高粱、谷子根系发育及其抗旱性研究

Study on root system development and drought resistance of sorghum and millet.

试验结果显示,干旱条件下高粱、谷子根系发育显著增强,平均单位地上部分干物质量所具有的根长分别达到8m/g和11m/g,对0～100cm土层土壤水的利用能力可达到凋萎湿度。谷子、高粱主要生理指标光合速率、气孔阻力和叶水势对土壤水分降低的反应并不明显,尤其是高粱,在所试根层土壤水分范围内(14％～30％体积土壤含水量)这些生理指标基本维持恒定,具有较强的耐旱性和抗旱性。

A experiment was made to study root system development and drought resistance of sorghum and millet. The results showed that root system of sorghum and millet was enhanced evidently under drought conditions. The average root length of dry biomass of sorghum on the ground was 8m/g,and that of millet was llm/g. Their ability to utilize soil water in the depth of 0- 100cm was significant,near the wilting point. Such main physiology indexes as photosynthetic rate, stomatal resistance and leaf moisture potential did not act obviously to the decreasing soil moisture. The indexes of sorghum could even keep stable in its experiment moisture range (14% -30% of soil volumetric water content) ,so sorghum has more drought tolerance and resistance than millet.