| Cite this article: | 景建生,刘子琦,李渊,等.石漠化治理区不同植被类型浅层土壤水分对降雨的响应[J].灌溉排水学报,2020,(3):-. |
| JING Jian-sheng,LIU Zi-qi,LI Yuan,et al.石漠化治理区不同植被类型浅层土壤水分对降雨的响应[J].灌溉排水学报,2020,(3):-. |
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| Response of shallow soil moisture to rainfall of different vegetation types in rocky desertification control areas |
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JING Jian-sheng, LIU Zi-qi, LI Yuan, WANG Jin, LUO Ding, CAI Lu-lu
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School of Karst Science , Guizhou Normal University
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| Abstract: |
| Abstract:【Objective】The unique geomorphologic features, complex hydrologic process and special vegetation site conditions in karst rocky desertification control areas make the soil water infiltration process and plant growth environment different from that in non-karst areas. As an important water source of plant life activities, shallow soil moisture has a certain response relationship with rainfall. It is of great practical significance to study the recharge characteristics of rainfall to shallow soil moisture of different vegetation types. Therefore, the purpose of this paper was to reveal the difference of shallow soil moisture infiltration process among different vegetation types in rocky desertification control areas, analyze the characteristics of rainfall replenishment to soil moisture, and carry out the irrigation work according to local conditions.【Method】Zanthoxylum bungeanum land, Lonicera japonica land, Hylocereus undulatus land and wasteland were studied. The rainfall and the soil moisture content of different soil layers (0～10 cm and 10～25 cm) in the areas were monitored, and the soil moisture storage, lag time, effective recharge rate and effective recharge efficiency were calculated.【Results】①The change trend of shallow soil moisture content among four different vegetation types was consistent with rainfall, and June、August and September were the peak periods of the changing. The content of shallow soil moisture from more to less in proper order are: Hylocereus undulatus land, wasteland, Lonicera japonica land, Zanthoxylum bungeanum land; The variation coefficient of soil moisture content of Hylocereus undulatus land was the smallest, and wasteland was the largest. ②The response of soil moisture content to the sprinkle was not obvious, only the Hylocereus undulatus land increased by 11.97%; With the increase of rainfall level, the changes of soil moisture content of Hylocereus undulatus land ranged from 7.89% to 17.94%, followed by Lonicera japonica land (0～45.09%), wasteland (0～59.86%), and Zanthoxylum bungeanum land (0～126.95%). The growth rate of shallow soil moisture content of Hylocereus undulatus land was the smallest in heavy rain event, while the growth rate of other three plots was small in light rain and large in torrential rain. ③The response of shallow soil moisture of this four vegetation types to rainfall was significantly different. Under the condition of heavy rainfall, the response time was faster than that of small and medium rainfall, and the layer 0～10 cm was better than that of 10～25 cm. The average lag time of wasteland was 0.3 h, Hylocereus undulatus land was 0.5 h, Zanthoxylum bungeanum land was 0.9 h, and Lonicera japonica land was 3.0 h. The order of effective recharge efficiency was Hylocereus undulatus land (64.87%)> wasteland (38.16%)>Zanthoxylum bungeanum land (31.94%)>Lonicera japonica land (29.23%).【Conclusion】For Hylocereus undulatus land, reducing artificial irrigation and increasing land cover in wet season can reduce soil erosion. For Lonicera japonica land and Zanthoxylum bungeanum land, the corresponding keep moisture measures should be taken to improve the utilization efficiency of rainfall, and irrigation and infiltration should be increased when the rainfall is deficient. |
| Key words: rocky desertification; vegetation types; soil moisture; rainfall |
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