青藏高寒草地植被生产力与生物多样性的经度格局
发布时间：2019-06-13 17:39
【摘要】：沿昌都到噶尔县的经度梯度,对西藏典型高寒草地植被生产力与植物多样性开展了1 700 km的野外样带调查。实验结果表明:高寒草地的群落结构特征(地上生物量、地下生物量、盖度和密度)与生物多样性(物种丰富度、物种多样性和物种均匀度)均具有明显的经度分布格局。整体而言,这些特征参数均表现出自西向东沿荒漠草原—典型草原—草甸草原呈逐渐递增的趋势;其经度格局主要受降雨量和平均气温所趋动,但降雨量和平均温度的影响在不同指标间存在较大差异;地上生物量由二者共同决定,而物种丰富度受降雨量的影响更大。西藏高寒草地的物种丰富度与地上生物量间存在显著的幂指数关系(y=0.219 7 x~(0.754 9),R~2=0.61,P0.01)。上述规律的发现,不仅有利于我们更好地理解高寒草地对未来气候变化的响应机制与适应途径,也将帮助我们合理制定放牧策略以实现该地区高寒草地的可持续发展。
[Abstract]:Based on the longitude gradient from Changdu to Gaer County, the vegetation productivity and plant diversity of typical alpine grassland in Tibet were investigated by 1 700 km field transect. The results showed that the community structure characteristics (above ground biomass, underground biomass, coverage and density) and biodiversity (species richness, species diversity and species evenness) of alpine grassland had obvious longitude distribution pattern. On the whole, these characteristic parameters show a gradual increasing trend from west to east along desert steppe, typical grassland and meadow grassland, and their longitude pattern is mainly driven by rainfall and average temperature, but the influence of rainfall and average temperature is quite different among different indexes. The above ground biomass is determined by both of them, and the species richness is more affected by rainfall. There was a significant power exponential relationship between species richness and aboveground biomass in alpine grassland in Tibet (y 鈮，
本文编号：2498695
[Abstract]:Based on the longitude gradient from Changdu to Gaer County, the vegetation productivity and plant diversity of typical alpine grassland in Tibet were investigated by 1 700 km field transect. The results showed that the community structure characteristics (above ground biomass, underground biomass, coverage and density) and biodiversity (species richness, species diversity and species evenness) of alpine grassland had obvious longitude distribution pattern. On the whole, these characteristic parameters show a gradual increasing trend from west to east along desert steppe, typical grassland and meadow grassland, and their longitude pattern is mainly driven by rainfall and average temperature, but the influence of rainfall and average temperature is quite different among different indexes. The above ground biomass is determined by both of them, and the species richness is more affected by rainfall. There was a significant power exponential relationship between species richness and aboveground biomass in alpine grassland in Tibet (y 鈮，
本文编号：2498695
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