影响管胞形态地理变异的气候因子中，水湿条件是主导因素，其次是温度。
Among the climatic factors which affect the geographic variation of tracheid morphological, moisture and rainfall are the principal factors, secondary is temperature.
方法结合地理距离和遗传距离的关系，分别建立基于三种经典遗传距离的群体遗传空间结构异质性的变异函数模型。
Methods Spatial semivariogram models were set up based on genetic distance by analyzing the relationship between geographic distance and genetic distance.
人们认为这种梯度变异可能是降水量，温度也许还有光周期等地理趋势造成的结果。
The cline is considered the probable result of geographic trends in precipitation, temperature, and perhaps also photoperiod.
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