人工模拟降雨格局变化对白刺幼苗生长的影响

doi:10.11686/cyxb2015076

摘要/Abstract

摘要： 白刺是干旱荒漠区重要的建群植物种,研究其幼苗在不同降雨格局下的响应特征,可以为进一步研究降雨格局变化下白刺灌丛退化以及加快荒漠区植被恢复提供理论依据。本文通过人工控水试验,设置3个降雨量(增加30%、减少30%、不变)和2个降雨间隔时间(增加、不变)研究其对降雨格局变化的响应。结果表明,1)生长季白刺幼苗根长、叶生物量、地上生物量、总生物量和根冠比的变化主要由总降雨量引起;总降雨量对白刺生长的效应与降雨间隔时间紧密相关,但二者无显著交互作用。2)当降雨量一致时,增加降雨间隔时间有利于白刺幼苗冠幅、基径和各器官生物量的累积,尤其使叶生物量增加81%,从而使地上生物量增幅远大于地下生物量,导致根冠比降低。3)当降雨间隔时间一致时,降雨量减少30%对茎、地下生物量无显著影响,仅使根长显著增加86%,叶、地上生物量和总生物量分别显著减少67%,48%,27%,根冠比显著增加74%,高降雨量条件下的生物量均增加但无显著影响。因此,适当的增加降雨量和降雨间隔时间有利于白刺幼苗的生长及促进其植被恢复。

Abstract: Nitraria tangutorum is an important, dominant species in arid desert. Our objective was to explore the responses of N. tangutorum seedlings to various precipitation patterns. This approach will provide basic theoretical data to predict seedling survival in degraded N. tangutorum scrub vegetation, and accelerate desert region recovery. In this article, we report an experiment using simulated rainfall to examine the effect of precipitation (increased by 30%, reduced by 30%, unchanged) and precipitation interval (increased, unchanged) on N. tangutorum seedlings. Differences in root length, leaf biomass, above ground biomass, total biomass and root-shoot ratio under the various simulated precipitation regimes are reported. The total precipitation and precipitation interval both strongly affected N. tangutorum growth, but had no significant interaction. Plant crown, basal diameter and biomass were increased by extended precipitation interval, with the same total precipitation. As a result, the leaf biomass was increased by 81%, so that the above ground biomass accumulation was far greater than for below ground biomass, and the root-shoot ratio was decreased. With unchanged precipitation interval, reduced precipitation had no significant effect on stem and below ground biomass, but root length was increased by 86%; while leaf biomass, above ground biomass and total biomass were reduced by 67%, 48%, and 27%, respectively, and the root-shoot ratio was increased by 74%. The treatment in which precipitation was increased by 30% had no significant effect on biomass. Therefore, appropriate increase of precipitation and precipitation interval promote growth of N. tangutorum seedlings, and vegetation restoration where this shrub is present.

张荣, 单立山, 李毅, 段桂芳, 段雅楠, 张正中, ЖигуновАнатолийВасильевич. 人工模拟降雨格局变化对白刺幼苗生长的影响[J]. 草业学报, 2016, 25(1): 117-125.

ZHANG Rong, SHAN Li-Shan, LI Yi, DUAN Gui-Fang, DUAN Ya-Nan, ZHANG Zheng-Zhong, Жигунов Анатолий Васильевич. Effect of change to simulated precipitation patterns on seedling growth of Nitraria tangutorum[J]. Acta Prataculturae Sinica, 2016, 25(1): 117-125.

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