作　　者： ; ;

机构地区： 华南农业大学农学院热带亚热带生态研究所

出　　处： 《应用生态学报》 1999年第2期193-196,共4页

摘　　要： 研究了不同生育期遮光４５％（水稻生长的前期、中１期、中２期、后期）对水稻形态发育、光合产物积累、稻株养分含量、产量构成等的影响，并重点研究了植株对Ｎ、Ｐ、Ｋ养分的吸收规律．结果表明，各期遮光后均使干物质积累速率降低，植株Ｎ、Ｐ、Ｋ养分吸收量减少，对产量有不同程度的影响，但植株体内Ｎ、Ｐ、Ｋ养分含量上升．前期遮光主要使分蘖数急剧下降，有效穗数减少，叶面积系数下降，产量下降１１．５６％，但株高增加；中１期遮光后对水稻生长影响不大，产量仅降低５．４６％；中２期遮光主要使每穗粒数和千粒重下降，对产量影响较大，降低幅度达３０．８０％；后期遮光主要影响结实粒和千粒重，其产量最低，降低５５．４０％． Field experiments under 45% shading at different stages(early, middle 1, middle 2 and later stages) of rice growth show that regardless of different stages, shading decreased the accumulation rate of dry matter and the uptake of nutrients, but increased the nutrient content in rice plant, and affected its yield in varying degrees. Shading at early growth stage mainly decreased tiller number, effective panicle number and leaf area index, and reduced yield by 11.56%, but increased plant height. At middle 1 stage, shading showed no significant influence on rice growth, and the yield was reduced by only 5.46%. At middle 2 stage, shading mainly decreased grains per panicle and 1000 grain weight, and the yield was reduced markedly by 30.80%. At later stage, shading decreased the percentage of filled grains and 1000 grain weight, and the yield was the lowest, reduced by 55. 40%. Suggestions on the way of regulating sowing and transplanting dates and making fertilization decision under low light intensity also put forward in this paper.

关 键 词： 遮光 生长发育 养分吸收 产量构成

领　　域： [农业科学]