沙蒿、油蒿空间构件及固沙机制研究

油蒿和沙蒿同属菊科、蒿属的沙生半灌木，抗旱性强，生态幅宽，在沙区人工植被中可天然更新，是我国干旱沙区优良的固沙植物种。由于油蒿能够进行光合的部件远多于沙蒿且相对沙蒿能够更好地利用空间资源，在相同的时间内油蒿经光合沉积的生物量远大于沙蒿。受个体空间结构、生物量分配模式及种群整体特征的共同影响，在生存环境相同的情况下油蒿的个体及种群固沙效益要比沙蒿高。

The Space Construction of Artemisia arenaria and A. ordosica and the Research of Dune-fixating Mechanism

Both Artemisia and A. ordosica are sandy semi-bush and belonging to the Artemisia, Compositae. They are excellent dune-fixating species in arid sandy area in our country just because they have such advantages as strong drought resistance, wide ecological breadth, and can renovate naturlly. At the same living environments, comparing with A. arenaria, A. ordosica has much higher availability to the elements for photosynthesis and makes the best of spatial resources. During the same time period, A. ordosica deposits much more biornass than A. arenaria after photosynthesis. Influenced by individual interspatial structure, distribution pattern of biomass, and the integral character of the population, A. ordosica has higher individual and population dune-fixating effects than A. arenaria at the same living environments.