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生长在四季分明地区的作物,在炎热夏天不同程度地存在“午休现象”。青海地处高原,作物生长季节短,但日照时间长,昼夜温差大。为进一步探讨青海作物高产的生理原因,从1980—1982年分别在西宁和香日德两地对春小麦、油菜、蚕豆等作物进行试验,测定作物叶片气孔的开关规律及蒸腾强度日变化。证明在青海高原尤其是柴达木盆地高产区,作物不存在“午休现象”或“午休”不明显,表明在光强的午间,能照常进行光合作用。按日比内地作物进行光合作用的时间多1—3小时。青海高寒地区作物在生育期中气孔开关日变化基本呈抛物线,与四季分明地区的作物气孔开关日变化呈双峰曲线显然不同。
Crops grown in areas with distinct seasons have “noon breaks” to varying extents in the hot summer months. Qinghai is located in the plateau, crop growth season is short, but long sunshine, large temperature difference between day and night. In order to further explore the physiological causes of crop yield in Qinghai, the spring wheat, rapeseed, broad bean and other crops were tested in both Xining and Xiangride respectively from 1980 to 1982 to determine the leaf stomatal switching and diurnal variation of transpiration intensity. It is proved that there is no obvious “noon break” or “lunch break” in the high yielding areas of Qinghai Plateau, especially Qaidam Basin, indicating that photosynthesis can be carried out as usual during the midday of light intensity. Photosynthesis takes 1-3 hours more than cropland on a daily basis. The daily change of stomatal switch in the alpine region of Qinghai is basically a parabola, which is obviously different from the diurnal variation of stomatal switch in the four seasons.