2种生态条件下栽培密度对水稻干物质积累与转运的影响

Effect of Planting Density on Dry Matter Accumulation and Transportation under Two Different Ecological Conditions

以金优527、昌米011、9优418和合系39 4种不同类型水稻为材料,研究了在西昌和雅安两种不同生态条件下栽培密度对水稻干物质积累与转运影响。结果表明:水稻分蘖盛期、拔节期、孕穗期、齐穗期、成熟期干物质量以及收获指数西昌均显著高于雅安;随着栽培密度增加,两试验点水稻分蘖盛期、拔节期、孕穗期、齐穗期、成熟期干物质重均增加,且在稀植、中密、高密间均存在显著性差异;分蘖盛期-成熟期水稻叶片干物质分配率西昌显著低于雅安,分蘖盛期-抽穗期茎鞘干物质分配率西昌显著高于雅安,成熟期时茎鞘干物质分配率西昌显著低于雅安;随栽培密度的增加,抽穗期穗中干物质分配率显著增加,成熟期叶片、茎鞘、穗中干物质分配率在3栽培密度间不再存在显著性差异;西昌点各生育阶段的平均生长率均显著大于雅安点,各密度水平的群体生长率均随生育期的推进,先增加后减小,减小栽插密度可使群体生长率最大值出现的生育盛期提前。

Four different types of rice including Jingyou.527, Changmi011, Jiuyou418 and Hexi39 were used as material to canT out field experiment in Xichang and Yaim in order to discover effect of planting density on dry matter accumulation and transportation under the two different ecological conditions in this study. The results showed as follows： the dry matter accumulation and harvest index at tillering stage, jointing stage, booting stage, full heading stage and maturity stage in Xichang were significantly higher than that in Ya＇an; with the increase in planting density, dry matter accumulation at tillering stage, jointing stage, booting stage, full heading stage and maturity stage in two test points increased too, and there were significant differences in the rare-dansity, medium-dansity, high-dansity; from tillering stage to maturity stage, the distribution of dry matter of leaf in Xichang were significantly lower than in Ya＇an but significantly higher than that in Ya＇an from tiUering stage to heading stage, and significantly lower than that in Ya＇an at maturity stage; with the increase in planting density, distribution of dry matter at heading stage increased significantly, but distribution of dry matter of leaf, stem and ear had no significant differences in the rare-density, medium-density, high-density at maturity stage;the average growth rate of each stage in Xichang was significantly higher than that in Ya＇an; the population growth rate of each density level increased firstly and then decreased with the advance of the growth period; reduce of the planting density can make the maximum growth rate of population growth in the early stages of growth.