摘要
荒漠化是包括气候变化和人类活动的多种因素造成的干旱、半干旱及干半湿润地区的土地退化。荒漠化过程包括水蚀、风蚀及由这些动因造成的沉积,自然植被的数量和多样性长期减少或有关的作物产量降低,以及土壤的盐化和碱化等。荒漠化分为荒漠化和潜在荒漠化两大类,前者按其发展程度分为轻度、中度、重度和严重四级。后者按其易发性分为极易、容易、较易和不易四级。最层提出了荒漠化的治理对策和措施。
Desertification means land degradaticn in arid.semi-arid and dry sub-humid areas resulting from various factors,including climatic variation and human activities.Processes of desertifica- tion include water erosion,wind erosion and sedimentation by those agents,long—term reduc- tion in the amount and diversity of natural vegetation,or decrease of crop yield and salinization and sodication of soils.Desertification can be divided into two types,one is the desertification. another is the potential desertification.The former can be further devided into four classes in ac- cordance with its severity,namely slight,moderate,severe and very severe.Likewise.the latter can be subdivided into four classes based on its susceptibility,namely very easily-occurring,easi- ly-occurring,relatively easily-occurring and not easily-occurring.Combating measures of deserti- fieation include:1.Making desertification assessment and working out the rehabilitation strate- gies:2.Strengthening management to the potential desertification land:giving the priority to the rehabilitation of slightly and moderately desertified lands and selectively harnessing the severely desertffied land in accordance with the demand of the national economic development;3.Differ- ent measures should be adopted in the light of different natural conditions(arid.semiarid and subhumid zones).
出处
《自然灾害学报》
CSCD
1996年第1期105-111,共7页
Journal of Natural Disasters
关键词
荒漠化
土地退化
治理
Desertffication
Land degradation
Combating
