摘要
为探讨灌水量与加气对干播湿出棉花幼苗的叶绿素、光合特性及干物质的影响,试验共设计了 6个处理(WP1-WP6),其中WP1,WP2与WP3处理灌水定额分别为150,225与300 m3/hm2,加气量分别为3 600,5 400与7 200 L/hm2;WP4,WP5与WP6处理灌水定额分别为150,225与300 m3/hm2,试验处理均不加气(作为对照).结果表明:随灌水量与加气量的升高,棉花幼苗叶片叶绿素含量呈先升高后降低的趋势,加气较不加气处理叶绿素含量最大可提高12.56％.加气对光下最大荧光Fm'、光下最大光能利用效率Fv'/Fm'、光下光系统PSⅡ潜在光化学活性Fv'/F0'、实际原初光能捕获效率Yield具有提升效果.与非加气处理相比,加气处理的叶片净光合速率、蒸腾速率、气孔导度分别增加了 0.4 μmol/(m2·s),0.2 mmol/(m2·s)与 3.0 mmol/(m2·s)以上,胞间CO2浓度降低了 9 mmol/mol.同等灌水定额下,加气处理的干物质较非加气处理均有显著增加,其中WP2处理干物质增加显著.加气灌溉可显著提高棉花叶片叶绿素含量,增强光合作用,提高干物质积累量.
Abstract
In order to investigate the effects of irrigation amount and aeration on chlorophyll,photosyn-thetic characteristics and dry matter of dry-seeded wet-emergent cotton seedlings,six treatments(WP1,WP2,WP3,WP4,WP5 and WP6)were designed for the experimental study.The irrigation quota for WP1,WP2 and WP3 treatments was 150,225 and 300 m3/hm2,respectively,with corre-sponding irrigation amounts of 3 600,5 400 and 7 200 L/hm2,respectively.The irrigation quota of WP4,WP5,and WP6 treatments was 150,225 and 300 m3/hm2,respectively,and the experimental treatments were not aerated(as a control).The results show that with the increase of irrigation amount and aeration,the chlorophyll content of cotton seedling leaves increases first and then decreases,and the chlorophyll content of cotton seedling leaves increases by 12.56％compared with those without ae-ration.Aeration can increase maximum fluorescence under light,maximum light energy utilization effi-ciency under light,potential photochemical activity of the photosystem PS Ⅱ under light,and actual primary light energy capture efficiency.Compared with non-aerated treatment,the net photosynthetic rate,transpiration rate,and stomatal conductivity of leaves in aerated treatment increase by more than 0.4 μmol/(m2·s),0.2 mmol/(m2·s)and 3.0 mmol/(m2.s),respectively,and the intercellular CO2 concentration decreases by more than 9 mmol/mol.Under the same irrigation quota,the dry matter of aerated treatment significantly increases than that of non-aerated treatment,and the dry matter of WP2 treatment increases significantly.Aerated irrigation can significantly increase the chlorophyll con-tent,enhance photosynthesis,and increase dry matter accumulation in cotton leaves.
基金项目
国家自然科学基金资助项目(52269017)
新疆维吾尔自治区"天山英才"科技创新领军人才项目(2022TSYCLJ0069)
新疆维吾尔自治区公益性科研院所基金项目(KY2023109)
新疆维吾尔自治区重大科技专项项目(2022A02007-3)
维普
万方数据