青藏高原的夜间低温对麦苗和牧草的生理意义

THE PHYSIOLOGICAL SIGNIFICANCE OF NIGHT TEMPERATURE ON SOME WHEAT SEEDLING AND HERBAGE IN OINGHAI-XIZANG PLATEAU

本文模拟了青藏高原地区日/夜温度为20—24℃/7—10℃,日较差10—17℃左右的典型气候条件下,夜低温对几种麦苗和牧草的一些生理效应。试验结果指出:夜低温可以提高麦苗和牧草苗的叶绿素含量及叶绿素的b值,有利于根系活力的增强和干物质的积累,并导致叶片过氧化物酶活性升高,新同工酶谱带产生,特别对糖分积累的影响尤其显著。由此论证了青藏高原上生长季节里的夜间低温有利于作物和牧草的生长,指出了青藏高原地区的一些农作物屡创高产,牧草营养丰富的重要气象原因。

This paper simulates some physiological characteristic of some wheat seedling and herbage, the plants were grown under 20-24℃ of day temperature and 7-10℃ of night temperature and 10-17℃ of daily range. Influences of night temperature on certain physiological effects of some wheat seedling and herbage were dealt with at seedling stage in Qinghai-Xizang plateau. The experimental results showed that low night temperature increased contents of total chlorophyll and chlorophyll b, be advantageous to enhancement of vitality of roots, and accumulations of a large number dry materials, increased activity of peroxidase, changed the isozymes pattern, produced much greater band. low night temperature is obvious on accumulation of carbohydrate especially. Thus it demonstrated that low night temperature during growing season in Qinghai-Xizang plateau area is very much benefit crops and herbages, and pointed out the main meteorological factors such as the continuous high-yield in several crops, better quality of the herbage in the area of Qinghai-Xiang plateau.