摘要
我国西北干旱区近四十年来,绿洲环境有所改善,而绿洲外的广大地区环境在恶化。本文论述了造成环境变化的原因及其后果,并提出了保护和改善环境的对策。
The arid lands in the Northwest China include these units in physical
geography, namely, Tarim Basin, Junger Basin, Caidam Basin, the Hexi
Corridor region and the Alashan Highlands etc..The arid climate there has
been long established, and shows no any evident improvement currently.In
recent 40 years with the expansion of the oases related to the human acti-
vities, the environment within them has been improved, on the other hand,
the outside cases have been in deterioration.
There are 42 oases with irrigating systems in Tarim, 28 in Junger, 19
in the corridor region with large scale and over 10 in Caidam with small
scale.The population has risen as much as 3.4 times, and the area of the
farmland enlarged 3.14 times over the 40 years.This leads to a favourable
promotion in eovironment.
Meanwhile the environment has been also worsened with the careless
development.As a result, the water supplement to the region of the lower
stream has been reduced, causing the curtailment of stream flowing length
and the dry up of lakes at the river tails; the area of forests and grass-
lands decreased; the salinized farmland increased and the desertification
strengthened.
The main problem in arid lands is obviously how to resonablly develop
and utilize the water resources.Only when some policies are made for pro-
per water using, much attention is paid to the ecoiogical environment and
the local conditions are taken into consideration, can the good results be
gained in social, economic and ecological system in the arid lands.
出处
《干旱区资源与环境》
CSCD
1992年第3期39-47,共9页
Journal of Arid Land Resources and Environment
关键词
干旱区
绿洲化
环境劣变
Arid Land
Oasis
Environment
Changes Towards Worse
