施肥对旱地农田生态系统冬小麦干物质积累的影响

Effects of fertilization on dry matter accumulation of winter wheat in dryland

研究了施肥对旱地冬小麦总茎数、叶面积系数及干物质积累和经济产量的影响 ,并探讨了这些生长因素与经济产量之间的关系。结果表明 ,施肥使冬小麦分蘖增多 ,总茎数和每公顷成穗数增加 ;使各生育期叶面积系数及干物质积累量增大 ,特别使灌浆期保持较高数值。不同施肥水平下的干物质积累过程均可以用指数方程 y=aeb/x很好拟合 ,而且方程中的 a值随施肥水平提高而增大 ,b值基本稳定。相关分析表明 ,冬前。

The effects of fertilization on the number of all stems, on the leaf area index and on dry matter accumulation during all stages and economic yield of winter wheat in dryland were studied. Also, the relationship between these growth elements and yield was investigated. The results were as follows: Fertilization obviously increased the number of tillings, so increased the number of stems and ears of winter wheat per hectare as well. Similarly, fertilization application enhanced the leaf area index and amount of dry matter accumulation at all stages, esp. at filling time. To all fertilization treatments, the accumulation process of dry matter could be well fitted in the exponential equation y=a e b/x . Moreover, with fertilization amount rising, the a's value raised and b's remained stable. The correlation analysis indicated that the growth condition before winter and during filling stage were more important for yield formation of winter wheat in dryland than that at other stages.