| Effect of millet and winter wheat planting on the redistribution of rainfall under simulated rainfall conditions |
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| DOI：10.7606/j.issn.1000-7601.2014.06.035 |
| Key Words: crops rainfall redistribution influencing factors of rainfall reallocation through fall stem flow canopy interception |
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| Abstract: |
| Effect of crop canopies on the reallocation of rainfall plays an important role in exploring the influence of crops on the formation and development of soil erosion in sloping fields, which has important significance for revealing the mechanism of crops affecting soil erosion as well as using agricultural water reasonably and effectively. The study aims to determine the through fall of two crops, millet and winter wheat, during different growth periods under different rainfall intensity. Based on the rainfall simulation experiment, canopy interception in different growth periods was determined with the artificial spray method, and stem flow was calculated by water balance. The results showed that rainfall reallocation was significantly affected by canopies of millet, with the mean through fall rate of 79%, the mean stem flow rate 20%, and the mean canopy interception rate 1%. Winter wheat showed the similar trend, with the mean through fall rate being 79%, the mean stem flow rate 19%, and the mean canopy interception rate being 2%. For the whole growth period, there was a opposite trend between the through fall and flow of stem of two crops under canopies. There was a significant positive correlation between through fall capacity or stem flow capacity and rainfall intensity, but there was no significant correlation between through fall rate or stem flow rate and the rainfall intensity. There was a positive correlation among stem flow and canopy interception as well as the proportion of both in the total rainfall capacity, but through fall capacity and through fall rate both decreased with the leaf area index increased. This finding could lay the foundation of improving water use efficiency and reducing soil erosion. |
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