华北农学报2012，Vol.27Issue(2)：146-151,6.
提高密度对根冠发育及其产量的影响研究
Studies on the Effect of Density on the Root-shoot Relationship and Yield in Maize
摘要
Abstract
Experiment was conducted at Gongzhuling experimental station of Institute of Crop Sciences,Chinese Academy of Agricultural Sciences,Gongzhuling,Jilin Province during 2009 -2010. Changes of plant and population morphological and physiological index were measured using maize hybrids Zhengdan958( ZD) and Xianyu335 (XY) as experimental materials under 52500 plants/ha ( LD ) and 82500 plants/ha ( HD) conditions. Root characteristics distribution among soil layers and the relationships between shoot and roots were also studied by the field root digging method. The results showed that plant character index decreased but the population quality increased with the densities. There were significant increases in population leaf areas and biomass. Root distribution showed a trend of horizontal contraction and vertical extension under high density conditions compared with low density. Root length density ( RLD)was significantly bigger than that of low density population, so the water and nutrition resources could be absorbed more efficiently under high density conditions. Shoot-root ratio was a character of hybrid and it did not change with density at a certain growing stage. Different varieties had their own optimal density, Xianyu335 was more suitable to high density than Zhengdan958 under this experimental conditions. Based on the result of the experiment it was passible to improve the current maize planting density of 52500 plants/ha to 82500 plants/ha in North-east maize production area. This experiment elucidated the mechanism of high-yield under high density conditions, and it is also of a great meaning for high-yielding maize production.关键词
玉米/密度/根系性状/根冠关系/产量Key words
Maize/ Density/Root characteristics/Root-shoot relationship/ Yield分类
农业科技引用本文复制引用
张凤路,牛兴奎,张怡明,李少昆,谢瑞芝,刘鑫,修文雯..提高密度对根冠发育及其产量的影响研究[J].华北农学报,2012,27(2):146-151,6.基金项目
国家重大基础研究项目(2009CB118601) （2009CB118601）
"十二五"国家粮食丰产科技工程河北省项目(2011BAD16B08) （2011BAD16B08）
国家自然科学基金项目(31071362) （31071362）
河北省自然科学基金项目资助(C2008000257) （C2008000257）
