environ. |
desertification 1. The development of desert conditions as a result of human activity or climatic changes. 2. The process of land damage which allows the soil to spread like a desert in arid and semi-arid regions. There is a loss of vegetative cover and the soil deteriorates in texture, nutrient content and fertility. Desertification affects the lives of three-quarters of the world's population, 70% of all drylands and one quarter of the total land area of the planet. There are many reasons for desertification, but the majority are caused by human activities, overgrazing, deforestation, poor land management and over-exploitation. Agenda 21 states that the priority in combating desertification should be establishing preventive measures for lands that are not yet, or are only slightly, degraded (1. 由于人类活动或气候改变形成沙漠的情况。 2.在干旱和半干旱地区,土壤像在沙漠地区一样四处飞散的土地损害过程。 植被的丧失和土壤结构、营养和肥力的恶化在此处发生。 沙漠化影响了世界四分之三的人口,其占了干地的70%和地球四分之一的土地。 造成沙漠化的原因很多,但主要是由人类活动、过度放牧、森林垦伐、不良土地管理和过度开采所造成。 21世纪宣言指出战胜沙漠化的首要任务是对尚未或仅稍微恶化的土地进行预防性的措施。) |