中国农业科学Issue(8)：1541-1549,9.
自然降雨条件下夏玉米冠层截留特征及影响因素
Canopy Interception of Summer Corn and Its Influencing Factors Under Natural Rainfall
摘要
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.关键词
自然降雨/夏玉米/冠层截留/茎秆流/叶面积指数Key words
rainfall/summer corn/canopy interception/stemflow/leaf area index引用本文复制引用
韩雪,王力,王艳萍..自然降雨条件下夏玉米冠层截留特征及影响因素[J].中国农业科学,2014,(8):1541-1549,9.基金项目
国家自然科学基金项目 （）
