[1]XIONG Xiaofeng,LI Jianhong,PU Junbing,et al.Dynamics Rules and Coupling Transfer Characteristics of Soil Moisture and Temperature on Soil Profile in Typical Karst Rocky Desertification Area[J].Research of Soil and Water Conservation,2020,27(05):59-66,71.
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Dynamics Rules and Coupling Transfer Characteristics of Soil Moisture and Temperature on Soil Profile in Typical Karst Rocky Desertification Area
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 05
Page number:
59-66,71
Column:
目次
Public date:
2020-08-20
- Title:
- Dynamics Rules and Coupling Transfer Characteristics of Soil Moisture and Temperature on Soil Profile in Typical Karst Rocky Desertification Area
- Keywords:
- plateau rocky desertification; soil water content; soil temperature; coupling characteristics
- CLC:
- S152.7
- DOI:
- -
- Abstract:
- The field monitoring and related researches on soil water content(SWC)and soil temperature(ST)in rocky desertification areas with bare rock are in deficiency. We select the typical plateau rocky desertification area in the karst fault basin of Mengzi City, Yunnan Province, and monitored the meteorological elements and SWC and ST continuously at depths of 10 cm, 40 cm and 80 cm for a whole year. We analyzed the data by combining multivariate statistics and hydrothermal transmission theory. The results show that:(1)once the rain stops, the SWC quickly decays to the initial state, resulting in alternation of wetting and drying continually in the shallow soil; the concentrated rainfall is beneficial to the deep soil water supply in the area; the shallow ST is affected by meteorological factors and has frequent fluctuation;(2)the influencing factors of SWC and ST are analyzed based on redundancy analysis( RDA ); the main factors affecting SWC are rainfall, daily cumulative radiation, air temperature and evapotranspiration; the main factor affecting ST is just the air temperature; the overall interpretation rate of rainfall for SWC is 39.5%, and the overall interpretation rate of temperature for ST is 77.4%;(3)the soil heat conduction in near the surface is more obvious, and heat storage in near the surface is weaker; the soil in 0—40 cm layer is basically a downward heat transfer layer, while soil in the 40—80 cm layer mainly stores heat or transfers heat up. Soil vapor water stores in the summer and autumn, and soil vapor water releases in the spring and winter. The vapor flux curve and the heat flux curve have the synchronous trend, indicating that soil temperature is the main controlling factor on vapor migration. Heat and vapor stored in the soil can support vegetation restoration in rocky desertification areas.
- References:
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Last Update:
2020-08-25