以民勤荒漠区1974年以来的36种植物的物候观测资料,运用物候频数的统计方法,划分5个物候相,分析物候相的持续特征和组合特征.结果表明:植物的活动期物候相持续日数平均为212天,绿色期物候相持续日数较长,花色期物候相持续日数最短;花色期、挂果期和绿色期3个物候相不同植物之间相互重叠;旱柳的活动期物候相最长,火炬树和芦苇的活动期物候相最短,胡杨和火炬树的绿色期物候相最短,芦苇的秋色期物候相最短;荒漠区不同植物的花色期以及挂果期差异很大.在花色期物候相中,开花始期较早的植物开花末期也相对较早.%Phenophase of plants is crucial to forecast a variety of seasonal weather events (such as dust storms, strong winds) , and determine seasonal grazing and the building of sand-fixing vegetation in the desert region. Five Phenophases were divided based on observed phenology data of 36 plant species since 1974 in Minqin desert region with frequency statistical method of phenology. Sustained characteristics and combination characteristics of the phenophases were analyzed. The results showed that; Phenophase of plant active period was 212 days. The continuous green period was even longer, and the continuous flower color period was shortest. Flower color period, fruit bearing period and green period overlapped between the different plants. Salix matsudana had the longest active period, while Rhus typhina and Phragmites communis had the shortest active period. Populus euphratiea and Rhus typhina had the shortest green period, and Phragmites communis had the shortest autumn color period. The plants in the desert exhibited huge differences in glorescence and fruit period. The plants started flowering early, and also stopped flowering early in terms of the phenophase on flower color period.
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