摘要
林冠截留直接影响到果树对降雨的有效利用,通过野外测定和统计分析,系统研究了京郊果林杏树(Apri-cot)林冠对降雨的截留特征。观测期间(2008年6-9月),共观测到降雨528.9mm,按以下比例被杏树林冠分配:穿透降雨83.2%,林冠截留16.0%,树干径流0.8%,各分量与林外降雨的回归结果表明:林内穿透降雨量与林外降雨量呈显著的正相关关系;林冠截留量与林外降雨量呈显著的幂函数关系。建立杏树林分的Horton改进模型,结果表明:表征林冠吸附容量的参数Ic*m为2.139mm,表征区域降雨蒸发能力的参数α为6.7%。Horton改进模型较好地解释了林冠截留吸附、湿润与蒸发机理,阶段模拟值和实测值有较好的一致性,显示了Horton改进模型适用于京郊杏树果林冠层截留计算。
Canopy interception affect the fruit trees on the effective use of rainfall directly,the relationships between canopy interception of Apricot forests and rainfall were studied by field survey and statistical analysis.Results show that the total rainfall was 528.9 mm from June to September in 2008.The rainfall was redistributed by the proportion of throughfall 83.2%,interception 16.0% and stemflow 0.8% respectively.The results show that the relationship between throughfall and total rainfal1 is linear and the relationship between throughfall and interception is Logarithm.Using the improved Horton model,in which the parameter Icm means rainfall adsorption capacity of canopy（2.139 mm）and α means coefficient of canopy evaporation for this region（6.7%）.The improved Horton model explain the law of crown interception composed of three physical processes（adsorption,soakage and evaporation）.Simulated values and measured values have a better consistency for a period of time.We conclude that the improved Horton model can be used for estimating canopy water interception in Beijing suburbs Apricot forests.
出处
《水土保持研究》
CSCD
北大核心
2010年第1期183-187,共5页
Research of Soil and Water Conservation
基金
北京市科技计划项目子课题:特色经济作物耗水规律与节水灌溉制度研究(D0706007040191-08)
关键词
京郊杏树果林
林冠截留
Horton改进模型
Beijing suburbs Apricot forests
rainfall interception
the improved Horton model
