摘要
增加种植密度是提高高粱产量的重要措施,但密度增加使得高粱群体的冠层更加郁闭,如何在高密度下改善冠层特性成为保障高粱高产的重要条件。在高密度(1.25×105株.hm-2)条件下,采用不同种植方式(大垄双行、等行距和穴播)构建3个不同的高粱群体,对它们的冠层叶片结构性状、功能叶光合特性、冠层微环境以及产量进行比较研究。结果表明:在3个高粱群体中,大垄双行种植群体产量最高,为7808.9kg.hm-2,其冠层顶部叶片叶面积较小、叶向值高、相对挺直,功能叶的光合优势也较明显,此外,比较其他群体,该群体叶面积指数适宜,光照分布合理,通风性好。综合分析表明,在高密度种植条件下,大垄双行种植方式能够优化群体植株的冠层结构,改善光合生产环境,有明显的增产优势。
High planting density is an important measure for the increase of sorghum yield.High planting density,however,makes the crop canopy more closed and shaded,how to improve the canopy patterns will be the key for achieving high yield.Under high planting density,field experiments were carried out to investigate canopy leaf characteristics,photosynthetic characteristics of functional leaves,canopy micro-environmental factors of sorghum populations during filling stage.The results showed that among the three sorghum populations,the treatment of double rows in a broad ridge had the highest yield（7808.9kg·hm-2）,relatively small top leaves,high orientation value and erect status,and superior photosynthetic function.Moreover,the population had many good characters including optimum LAI,reasonable light distribution and good ventilation.On the basis of the experimental results,it was suggested that under high planting density the double rows in a broad ridge could optimize canopy structure,improve photo synthesis,and increase grain yield.
出处
《沈阳农业大学学报》
CAS
CSCD
北大核心
2011年第4期406-410,共5页
Journal of Shenyang Agricultural University
基金
国家现代高粱产业技术体系建设专项资金项目(CARS-06-02-02)
辽宁省教育厅创新团队项目(2008T173)
关键词
灌浆期
高梁群体
冠层特性
filling stage
sorghum populations
canopy characteristics
