关键词: 生姜, 土壤水分, 光照, 形态特性, 产量

Abstract: A hydroponic experiment with twelve pakchoi cultivars was conducted to study the cadmium (Cd) accumulation in their aboveground part, and the correlations of this accumulation with the transpiration rate and root characters (root length, root surface area, and root volume) of the cultivars. There were significant differences in the Cd absorption and accumulation among the cultivars. The Cd concentration in the fresh shoot of pakchoi ranged from 1.8 to 4.4 mg·kg^-1, with 1.5-fold difference among the cultivars. There were also significant differences in the transpiration rate and root morphology among the cultivars. Transpiration rate, root surface area, and root volume all had significant positive linear correlations with the Cd concentration and the total amount of absorbed Cd in the aboveground part of pakchoi (P<0.01), while root length only had a significant positive correlation with the total amount of absorbed Cd, suggesting that high intensity of transpiration and developed root system could promote the Cd accumulation in edible parts of pakchoi.

Key words: Ginger, Soil water, Light intensity, Morphologic characteristics, Yield