| Mechanism of high\|efficient water use of intercropping in arid regions |
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| DOI：10.7606/j.issn.1000-7601.2023.03.09 |
| Key Words: intercropping high\|efficient water use niche differentiation water redistribution arid region |
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| Abstract: |
| Crop intercropping system has been widely used in arid areas due to high grain yield and efficient use of resources such as light, radiation, water, and nutrient. The mechanism of water use advantage in intercropping system was discussed based on the previous research about water use of intercropping. The results showed that intercropping reduce soil evaporation and the ratio of evaporation and evapotranspiration, increased the availability of soil water, improved crop transpiration and the absorption and utilization of soil water by crop roots and then improve water use efficiency. The water use mechanism of intercropping system including niche differentiation reduced competition and promoted the full use of resources and water redistribution regulated the soil water content of crop and adjacent crop to alleviates the water stress of crops in arid areas. The major regulation factors for efficient water use in intercropping included crop species, sowing density and spatial arrangement, water and fertilization management, and tillage measures. Further studies about water efficient use in intercropping system include the mechanism of yield increase and water saving of intercropping in different regions; the relationship between water and source\|sink and response to interspecific relationship; quantization the relationship between water and root growth to establish a model on water absorption by intercropping crops and response of underground to water use advantage in intercrops. |
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