模拟降雨格局变化对虎尾草分株和根系特征的影响

作为全球气候变化的重要组成部分,降雨格局变化能够对各类植物产生不同的影响.虎尾草为退化盐碱草地恢复的主要先锋种植物之一,降雨格局变化如何影响其分株和根系等特征对于全球变化背景下退化盐碱地的生态恢复至关重要.本研究通过人工模拟降雨格局变化试验,设置了3个降水量(减少30％、不变、增加30％)和2个降雨间隔(1、2d),研...

Effect of simulated changes in rainfall patterns on characteristics of ramets and roots of Chloris virgata

As an important part of global climate change， changes in rainfall patterns will have different effects on various types of plants. Chloris virgata is one of the main pioneer species for the restoration of degraded saline-alkali grasslands. To design optimal ecological restoration strategies for degraded saline-alkali land in the background of global change， it is important to understand how the changes in rainfall patterns will affect the characteristics of ramets and roots of C. virgata. We determined the effects of several simulated rainfall patterns （decreased by 30%， unchanged， increased by 30%） and rainfall intervals （1 and 2 days） on the aboveground ramet and underground root morphological characteristics of C. virgata. It was found that： 1） The changes in rainfall pattern had almost no effect on the sexual reproduction characteristics of C. virgata. With increasing rainfall amount or increasing rainfall interval， vegetative reproductive characteristics tended to be enhanced. 2） Rainfall interval and rainfall amount had different effects on the roots of C. virgata. Rainfall interval had the greatest influence， although two factors were interdependent. When the rainfall amount was unchanged， the total root length， total root surface area， total root volume， and root diameter decreased significantly with increasing rainfall interval. 3） Both rainfall amount and rainfall interval affected biomass accumulation， with rainfall interval being more important. The root biomass， stem biomass， and total biomass significantly decreased with increasing rainfall interval， and the biomass of leaves and inflorescences showed a decreasing trend， but this was not statistically significant.