高麦草生长及其结构与单株穗重关系的探讨

APPROACH OF ELYMUS ELONGATUS GROWTH AND RELATION BETWEEN ITS GROWTH PARTS AND SINGLE PLANT SPIKELET WEIGHT

高麦草在河西走廊中段的生长条件下，播种次年可收获种子，通过分析各生长构件：叶、茎、叶鞘重量，第一节至第三节节长、第一叶片至第三叶片的叶片长、小穗数和穗长与单株穗重的关系，发现：在所有的生长构件中，穗重最重要的构成因素是叶鞘重（Ｘ＿３），其次是茎重（Ｘ＿２）和叶重（Ｘ＿１），通过叶鞘重对穗重产生间接正效应；穗长和小穗数是穗重形成的影响因素，表明高麦草的种子产量与营养器官密切相关，同步增长。穗重由构成因素和影响因素共同决定的预测回归模型为：穗重（ｙ）＝０．１１９６－２．５６３茎重＋１．０７６叶鞘重＋０．０２０４穗长。

Toll wheatgrass(Flymus elongatus)was intreduced into Hexi Corridor and the performance of developm-ent was well, in second growth year,the seeds could be collected.The growth modules as weights of leaf(X_3),stem(X_2)and leaf sheath(X_3),numbers of panicle(X_1),the lenth of spikelet(X_5);plant(X_6),thefirst to thrid nodes(X_7,X_8, X_9)and the first to third leaf(X(10),X(11),X(12))were investigated to analyze therelationship between them and the individual spikelet yield(y). The results showed that the importantcomponent factors of individual spikelet yield was leaf sheath weight.which add the positive directly effectto individual spikelet yield,the next factors were weights stem and leaf,which add the positive indirectly e-ffect to individual spikelet yield;The lenth of spikelet and the panicle numbers were the influence factorswith spikelet yield;The individual spikelet yield of tall weatgrass related closely to the development organs. The prediction model of individual spikelet yield which decided by component factors and the influence fac-tor was:Y=0.1196-2.563X_2-1.076X_3+0.0204X_5