引种前后除虫菊花头生长发育的比较研究

通过对引种地和栽培地除虫菊花头生长发育状况的比较，发现，引种前后除虫菊花头的生长发育时间、平均干物质重量、除虫菊酯的积累等方面存在着较大的差别，并通过对这些差别的讨论，我们阐述了生态条件对引种的影响，认为生态条件的差异是导致除虫菊花头生长差异的主要原因。

Comparative Studies on the Development of Pyrethrum Flower Head Before and After Introduction

Through the comparison of the development of pyrethrum flower head between the native and the acclimated region, great differences are found in the developing time, the average weight of dry matter, and the pyrethrin accumulation of pyrethrum in norescence. Furthermore, we discuss the influences of ecological conditions on the introduction, and think the growth changes of pyrethrum flower head resulting from the alteration of the ecological conditions after introduction.