起苗时间对杜梨生长的影响

Influence of the Digging Time of the Saplings on the Growth of Pyrus betulaefolia,Bge

对定植的杜梨 (PyrusbetulaefoliaBge .)苗进行了假植苗和随栽随起苗的成活率、新梢生长量、叶片生长状况和蒸腾速率、气孔阻抗、叶温、叶温与气温差日变化的测定。结果表明 ,随栽随起苗的成活率和生长状况与各项生理指标均好于假植苗。揭示了影响树木生长的水分生理状况和过程。提出了生产中要提倡采用随栽随起苗 ,或应尽量接近随栽随起的时间。

Daxi Village in Yuli County, Xinjiang, is selected as the experimental area for this study. It is located on an alluvial-diluvial plain; the soil is forest meadow soil. The annual precipitation here is 34 mm, and the annual evaporation varies in a range of 2 429～2 910 mm. The monthly temperatures in January and July are -10 ℃ and 26 ℃ respectively, and the accumulated temperature ≥10 ℃ varies in a range of 4 161～4 242 ℃. The frost-free period is 184 days. The annual sunshine duration and the sunshine duration in the period of crop growth from April to October are 2 963～3 130 hours and 1 911～2 055 hours respectively. Therefore, the climate conditions are suitable for growing sun crops and advantageous for sugar accumulation in fruits. In this paper, the survival rate of the Pyrus betulaefolia, Bge. heeled and of that planted as it dug out, growth of new leaves, growing status of leaves, transpiration, leaf temperature, and daily change of the temperature difference between leaves and air, are measured. The results show that the survival rate and growing status of Pyrus betulaefolia, Bge. planted as it dug out is higher than that heeled.