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中文摘要：
采用美国生产的DeTransfer3．27茎流测定系统监测一年生的桃树幼苗树干液流变化。分析了不同水分、氮肥处理下桃树苗树干液流日变化和连E1变化特征及茎流与蒸腾的变化关系。结果表明，桃树苗茎液流速率存在明显的日周期和连日变化规律。水分对桃树苗茎流的影响：在相同的氮素水平下茎液流速随土壤水分含量的增加依次增加，无氮处理下，茎液流流速在充分灌水条件下最大峰值为11g／h左右，较低水条件下增加了15．8％，高氮处理下，茎液流流速最大峰值为23．5g／h左右。氮肥对桃树苗茎流的影响：施氮肥明显地增加桃树苗茎液流速，在土壤水分供应充足条件下。茎液流流速分别为N1 11g／h、N2 16．5g／h、N3 23．5g／h；茎液流速和蒸腾速率动态曲线有着相似的变化趋势。
英文摘要：
In this paper, the DeTransfer 3. 27 sap flow measuring system is adopted to measure the variation of sap flow of one-year -old peach seedling. The daily and continuous variation characteristic and the relationship between transpiration rate and sap flow under different water and nitrogen treatment are analyzed. The result shows that the diurnal sap flow velocity of Peach seedling has obvious daily and continuous variation law. Under the same nitrogen treatment, sap flow velocity increases with the increase of soil water content. For no nitrogen treatment, the maximum peak of sap flow velocity reaches about 11 g/h under sufficient irrigation, which increases 15. 8% than insufficient irrigation. The maximum peak of sap flow velocity reaches about 23.5 g/h under high nitrogen treatment. The sap flow velocity increases with the increase of nitrogen fertilizer. There is a similar variation trend between sap flow and transpiration rate.
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