刈割和放牧条件下伊犁绢蒿生物量分配特点

为了解伊犁绢蒿Seriphidium transiliense在不同干扰条件下资源分配特点，分别测定了刈割和放牧条件下根、茎、叶、花（种子）的生物量。结果表明：刈割引起伊犁绢蒿对根生物量分配增加，茎和叶生物量分配减少，随刈割强度的增加，根生物量分配增加8%20%，茎生物量分配减少5%14%，叶生物量分配减少3%6%；放牧引起伊犁绢蒿对根生物量分配增加，茎和叶生物量分配减小，有性生殖分配减少，生物量分配趋势为：根>茎>叶>花/种子，根生物量分配为45%67%，占优势地位，而有性生殖分配较小，在1%以下。且刈牧干扰下，伊犁绢蒿优先将资源分配给营养贮藏器官--根。

Biomass allocation patterns of Seriphidium transiliense under clipping and grazing conditions

In order to understand the resource allocation pattern under clipping and grazing conditions, the biomass of root, stem, leaf and flower (seed) of Seriphidium transiliense was measured. The results showed that the clipping treatment increased the biomass allocation to root but reduced that to stem and leaf, and with the increase of clipping intensity the ratio of biomass allocation to root increased by 8% to 20% with the increasing clipping intensity, the ratio to stem and leaf relevantly decreased by 5% to 14% and 3% to 6% respectively. The grazing treatment showed the same impact. The biomass allocation pattern was root > stem > leaf > flower (seed), the biomass allocated to root accounted as much as 45% to 67%, and biomass for sexual growth was less than 1%. The priority of biomass was given to reserve organ (root) under clipping and grazing conditions.