摘要
【目的】研究新疆春玉米不同种植密度下光截获率的变化,探讨通过改进栽培措施,提高作物光能利用率进而提高产量的技术途径。【方法】选用新疆当地推广玉米品种新玉41号、较耐密性品种中单909为材料,设置3个种植密度处理,分别为4.5×104、7.5×104和10.5×104株/hm2;分别在玉米生长的拔节期、抽雄期、吐丝期、乳熟期、蜡熟期测定不同密度下玉米冠层光截获率、生物量累积等,计算光能利用率。【结果】随种植密度的增加,玉米叶面积指数增大,冠层光截获率增加,玉米光能利用率增加。在适宜种植密度范围内,光能利用率与作物生长率、籽粒产量呈线性关系。【结论】冠层有效光截获量是影响玉米干物质积累的主要因素,玉米叶面积指数对光能利用率和作物群体生长率有一定的影响,通过增加种植密度提高玉米的光能利用率及籽粒产量。
【Objective】To explore the approach of enhancing radiation use efficiency( RUE) and crop yield,this study examines the light interception rate of spring maize under the different plant densities in Xinjiang. 【Method】The recommended local cultivar Xinyu 41 and the introduced higher density- tolerant cultivar Zhongdan 909 were grown under three plant densities,including 4. 5 × 104 plants / hm2,7. 5 × 104 plants /hm2 and 10. 5 × 104 plants / hm2. A detailed investigation was conducted by measuring light interception rate in canopy,dry matter accumulation,as well as RUE at jointing stage,tasseling stage,silking stage,milk-ripe stage and waxy- ripe stage.【Result】Leaf area index( LAI),light interception rate and RUE increased with plant density increasing. There was a line relationship between growth rate,RUE and grain yield in this study.【Conclusion】Light interception amount was a major factor affecting dry matter accumulation under different plant densities. LAI had some impact on RUE and growth rate. Increased plant density was an approach for spring maize to improve RUE and grain yield in Xinjiang.
出处
《新疆农业科学》
CAS
CSCD
北大核心
2015年第12期2166-2172,共7页
Xinjiang Agricultural Sciences
基金
国家自然科学基金项目(31160261)~~
关键词
春玉米
光能利用率
种植密度
叶面积指数
产量
spring maize
radiation use efficiency
plant density
leaf area index
yield
