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| Effects of different soil porosity on the water conservation of typical vegetation system in western Sichuan |
| WANG Xuan1,2, DU Shuhan3, DENG Limei1,2, ZHU Wanze1, LIU Gangcai1 |
1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Conservancy, 610041, Chengdu, China;
2. University of Chinese Academy of Sciences, 100049, Beijing, China;
3. School of Geographical Sciences, China West Normal University, 637009, Nanchong, Sichuan, China |
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Abstract [Background] Water conservation is one of the important services of the ecosystem, it is closely related to vegetation type and its coverage, litter composition and its quantity, soil layer thickness and soil physical properties, and is a result of the synergistic action of vegetation and soil. But there is no unified standard method to assess its capabilities, and the quantified results of the different methods vary greatly.[Methods] Therefore, taking the Miyaluo forest area of western Sichuan as an example, the total water conservation volume were determined by measuring and calculating the aboveground water retention capacity of typical vegetation and the different porosity constants of its soil. The water conservation capacity of vegetation was determined by water immersion, and the soil porosity constants were determined by soil core samples.[Results] Results showed that the aboveground water conservation capacity of mixed forest was the maximum with the amount of over 100 t/hm2, and then the rank order of the capacity was artificial forest>alpine rhododendron shrub forest>birch forest>coniferous forest>meadow> alpine oak shrub forest > alpine willow shrub forest, which indicates that increasing biodiversity can improve water conservation capacity. The rank order of soil total porosity of different vegetation was coniferous forest> birch forest > meadows > alpine rhododendron shrub forest > artificial forest > alpine willow shrub forest > alpine oak shrub forest > mixed forest. The water conservation capacity within the soils in the study area accounted for more than 90% of the total water conservation capacity, which was consistent with the results of the existing studies. The rank order of soil dehydration rate of different vegetation types was arbor forest> shrub forest> meadows. The difference of soil total porosity was not obvious under different vegetation, but the porosity of capillary and non-capillary were significantly different; the volume of aboveground water conservation of vegetation + water quantity of soil total porosity were not significantly different among various vegetation types, and coniferous and birch forest had the maximum, while mingled forest had the minimum; the volume of aboveground water conservation of vegetation+water quantity of soil non-capillary porosity were significantly different among various vegetation types, and coniferous-forest had the maximum, while meadow had the minimum; but there was opposite trend for the volume of aboveground water conservation of vegetation + water quantity of soil capillary,which was in accord with the results of InVEST model.[Conculsions] The current study suggests that the volume of aboveground water conservation of vegetation in vegetation system + water quantity of its soil capillary porosity is scientific and accurate for assessment the water-holding function of the ecosystem, and improving soil water conservation capacity is the key to enhance the water holding capacity of vegetation system.
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Received: 06 September 2021
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