樱桃圆柏不同种源苗期高生长与物候节律的研究

Study on Height Growth and Phenological Rhythms for Different Provenances of Juniperus monsperma Sarg.

通过对定植于库布齐沙漠东北缘的7个樱桃圆柏种源的苗高生长与物候节律连续3年的观测,结果表明:7个种源的苗期高生长节律差异显著;种源间在春季萌动率、停止生长率和叶变色率等物候期亦存在显著差异;TY7种源萌动期和展叶期最早,展叶最晚的种源为TY4,北部种源(TY6、TY7)比南部种源(TY2、TY4)提早5～10 d展叶。停止生长早晚和种源纬度呈显著负相关,即随纬度增加,停止生长期提前到来;北部种源比南部种源一般提前2～10 d,停止生长率较高的种源为TY1,停止生长较晚的种源为TY4;种源间停止生长期早晚与枯梢率呈正相关,即停止生长越早,种源的枯梢越轻,停止生长期晚则枯梢率高。

Through three -year continuous observation on height growth and phenological rhythms of seven prove- nances of Juniperus monsperma Sarg. planted in northeast edge of Kubuqi Desert, the results show ： there is obvious differences on height growth rhythm, germinating rate in spring, rate of stopping growth and leaf chlorophyll content among seven provenances. TY7 provenance germinates and flushes leaves at the earliest time, with TY4 provenance be the latest one. TY6 and TY7 provenance flushes leaves 5 to 10 days earilier than TY2 and TY4. The time to stop growing has obviouse negative correlation with the latitude of provenances, which the time of stop growing comes earlierly as the increase of latitude. The provenances in the north stop growing 2 to 10 days earlierly than the ones in the south. TY1 provenance has a higher rate of stoping growth, with TY4 be the later one. The time to stop growing has a positive correlation with dieback rate, which the dieback rate of provenance is low if the plant stop growing earlierly, contrarily, it＇s high.