不同滴灌施氮模式对甜糯玉米碳利用的影响  

Effects of Different Drip Irrigation and Nitrogen Application Modes on Water and Carbon Utilization of Sweet Waxy Corn

作　　者：程浩 傅丰贝 李伏生[1] CHENG Hao;FU Feng-bei;LI Fu-sheng(College of Agricultural,Guangxi University,Nanning 534004,China)

机构地区：[1]广西大学农学院,南宁530004

出　　处：《节水灌溉》2021年第6期37-42,共6页Water Saving Irrigation

基　　金：广西科技计划基地和人才专项(AD17195060)。

摘　　要：为揭示有利于提高甜糯玉米水分利用效率和固碳能力的水氮管理模式,通过盆栽实验,研究了不同滴灌施氮模式对甜糯玉米干物质量、产量、水分利用效率以及碳含量和碳固定的影响。结果表明:①交替滴灌下,中氮水平(0.15 g N/kg土)处理以干物质量为基础的水分利用效率(WUEs)和以产量(籽粒)为基础的水分利用效率(WUE_(t))最高。②与苗期-开花期常规滴灌(CC)相比,苗期-开花期交替滴灌(AA)玉米耗水量降低19.7%~20.8%。中氮水平下,AA模式WUEs和WUE_(t)较CC模式分别提高33.8%和35.8%。③中氮水平时,与CC模式相比,AA模式地上部、籽粒和全株固碳量分别提高16.5%、16.5%和16.3%。④相同滴灌模式下,中氮水平下玉米植株含碳量与固碳量最高。因此,中氮水平下AA模式玉米水分利用效率和固碳能力最高,是甜糯玉米适宜的水氮管理模式。In order to reveal the water and nitrogen(N)management mode which can improve water use efficiency and carbon fixation capacity of sweet waxy corn,a pot experiment was conducted to study the effects of different drip irrigation and N application modes on dry mass,yield,water use efficiency(WUE),carbon content and carbon fixation of sweet waxy corn.The results showed that:①under alternate drip irrigation,the WUE based on dry mass(WUEs)and the WUE based on grain yield(WUE_(t))were the highest under medium N level(0.15 g kg^(-1) soil).②compared with conventional drip irrigation from seedling stage to flowering stage(CC),the water consumption of maize under alternate drip irrigation from seedling stage to flowering stage(AA)by 19.7-20.8%.Under the medium N level,AA mode increased WUEs and WUE_(t) by 33.8%and 35.8%compared to CC mode,respectively.③Under the medium N level,compared with CC mode,AA mode increased carbon fixation of shoots,grains and plants by 16.5%,16.5%and 16.3%,respectively.④Under the same drip irrigation mode,the carbon content and fixation of corn plants were the highest under medium N level.Thus AA mode had the highest water use efficiency and carbon fixation capacity of sweet waxy corn under the medium N level,which was the suitable water and nitrogen management mode for sweet waxy corn.

关 键 词：甜糯玉米 水氮运筹 分根区交替灌溉 水分利用效率 固碳 

分 类 号：S274.3[农业科学—农业水土工程] S513[农业科学—农业工程]