摘要
在田间条件下研究了温度、相对湿度、土壤水分对玉米、高粱、茄子、豇豆、河北杨和泡桐六种植物LER和功ψ_(WL)日变化的影响。结果表明。ψ_(WL)日变化呈正弦曲线,即早晨、晚上高,中午低;土壤水分亏缺,中午大气ψ_(WV)愈低,ψ_(WL)降低愈多。在土壤供水良好的条件下,玉米、高粱、河北杨、泡桐叶片生长与温度密切相关,因此白天生长快,晚上生长慢;若中午ψ_(WV)太低,生长减慢,使叶片生长呈双峰曲线,即午前及18:00左右生长快。若土壤水分亏缺,白天ψ_(WV)太低,白天生长慢,晚上生长快。茄子和豉豆叶片生长对水分亏缺更敏感,晚上生长快,白天生长慢,干旱处理叶片在白天中午有收缩现象。
The daily cycle of Ψ_(WL) and LER of corn, sorghum, eggplant, cowpea,poplar and paulownia, as well as air temperature, relative. humidity andsoil water content, are monitored in the field. The results from experi-ments show that ψ_(WL) of expanding leaf exhibits a sinusoidal curve withtime, with minimum value around 1300-1500 and maximum value beforedawn. The lower the soil water content and the lower Ψ_(WL) at noon are,the lower the ψ_(WL) will be. There are close relations between temperature and LER of corn, so-rghum, poplar and paulownia under well-watering. When temperature islimited, LER is rapid at daytime and slow at night. When ψ_(WL) is verylow at noon, the LER of plant leaves exhibits two peaks, one in the fo-renoon and the other late in the afternoon.When the soil water contentis limited, greater growth of plants occurs at night. Leaf growth of eggplant and cowpea is very sensitive to water defi-cit, so greater growth of them takes place at night. Leaves shrink atnoon under soil water deficit for the drying process.
基金
国家自然科学基金资助的一部分
关键词
叶片延伸速率
温度
水分状况
水势
Temperature
Water status
Water potential
Leaf Elongation Rate (LER)
