Expect for the rainfall, hygroscopic and condensate water as the main source of moisture in arid and semi-arid regions, has great significance for eco-hydrology. In this experiment, the contents of hygroscopic and condensate water in biological soil crusts in alpine sandy artificial vegetation restoration area of Gonghe basin were set as the research object. We used micro-lysimeters to observe hygroscopic and condensate water in alpine sandy lands from May to September in 2018, recorded the change rule of air humiture and soil humiture in the meantime. The results showed that hygroscopic and condensate water in different types of biological soil crust were different: moss crusts > algae crusts > physical crusts > sand, and the difference was not related to the date. The relationship between near-surface air humidity and the contents of hygroscopic and condensate water was positively correlated. And the relationship between near-surface air temperature, soil temperature, soil humidity and the contents of hygroscopic and condensate water was negative, and the correlation was not related to surface types. The main component analysis showed that the condensation process of hygroscopic and condensate water was mainly affected by near-surface air temperature and humidity, and the cumulative contribution rate was 85.294%. The main generation time of hygroscopic and condensate water in growing season was 19 o'clock to 7 o'clock the next day, during this period, the changes of condensation speed was volatile. The speed of hygroscopic and condensate water rose constantly at 19 o'clock to 23 o'clock, and the rising trend was unconnected with near-surface air temperature and humidity. At 0 o'clock to 3 o'clock, the speed of hygroscopic and condensate water appeared hysteretic effect, and it lagged one hour behind the change in atmospheric humiture. The tendency to go up and down at 4 o'clock to 7 o'clock, and the peak speed of hygroscopic and condensate water appeared at 5 o'clock, the lowest speed of hygroscopic and condensate water appeared at 4 o'clock.
Cheng Long
,
Jia Xiaohong
,
Wu Bo
,
Li Yuanshou
,
Zhao Xuebin
,
Zhou Hong
. Relationship between the Condensation Process of Hygroscopic and Condensate Water and the Air & Soil Humiture in Alpine Sandy Lands[J]. Journal of Desert Research, 2019
, 39(3)
: 77
-86
.
DOI: 10.7522/j.issn.1000-694X.2018.00049
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