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用线性差分径向变化仪连续监测充分灌溉条件下的仕女红桃树茎直径变化,结合同步观测的气象因子数据,分析2007年3月中旬～10月下旬的仕女红桃树茎直径变化规律,为基于果树直径变化的灌溉管理提供基础依据。结果表明:仕女红桃树茎直径具有很好的时间变化规律,日变化曲线呈均匀“U”型,日最大值出现在黎明前后,日最小值出现在下午4时左右;季节变化方面,MDS呈低—高—低变化规律,从萌芽—开花期到果实成熟期的不同生长阶段,MDS平均值依次为87μm、200.84μm、253.75μm、171.67μm、138.67μm和94.34μm,坐果—展叶期和第一次果实膨大期MDS值居全生育期最高,需水量最大。桃树直径生长呈慢—快—慢变化规律,3月中下旬,开始生长,平均日生长量从12.68μm逐渐增加大36.84μm,7月24日～8月23日之间生长最快,平均日生长量达73.67μm,然后迅速下降,到生长末期平均日生长量仅为7.36μm。3～5月和7～9月可分别采用DI和MDS作为灌溉控制指标。茎直径变化与气象因子响应强烈,但不同生长阶段对茎直径变化产生主要影响的气象因子不同,对MDS产生主要影响的气象因子依次为:Rn、Tmax、Tmax、Tmax、RH和Rn,对SCG产生主要影响的气象因子依次为:Tmax、Ta、Tmin、RH、Ta和Ta。全生育期内温度是对直径变化产生影响的最主要气象因子,太阳辐射在全生育期内均与MDS有显著相关性。
The change of stem diameter of Ladys beauty under continuous irrigation was monitored by linear differential radial variation instrument. The changes of stem diameter of Ladys rose were observed from mid-March to late October 2007 with the simultaneous observation of meteorological data. It provides the basis for irrigation management based on the change of fruit tree diameter. The results showed that the stem diameter of Ladys tree had a good time variation, the diurnal variation curve was uniform “U” type, the daily maximum appeared before and after dawn, the daily minimum appeared around 4:00 pm; the seasonal variation , MDS showed a low-high-low variety. The mean value of MDS was 87μm, 200.84μm, 253.75μm, 171.67μm, 138.67μm and 94.34μm in different growth stages from germinating-flowering stage to ripening stage. The MDS value of the leaf stage and the first fruit enlargement period was highest in the whole growth period and the water demand was the largest. The diameter growth of peach trees showed a slow-fast-slow change, and began to grow in the middle and late March. The average daily growth gradually increased from 12.68μm to 36.84μm, with the fastest growth from July 24 to August 23, with an average of The daily growth of 73.67μm, and then rapidly decreased to the end of the growth average daily growth was only 7.36μm. From March to May and from July to September, DI and MDS were used as irrigation control indexes respectively. The changes of stem diameter responded strongly to meteorological factors, but the meteorological factors that had the main effect on the changes of stem diameter at different growth stages were different. The meteorological factors that had the main influence on MDS were Rn, Tmax, Tmax, Tmax, RH and Rn. The meteorological factors that have the main influence are Tmax, Ta, Tmin, RH, Ta and Ta. During the whole growth period, the temperature was the most important meteorological factor that affected the diameter change. The solar radiation had a significant correlation with MDS during the whole growth period.