Scientia Agricultura Sinica ›› 2014, Vol. 47 ›› Issue (8): 1541-1549.doi: 10.3864/j.issn.0578-1752.2014.08.010

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Canopy Interception of Summer Corn and Its Influencing Factors Under Natural Rainfall

 HAN  Xue-1, 2 , WANG  Li-1, 2 , WANG  Yan-Ping-1   

  1. 1、College of Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi;
    2、State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, Shaanxi
  • Received:2013-11-28 Online:2014-04-15 Published:2014-02-28

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Abstract: 【Objective】 Canopy interception is commonly considered to be the frontier and hot issue of ecological hydrology. In this study, the characteristics of corn canopy interception and its influencing factors were explored. The purpose was to evaluate the water efficiency of natural rainfall of summer corn much reasonably, provide a theoretical basis for scientific planting, improve agricultural crop production, and prevent farmland from soil erosion in the dry farming region.【Method】The method of water balance was used to measure the canopy interception, throughfall, and stemflow of summer corn. Throughfall was collected by rain gauges. Stemflow was assembled by collection tube at the bottom of stem. A transfer hose was connected with stemflow collection tube to drain the water to the plastic drum, and then collect the stemflow until it can be measured. Total rainfall was observed by automatic weather station in real time and corrected by artificial observation.【Result】Under different rainfall levels (0.1-4.9 mm, 5.0-14.9 mm, 15.0-29.9 mm), the canopy interceptions were 1.1 mm, 2.6 mm and 13.0 mm, and the average of canopy interception was 1.7 mm. The canopy interception rates were 12.3%, 12.1%, 15.3%, and the average of canopy interception rate was 13.3%. A linear regression model was developed to express the relationship of canopy interception rate with leaf area index and plant height. A power function between canopy interception and vapor pressure deficit and rainfall duration was founded. An exponential function between canopy interception and the rainfall amount was developed. Finally, a regression model was considered to express the relationship between corn canopy interception and possible influencing factors (R2=0.946). 【Conclusion】 Under natural rainfall, the summer corn canopy interception was not to be neglected, and it was influenced by many factors. In this study, summer corn canopy interception was impacted by planting density, corn morphological index (height, leaf area) and meteorological factors (such as rainfall, wind speed, vapor pressure deficit, and rainfall duration). Establishing a regression model of canopy interception with a variety of factors can provide a theoretical basis for scientific planting and improve the agricultural water use efficiency in the dry farming region.

Key words: rainfall , summer corn , canopy interception , stemflow , leaf area index

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