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《Journal of Agriculture》 2012-11
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Canopy Water Use Efficiency on a Coarse-Sand-Field,No-Tillage Peach Orchard in North China

Guo Jiaxuan 1,Mei Xurong 2,Ouyang Zhaopeng 1,Li Yuzhong 2 (1 Beijing Key Laboratory for Agricultural Application and New Technique/College of Plant Science and Technology,Beijing University of Agriculture,Beijing 102206,China;2 Institute of Agricultural Environment and Sustainable Development,Chinese Academy of Agricultural Sciences,Beijing 100081,China)  
In order to provide a theoretical basis for developing orchards precision irrigation management,water vapor exchange and water use efficiency were monitored by an eddy covariance technique on an untilled 12-year-old peach orchard.The results showed that:a daily-average amount of evapotranspiration and WUE during monitoring stages were (2.3±2.1) mm/d and 1.26 g (CO2)/[kg (H2O)],respectively.The daily changes of WUE at canopy level were strongly influenced by ' vapor pressure difference ' during the plant rapid growth stages.A from-high-to-low order of orchard-tree WUE followed the stages:post fruit harvest periodlate fruit enlargement period and ripening periodflowering period and early fruit enlargement period.The trends of water evapotranspiration and WUE both had one peak.At the late period of fruit enlargement,the evapotranspiration was extremely high and reached its daily maximum value at 7.1 mm/d.Average daily WUE reached a peak of 2.1 g (CO2)/[kg (H2O)] after fruit harvest.The annually-cumulative evapotranspiration was up to 790.6 mm,and the annual average peach tree coefficient reached 1.08,which was higher 27% than that of FAO given.The results showed that the evapotranspiration at the peach-orchard-canopy level increased significantly under semiarid and sub-humid climate,and the key stage of water requirements on peach orchard was followed form late fruit enlargement period to fruit ripening period.
【Fund】: 国家自然科学基金项目“定量评价气孔调节大田作物的节水潜力”(31040006);; 国家科技支撑项目“重大农业气象灾害防控与管理技术研究与示范”、“北方速生丰产林与果园生态系统固碳增汇技术研究与示范”(2011BAD32B03、2008BAD95B07);; 北京市教育委员会科研水平提高经费(5076016010)
【CateGory Index】: S662.1
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