内蒙古鄂尔多斯草地生态系统国家野外科学观测研究站
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鄂尔多斯生态站人员在草地植物共存机制方面的研究被Journal of Vegetation Science接收发表
作者: 鄂尔多斯生态站 更新时间: 2016-10-26
     叶学华等. 2016. 植物对沙埋、降水增强和气候波动响应的种间差异促进了植物共存. Journal of Vegetation Science. doi:10.1111/jvs.12464.
     Ye XH et al. 2016. differential plant species responses to interactions of sand burial, precipitation enhancement and climatic variation promote co-existence in Chinese stepe vegetation.
     沙埋和降水对干旱风沙区植被的建成具有重要的作用。二者在时空异质性非常高,而不同的植物种对沙埋和降水变化有着不同的适应能力,从而在群落中占据不同的生态位,因此,我们假设在干旱风沙区沙埋和降水变化是植物群落物种共存的一种促进机制。在鄂尔多斯生态站开展的一个2年的野外控制实验结果表明,物种、沙埋和降水增强对植物群落优势种的盖度具有多种交互作用,同时这几个因子的作用也存在着显著的年内或年际间的变化。这意味着干旱风沙区植物群落中植物种的共存可以通过它们对沙埋和降水及气候波动的不同适应能力或者说是它们占据的不同生态们来解释。
     Aims: Sand burial and precipitation play important roles in vegetation of inland deserts and desertified areas, and both are under strong influence of climate and land-use change. Sand deposition and precipitation both vary greatly in space and time, and different plant species, with diverse adaptations, occupy different niches along spatial gradients in the combination of sand and water availability dynamics.We hypothesized that species specificity in spatial and temporal niche occupation along such gradients is a mechanism for their co-existence and, thereby, a driver and stabilizer of biodiversity in dry, sandy areas.
     Location: Ordos Plateau, China.
     Methods: We conducted a 2-yr field experiment with factorial treatments of precipitation (control, slight enhancement, strong enhancement) and sand addition (control, medium addition, large addition). Plant cover of the six dominant species was followed over different seasons, as we expected different species to benefit from different treatments in different seasons and years with different weather regimes.
     Results: Sand burial alone significantly affected plant cover of all six dominant species, while precipitation enhancement had no significant effect. Effects of sand burial on plant cover changed overall during the two hydrologically contrasting years. Our key finding was that thereweremultiple significant two- and three-way interactions between species, sand burial and precipitation enhancement on plant cover, while there were also multiple two- and three-way interactions involving species, sand burial or precipitationtreatment with year and/or season.
     Conclusion: Our results supported our hypothesis, i.e. the co-existence of species in a semi-arid sand dune can be explained from the different niches they occupy in terms of seasonal and year-to-year variation in precipitation in combination with sand deposition regime. The interactions of these drivers on plant coverwith experimental enhancement of precipitation, mimicking a realistic scenario for this region, suggest that shifts in species composition are to be expected this century.More generally, our findings advance our understanding of what drives species co-existence and thereby biodiversity, nowand in the future.
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