| 雨养玉米农田生态系统的蒸散特征及其作物系数 |
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| 引用本文： | 王宇,周广胜.雨养玉米农田生态系统的蒸散特征及其作物系数[J].应用生态学报,2010,21(3):647-653. |
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| 作者姓名： | 王宇 周广胜 |
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| 作者单位： | 1.中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093;2.中国科学院研究生院, 北京 100049;3.中国气象科学研究院, 北京 100081 |
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| 基金项目： | 科技部科研项目，国家杰出青年科学基金 |
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| 摘 要： | 基于雨养玉米农田生态系统2007年整个生长季的涡度相关通量资料，对蒸散的日、季动态进行分析.结果表明：玉米农田生态系统蒸散的日、季动态均呈单峰型变化，最大值分别出现在12:00左右和7月.结合修正的Penman-Monteith公式与相应的生态、气象观测要素，对作物系数(K指数)影响因子的分析结果表明，K指数主要受叶面积指数(LAI)、气温(Ta)、净辐射(Rn)以及表层土壤含水量的影响.在此基础上，初步建立了半小时尺度的作物系数(K指数)模型.
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| 关 键 词： | 玉米农田生态系统 实际蒸散 作物系数 叶面积指数 冷浸田 水旱轮作 光合特性 土壤团聚体 土体构型 经济效益 |
Evapotranspiration characteristics and crop coefficient of rain-fed maize agroecosystem |
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| WANG Yu,ZHOU Guang-sheng.Evapotranspiration characteristics and crop coefficient of rain-fed maize agroecosystem[J].Chinese Journal of Applied Ecology,2010,21(3):647-653. |
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| Authors: | WANG Yu ZHOU Guang-sheng |
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| Institution: | 1.State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China;3.Chinese Academy of Meteorological Sciences, Beijing 100081, China |
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| Abstract: | Based on the eddy covariance flux data, meteorological gradient data, and ecological observation data, an analysis was made on the diurnal and seasonal dynamics of evapotranspiration from a rain-fed maize agroecosystem in the growth season of 2007. The diurnal and seasonal dynamics of the evapotranspiration could be both expressed as parabola curve, with the peak values appeared at about 12:00 and July, respectively. The crop coefficient of the agroecosystem was mainly affected by leaf area index (LAI), air temperature, net radiation, and surface soil moisture content. A statistical model of crop coefficient on half-hour scale was constructed. |
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| Keywords: | maize agroecosystem actual evapotranspiration crop coefficient leaf area index (LAI) |
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