模拟降雨格局变化下白刺(Nitraria tangutorum)表型变异

Phenotypic Variation of Nitraria tangutorum under Simulated Precipitation Patterns Change

在全球气候变化背景下,明确植物种子、叶片性状的变化趋势和幅度是正确预测植被动态过程,提出合理的植被管理建议的基础。但目前关于种子和叶片性状如何响应降水格局变化,即降雨量及其分布对种子、叶片表型变异的研究尚很少见。通过人工模拟增雨设置了6个增雨处理,3个处理考虑季节分配即生长季前期增雨、生长季后期增雨、生长季均匀增雨,2个处理考虑增雨量,即多年平均年降水量的50%和100%,研究了典型荒漠植物白刺(Nitraria tangutorum)表型形态特征对不同增雨处理的适应策略以及各性状间的相关关系。结果表明:增加雨量显著减小了白刺种子的长度、体积、表面积和千粒重,在生长季增雨100%处理下的白刺种子变异最大,同时期两个增雨量处理间差异均显著(P<0.05)。相同增雨量条件下,不同时期增雨对白刺比叶面积的影响差异性显著(P<0. 05),但同时期增雨的两个处理之间无显著差异(P>0. 05)。种子大小与比叶面积显著负相关(P<0. 05)。

Under the background of global climate change,the change trend and amplitude of plant seeds,leaf traits are correctly predict vegetation dynamic process,the basis of the reasonable management of vegetation are put forward.But at present,about how to respond to seed and leaf traits precipitation pattern change,namely rainfall and its distribution on the study of phenotypic variation seed,leaf is very rare. This study through artificial simulated rainfall set up six precipitation enhancement processing,three processing consider seasonal distribution of precipitation enhancement is the early stage of the growing season,the late growing season precipitation,homogeneous precipitation growth season,two treatment increased rainfall,that is 50% and 100% of the average annual precipitation for many years,to study the typical desert plants Nitraria tangutorum phenotypic characteristics of different precipitation enhancement processing to adapt to the strategy as well as the relationship between the various characters. Results showed that compared with the control,the increase of rainfall significantly reduced the length of the N. tangutorum seed,volume,surface area and thousand grain weigth,in the growing season precipitation enhancement processing under 100%,N. tangutorum seed revealed the greatest variation,at the same time were significant difference between the two rainfall increased( P<0.05). The same increase rainfall condition,different period,the influence of precipitation enhancement than specific leaf area difference significant( P<0.05),but at the same time of precipitation between two treatment had no significant difference( P>0.05). Seed size and specific leaf area were significantly negative correlation( P<0.05).