摘要
本文论述了草原化荒漠区在之灌溉条件下,仅依靠自然降水,植物生长与水分平衡的关系,指出吸湿凝结水是地表植被,尤其是对土著植物,隐花植物,微生物有一定侵润和水分的补给作用。对线根性一年生植物也有滋养意义。对强化固沙植物,固沙植物的生化活性、生物循环和能量转化有相当积极的生态意义。
16 km artificial ecological protective system,laying emphasis on vegetable
dune stabilization, has successfully been established under non-irrigated
condition in Shapotou region of steppe desert zone, where the annual
rainfall ranged from 170-190mm. Hygroscopically condensed vapor is an
jmportant parameter in the study of the relations between plant growth
and water balance. It involves both molecular hygroscopic process and
thermodynamic proclss and may exceed the maximum hygroscopic moisture
content in value. In the night of autum the maximum depth affected by
vapor hygroscopic effect and condensation varied between 7-9 cm. As a
rule, it condenses in thenight and releases in the daytime. Microclimatic
enviromnent controls both hygroscopic condensation process and ft content.
Wind speed near groud surface, temperature, relative humidity graidnet,
saturated vapor pressure difference, dew point and temperature gradient
in sand dunes are also invo lvein and control the thermodynamic processes.
As a guarantee factor of water supply the amount of hygroscopically
condensed vapor is limited, however, it can wet and nourish the native
plants,cryptograms,microbe and shallow-root annuals in addition to improve
the biochemical characteristics of sand-fixing plant, biological circulation
and energy conversion.
In the arid zone hygroscopically condensed vapor is an input component
of water balance.
出处
《干旱区资源与环境》
CSCD
1992年第2期63-72,共10页
Journal of Arid Land Resources and Environment
关键词
吸湿凝结水
微气象
水分
Condensed vapor
Micrometeorology
Moisture
