不同浓度叶面肥处理对核桃瞬时水分利用效率的影响  

Water Use Efficiency of the Juglans regia Seedlings Treated by Different Levels of Foliar Fertilizer

作　　者：曹晓霞[1] 郭建斌[1] 杨晓菲[1] 秦宁[2] 蒋坤云[1] 李文斌[1] 

机构地区：[1]北京林业大学水土保持学院水土保持与荒漠化防治教育部重点实验室,北京100083 [2]陕西科技大学资源与环境学院,陕西西安712081

出　　处：《西北林学院学报》2011年第3期26-29,共4页Journal of Northwest Forestry University

基　　金：国家"十一五"科技支撑专题"困难立地工程造林新材料;新产品及应用技术"(2006BAD03A0301)

摘　　要：以核桃为试验材料,采用盆栽试验,运用LI-6200便携式光合仪、美制LI-1600稳态气孔计分别测定核桃苗木叶片净光合速率、蒸腾速率等水分生理指标,并计算树种的瞬时水分利用效率。初步分析了不同浓度叶面肥处理下核桃净光合速率、蒸腾速率的日变化以及水分利用效率的变化。结果表明:不同浓度处理下,核桃净光合速率、蒸腾速率日变化均呈"双峰"曲线,净光合速率日变化存在光合"午休"现象。核桃的瞬时水分利用效率在8:00左右最大,18:00达到一天中的最低水平。方差分析表明,叶面肥浓度稀释1 200倍时,核桃的瞬时水分利用效率最大,清水(对照)的瞬时水分利用效率最小。Water physiological indices of potted walnut seedlings with different levels of foliar fertilizer application were measured, such as net photosynthetic rate （Pn） and transpiration rate （Tr）, and instant water use efficiency （WUE1） was further calculated upon the measurement. Diurnal variation curves of Pn and Tr were obtained, and the changes of WUE1 were preliminarily analyzed. The results showed that both diurnal changes of Pn and Tr showed double peak curves in the plants treated by different fertilizer levels. The phenomena of midday depression of photosynthesis was observed in Pn. The value of WUEi was the highest at 8.00 and the lowest at 18 ：00. The analysis of variance showed that WUEi was the highest in the treatment of 1 200 times dilution of the fertilizaer, and lowest in the control （pure water）.

关 键 词：叶面肥 核桃 净光合速率 蒸腾速率 瞬时水分利用效率 

分 类 号：S664.101[农业科学—果树学]