不同供水负压对小白菜生长及主要生理指标的影响

Influence of Different Water Supply Negative Pressure on Growth and Main Physiological Indexes of Chinese Cabbage

为探明负压灌溉条件下小白菜生长发育的适宜负压和土壤含水量,采用土壤盆栽试验结合负压灌溉技术,研究2种土壤(潮菜园土、红菜园土)和3个供水负压(-5.0 k Pa、-10.0 k Pa、-15.0 k Pa)对小白菜生长发育及生理指标的影响。结果表明,小白菜生物产量和根系活力在2种供试土壤条件下均以-5.0 k Pa处理最高,随着供水负压值的降低,生物产量和根系活力显著下降;脯氨酸含量以-10.0 k Pa处理最高,显著高于-5.0k Pa和-15.0 k Pa处理;水分利用效率以-5.0 k Pa处理最低,显著低于-10.0 k Pa和-15.0 k Pa处理。综合小白菜生物产量、水分利用效率及对不同供水负压的生理响应,2种供试土壤适宜小白菜生长发育的供水负压值为-5.0 k Pa,土壤含水量潮菜园土为25%,红菜园土为19%。

In order to find out the suitable negative pressure and soil water content for the growth and development of Chinese cabbage under negative pressure irrigation,this paper conducted a pot experiment combining with negative pressure irrigation technology to study the effects of 3 negative pressure levels（-5.0 k Pa,-10.0 k Pa,-15.0 k Pa）on the growth and physiological index of Chinese cabbage in 2 types of vegetable soils（ alluvial garden soil and red-garden soil）. The results showed that the biomass and root system activity（ TTC reduction） of Chinese cabbage was the highest at-5.0 k Pa treatment in 2 types of vegetable soils. Along with the decrease of water supply pressure,biomass and root system activity decreased significantly. Proline content was the highest at-10. 0 k Pa treatment,significantly higher than that of-5.0 k Pa and-10.0 k Pa treatments. Water use efficiency was the lowest under-5.0 k Pa treatment,significantly lower than that of-10.0 k Pa and-15.0 k Pa treatments. By analyzing the biomass,water use efficiency and physiological responses to soil moisture of Chinese cabbage,the suitable negative pressure was-5.0 k Pa in 2 kinds of tested soils,and the moisture content was 25% for the soil derived from alluvial garden soil and 19% for soil derived from red-garden soil.