刈割对稻田杂草野慈菇生物量生殖分配的影响

Influence of Mowing on Biomass Reproductive Allocation of Paddy Field Weed Sagittaria trifolia

在不同刈割强度下,测定稻田杂草野慈菇根茎、叶、附属器官(花葶)、花、果的生物量。结果表明,从盛花期到结实期,各器官生物量及总生物量呈增加趋势,根茎生物量分配比例上升,叶生物量分配比例下降,生殖器官生物量分配比例上升;在盛花期,生物量格局表现为叶>根茎>附属器官(花葶)>花,随着刈割强度的增加,根茎生物量分配呈减小趋势,叶生物量分配呈增加趋势;在结实期分配格局为根茎>叶>果>附属器官(花葶),优先将生物量分配给根茎,随着刈割强度的增加,根茎生物量分配呈上升趋势,叶生物量分配呈下降趋势;中度刈割是野慈菇生殖分配策略发生改变的转折点,并且中度和重度刈割条件下的有性和无性繁殖策略也不同。

In order to understand the reproductive allocation pattern under different mowing conditions,the biomass of root and stem,leaf,scape,flower and fruit of Sagittatia trifolia was measured.The results indicated that from flowering stage to ripening stage,each organ biomass and the total biomass increased,biomass allocation to root and stem increased,to leaf decreased,to the reproductive organs increased.In flowering stage,biomass allocation pattern showed that leaf root and stem scapeflower,and biomass allocation to root and stem decreased,to leaf increased with mowing intensity increased.In ripening stage,biomass allocation pattern showed that root and stem leaf fruitscape,the priority of biomass was allocate to reserve organ（root and stem）,and biomass allocation to root and stem increased,to leaf decreased with mowing intensity increased.Meanwhile,moderate mowing was the turning point of Sagittatia trifolia reproductive allocation strategy changed,and sexual and asexual reproductive strategy was different under moderate and serious mowing.