冬季桃树生理生态指标变化规律研究

Variation Law of Physiological Ecology Index of the Peach in Winter

在分析空气温度、土壤水势以及土壤温度生态因子变化的基础上，研究了桃树茎干日变化规律以及冬季桃树的茎干变化。得出冬季土壤水势随时间逐渐减小，并受土壤温度变化影响。分析了冬季桃树地5、15和30cm深度的土壤温度变化规律，并对曲线进行拟合，发现冬季土壤温度以二次函数规律变化，并且相关系数都在0．9以上。桃树茎干有明显的日变化规律，日最大收缩量受土壤水分状况影响较大，土壤水势高的处理，桃树茎干日最大收缩量大，相反水势较低的最大日收缩量变化较小。在2006年11月～2007年1月桃树茎干随时间不断收缩，但是收缩幅度与土壤水势有关，土壤水势高的收缩幅度较小，水势低的，收缩幅度较大。

The peach winter irrigation has a direct influence on the peach growth and production next year. So we will seek a goal that is an index for making decision irrigation the peach in winter. Based on the analysis of change of soil water potential （SWP） and soil temperature （ST）, we researched the daily trunk diameter variation （DTDV） and trunk diameter variation （TDV） of peach in winter. Drawing a conclusion is the SWP gradually decreasing with the time and affected by changing of soil temperature. We analyzed change law of ST below 5 cm, 15 cm and 30 cm in winter and got a conclusion that the change of soil temperature is quite the Quadratic Function and the correlation coefficient is all above 0.9. The law of change of the trunk of peach is very obvious. SWP will affect maximum daily shrinkage （MDS） of the trunk diameter of peach. SWP is high then MDS is high and vice versa. The trunk diameter of peach has diminished gradually from November 2006 to January 2007. The shrinkage of trunk diameter （STD） of peach is related to SWP, SWP is high then STD is less and vice versa.