摘要
试验于2007—2008年进行,在相同密度下,设置5种处理,即行距×株距分别为A:18cm×18cm,B:27cm×12cm,C:36cm×9cm,D:45cm×7.2cm,E:54cm×6cm,研究其对干物质积累分配及产量的影响。结果表明,A、B处理叶面积指数分别高出E处理30%、25%,差异显著;A、B处理干物质总量分别高于E处理20%、19%,差异显著,C、D、E处理间无显著差异;A、B、C处理分枝豆荚重量和总豆荚重量显著高于E处理,D、E间无显著差异;A、B处理产量分别高于E处理11%、10%,差异显著,C、D、E处理间无显著差异。植株分布均匀性变差使群体内部对资源的利用产生激烈竞争,降低了群体叶面积指数,从而使干物质积累量以及分配比例减少,最终导致产量下降。因此,在确定的种植密度下较均匀的植株分布能够使光合产物积累分配合理,形成较高经济产量。由于A、B处理间无显著差异,而B处理方便于实际生产过程中的栽培管理,所以,本文推荐B处理为大田生产的最优群体。
The experiment was carried out in 2007-2008. The five treatments of plant density patterns under the same plant density were A： 18 cm×18 cm, B： 27 cm×12 cm, C： 36 cm×9 cm, D： 45 cm×7.2 cm, E： 54 cm×6 cm in row spacing （cm） xplant spacing （cm）. The results showed that the average leaf area index in treatments A and B was 30% and 25% significantly higher than that in treatment E respectively in the whole growing period across the two years. Comparing with treatment E, the dry matter accumulation in treatments A and B was increased significantly by 30% and 19% at the whole growing stage in the two years, respectively, treatments C, D, and E had no significant difference between each other. The number of pods and pods per branch in treatments A, B, and C were significantly higher than those in treatment E in the two years, while there was no significant difference between treatments D and E. Treatments A and B were 11% and 10% significantly higher than treatment E in average yield in the two years, respectively, while there was no significant difference between treatments C, D, and E. The leaf area index （LAI） decreased with the increase of row spacing that caused intense competition for ecological resources, and thus the reduction in dry matter accumulation and partitioning, and eventually the yield decreases. These results indicate that summer soybean population with relatively uniform plant density leads to rational dry matter partitioning and high yield. For dry matter accumulation and yield, treatments A and B had no significant difference, but treatment B was better for cultivation and management in the actual production process, suggesting that treatment B is the best plant density pattern for a population.
出处
《作物学报》
CAS
CSCD
北大核心
2009年第9期1722-1728,共7页
Acta Agronomica Sinica
基金
国家重点基础研究发展计划(973计划)项目(2005CB121106)资助
关键词
群体
夏大豆
干物质
产量
Plant density pattern
Summer soybean
Dry matter
Yield
