科尔沁沙地植被逆向演替与防治对策研究

科尔沁沙地是我国半干旱地区生态环境较脆弱而敏感的地带 ,当前 ,在全球气候变化背景下以及剧烈的人类活动影响下 ,该区的干燥程度日趋加重 ,植被逆向演替十分明显 ,表现在 :在同一热量带的不同地域 ,随着降水量减少和沙漠化程度加重 ,植被演替由疏林草原向荒漠化方向发展 ;在各个环境梯度带 ,由于阳坡更加裸露 ,蒸发作用强烈 ,比阴坡更为干燥 ,因而沙丘植被演替分化为阳坡系列和阴坡系列 ,前者向荒漠化方向发展 ,后者向草原化方向发展。植被逆向演替将妨碍社会经济的发展和生态环境的改善 ,应当给予高度重视并采取防治与保护措施。

Study on Control Countermeasures and Retrogressive Succession of Vegetation in Kerqin Sandy Land

Kerqin Sandy Land is one of the fragile and sensetive belts of ecologic environment in the semiarid area of our country. Its aridity is increasing with the global climate change and the intensive activities of human being. Under these conditions, retrogressive succession of vegetation is much obvious, it shows:the vegetation succession tends to from open woodland-steppe to desertification direction in different places of the same quantity of heat belt with decreasing precipitation and increasing desertization;within each environment gradient delt, becouse sun-slope exploses under the sun more than shade-slope,the vegetation succession devides into sun-slope and shade-slope series the former develops in the direction of desertification and the latter in the direction of grassland. The retrogressive succession of vegetation will greatly hinder the developments of seciety and economy, obstructing the improvement of ecologic environment, therefore, it should be paid more attention to and rationable measurements must be taken to change in the direction of progressive succession. Six Suggestions have been put forword in the paper.