半干旱区春小麦生长冗余的研究

Growth redundance of spring wheat in semiarid area

通过对4个春小麦品种在产量、根量与根冠比等方面的比较,发现在水分严重胁迫条件下,古老的春小麦品种和尚头表现出相对较高的产量;但在水分条件改善后,其产量最低。古老品种较之现代品种具有更大的地下生物量和根冠比(开花期)。这表明自然条件下接近进化稳定对策(ESS)的地方品种,在土壤水分条件较好时存在着生长冗余,从而阻碍产量提高。因此,减少冗余,特别是地下部分的冗余可能是干旱、半干旱地区小麦增产的一条有效途径。

Cultivars comparison of spring wheat in product,root mass and ratio of root/shoot showed that landrace monkhead is more productivity under serious water deficit stress,but when the soil water condition improving,its product is the lowest. Comparing with modern cultivars,ancient landrace had much biomass of underground part and higher ratio of root/shoot. It showed that cultivar which approaching evolutionary stable strategies(ESS) in natural condition has growth redundance as soil water condition improving. The redundance is an obstacle for product improving. Decreasing redundance, especially in underground part, should be an effective method for product improvement in arid and semiarid region.