管胞长度的种源区和产地效应很小，无一定的地理变异趋势。
There were very small effect of seed source and no definite geographic pattern in tracheid length.
利用各种源的生长性状、保存率与各种源的地理气候因子做聚类分析，进行种源区划，初步划分为10个种源区。
By clustering analysis to growth, survival rate, geographic and climate factors among provenances, 10 provenance zones were divided.
提出了一种新型的低电压、低功耗、工作在亚阈值区的基准电压源。
A new low-voltage low-power CMOS voltage reference operating in subthreshold region is presented.
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