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以呼和浩特市较常用的紫丁香等13种园林树种为材料,通过分析不同PV曲线水分参数的差异,使用系统聚类方法对试验树种进行耐旱性综合评价,得出以下结论:1)通过对13种树种的PV曲线水分参数的分析,得到的耐旱性排序存在显著差异,同一参数在不同月份所得到的耐旱性排序也不相同。2)PV曲线水分参数存在时间和树种的差异性,所以各个指标进行综合评价可以消除该差异性。3)综合考虑各PV曲线水分参数,试验树种的耐旱性由强到弱的顺序是:油松>圆柏>互叶醉鱼草>侧柏>锦带花>华北珍珠梅>火炬树>国槐>山桃>桃叶卫矛>紫丁香>柽柳>山杏。
Thirteen kinds of garden tree species such as lilac commonly used in Hohhot city were used as materials to analyze the differences of water content parameters of different PV curves. The systematic clustering method was used to evaluate the drought tolerance of the tested species. The conclusions were as follows: 1) The analysis of the PV curve moisture parameters of 13 tree species showed significant differences in the order of drought tolerance, and the order of drought tolerance obtained by the same parameter in different months was also different. 2) There is difference in the time and tree species of PV curve moisture parameters, so the comprehensive evaluation of each index can eliminate the difference. 3) Considering the moisture parameters of each PV curve, the order of drought resistance of tested species from strong to weak is: Pinus tabulaeformis> Sabina przewalskii> Platycladus orientalis> Platycladus orientalis> Jinbaihua> Pear in North China> Rhus typhina Sophora japonica> peach> peach leaf spear> lilac> Tamarisk> apricot.