冬小麦冠层阻力日变化的估算  

Estimating Diurnal Variation of Winter Wheat Canopy Resistance at Different Growth Stages

作　　者：胡继超[1] 张佳宝[1] 赵炳梓[1] 朱安宁[1] 

机构地区：[1]中国科学院封丘农业生态国家实验站

出　　处：《灌溉排水学报》2005年第2期1-4,共4页Journal of Irrigation and Drainage

基　　金：国家高技术研究发展计划"863"项目(2003AA209010);中国科学院野外台站基金资助项目

摘　　要：根据田间试验观测资料,利用3种作物冠层阻力估算方法推算了冬小麦在拔节、抽穗、灌浆3个生育时期在典型晴天、土壤水分充分供应状况下冠层阻力的日变化。3种作物冠层阻力估算方法为利用波文比能量平衡法使用Penman-Monteith公式反推(rc-BREB)、利用冠层温度和蒸散量推算(rc-Tc)、利用不同部位单叶气孔阻力和有效叶面积指数合成法推算(rc-LAI)。结果表明,3种作物冠层阻力估算方法均推得的冠层阻力日变化趋势相同,但冠层阻力值大小存在差异。冬小麦冠层阻力在08:00～15:00时变化平稳,15:00以后开始升高,日落前后升高最为剧烈。采用冠层温度推算的冠层阻力rc-Tc比rc-BREB偏低,rc-LAI在灌浆后期和15:00后比rc-BREB偏高,且没有rc-BREB变化平稳。Based on the field measurements under clear sky and well-watered condition at jointing, heading and grain-filling stages of winter wheat in 2004, diurnal canopy resistances were estimated with three different methods (obtaining by inversion of the Penman-Monteith equation with Bowen ratio(r_(c-BREB)), calculating with canopy temperature and LE(r_(c-Tc)), scaling up from single leaf stoma resistance (r_(c-LAI)). The results showed that diurnal canopy resistances stay relatively constant during 08:00~15:00, then increase gradually after 15:00 and sharply around sunset. r_(c-Tc) is lower than r_(c-BREB) at three stages, but r_(c-LAI) is higher than r_(c-BREB) at grain filling stage and after 15:00 at jointing and heading stages.

关 键 词：冬小麦 日变化 估算方法 作物冠层 Penman 冠层温度 能量平衡法 叶面积指数 观测资料 田间试验 生育时期 气孔阻力 不同部位 变化趋势 推算 h公式 波文比 蒸散量 合成法 灌浆 平稳 拔节 抽穗 水分 土壤 

分 类 号：S512.11[农业科学—作物学] P402[天文地球—大气物理学与大气环境]