| 引用本文: | 张思毅,李小雁,彭海英,张志华.2012.内蒙古典型草原灌丛和草地斑块土壤水分入渗特征[J].地球环境学报,(6):1117-1125 |
| ZHANG Si-yi,LI Xiao-yan,PENG Hai-ying,ZHANG Zhi-hua.2012.Infiltration pattern beneath shrub canopy and interspace grass patches in typical steppe ecosystems of Inner Mongolia, China[J].Journal of Earth Environment,(6):1117-1125 |
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| DOI：10.7515/JEE201206001 |
| CSTR： |
| 分类号:S152 |
| 基金项目:2012-10-20 |
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| Infiltration pattern beneath shrub canopy and interspace grass patches in typical steppe ecosystems of Inner Mongolia, China |
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ZHANG Si-yi1,2, LI Xiao-yan1,2, PENG Hai-ying2, ZHANG Zhi-hua2
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1.State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China; 2.College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China
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| Abstract: |
| Water is the most critical factor for controlling the vegetation pattern in arid and semiarid regions. Using a dye-tracing experiment, we analyzed the infiltration pattern beneath shrub canopy and interspace grass patches in typical steppe ecosystems. The dye coverage, uniform infiltration depth, maximum infiltration depth, total stained area and heterogeneous infiltration stained area were measured by two indices, the maximum infiltration depth index (MIDI) and heterogeneous infiltration index (HII), which were calculated by processing dye-stained photos. The MIDI and HII of soil under shrubs were 1.41±0.14 and 0.29±0.068, respectively, and larger than those of grass soil, 1.26±0.14 and 0.20±0.076. Using the MIDI, HII, field soil moisture and rainfall data, the infiltration depth and heterogeneous infiltration amount for 26 nature rainfall events were calculated. The results imply that water can infiltrate to a deeper layer beneath shrub canopy than beneath grass patches and that more water infiltration occurs beneath shrub canopy than beneath grass patches. These results are of prime importance for arid and semiarid ecosystems with a limited water supply due to high evaporation and low precipitation. |
| Key words: Infiltration pattern dye-tracing shrub grass patches typical steppe ecosystems |
