farming technology and provided the scientific basis for the selection of conservation farming measures (including the decision of stubble height and residue coverage etc.) through making a contrast investigation on the wind erosion level, distribution of transported mass in space and the aerodynamic roughness of field surface of the conventional farming and conservation farming land at the different wind speeds of pure wind and sand-carried wind before and after seeding operation respectively.1. The earth grains on the field surface chiefly concentrates in the air layer close to ground surface to move under various wind speeds. The wind erosion level and the height of sand blown up will increase with wind speed being speeded, and decrease with the erect stubble being heightened and residue coverage broadened. Taking the height of ridge in a conventional farming field and the height of residue in the conservation farming field as the boundary respectively, the air current in lower level is intensely affected by plant monomer and the distribution of earth particles suspended is air along vertical height displays an obvious randomness while the air current in upper level is slightly affected by plant monomer, the variation of wind erosion level is mainly conditioned upon the characteristics of entire vegetation layer, and the distribution of the earth particles suspended in air along height varies regularly in accordance with index law with the change of vegetation layer’s characteristics.2. When the height of erect stubble and residue coverage are certain, the wind-blown mass increase with the increase of wind speed in accordance with index law

Mots clés : Agricultural Engineering; Conservation Tillage; Wind Erosion; Seed; Movable Wind Erosion Tunnel;

Présentation (CNKI)

Page publiée le 5 mai 2013, mise à jour le 23 avril 2018