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以平邑甜茶(Malus hupehensis Rehd.)幼苗为试材,在盆栽条件下研究了田间实测浓度的有机酸(草酸、酒石酸、柠檬酸和苹果酸)对连作幼苗光合特性、叶片保护性酶活性以及根系生长的影响。结果表明,与对照相比,草酸可使平邑甜茶幼苗植株干质量和鲜质量分别增加24.12%和35.72%。叶片净光合速率、气孔导度分别提高32.27%和76.58%。并显著提高了过氧化物酶(POD)和过氧化氢酶(CAT)活性。酒石酸则降低了平邑甜茶幼苗叶片的气孔导度40.22%,SOD、POD活性亦显著降低。试验结果还表明,柠檬酸和苹果酸也促进了平邑甜茶幼苗的生长。综上,在本试验条件下,草酸能够减轻平邑甜茶幼苗连作障碍现象,酒石酸有加重连作障碍趋势,柠檬酸和苹果酸对连作障碍不明显。
Taking the seedlings of Malus hupehensis Rehd. As test materials, the effects of organic acids (oxalic acid, tartaric acid, citric acid and malic acid) measured in the field on photosynthetic characteristics, protective enzyme activity of leaves and Effects of root growth. The results showed that compared with the control, oxalic acid could increase the dry weight and fresh weight of the seedlings of H. amurensis by 24.12% and 35.72%, respectively. The net photosynthetic rate and stomatal conductance increased 32.27% and 76.58% respectively. And significantly increased peroxidase (POD) and catalase (CAT) activity. Tartaric acid reduced the stomatal conductance of P. euphratica seedling leaves by 40.22% and the activity of SOD and POD significantly decreased. The test results also show that citric acid and malic acid also promote the growth of Malus hupehensis seedlings. In summary, under the experimental conditions, oxalic acid can alleviate the continuous cropping obstacle of the seedling of Malus hupehensis, tartaric acid aggravates the trend of continuous cropping obstacle, citric acid and malic acid have no obvious obstacle to continuous cropping.