地球自转造成了地表各处昼夜的交替。天文学上把昼半球和夜半球的分界线叫做晨昏线。晨昏线把所经过的纬线圈的昼弧和夜弧的两部分。昼弧和夜弧的长度就决定了一个地方的昼夜长短变化。
Soil temperature was the mainly factor controlling the diurnal variation of soil respiration.
土壤温度成为影响土壤呼吸的昼夜变化主要环境因子。
参考来源 - 东北地区落叶松人工林土壤呼吸的时空异质性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
据卢卡说，海洋是种植植物的好地方，因为水下温度较为稳定，昼夜变化很小。
According to Luca, the sea is a good place to grow plants because underwater temperatures remain stable, changing little from day to night.
这两种装置在阳光充足的气候条件下工作良好；但在北欧，太阳可能一次被云层遮挡数周，而温度不仅随着季节变化，而且还随着昼夜变化。
Both these devices worked well in sunny climates; but in northern Europe, the sun may be hidden by clouds for weeks at a time, while temperatures vary not only seasonally but from day to night.
昼夜变化发生率约50%。
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