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The allometry of plant height explains species loss under nitrogen addition
Ecology Letters ( IF 8.8 ) Pub Date : 2021-01-10 , DOI: 10.1111/ele.13673 Yao Xiao 1 , Xiang Liu 1 , Li Zhang 1 , Zhiping Song 1 , Shurong Zhou 2
Ecology Letters ( IF 8.8 ) Pub Date : 2021-01-10 , DOI: 10.1111/ele.13673 Yao Xiao 1 , Xiang Liu 1 , Li Zhang 1 , Zhiping Song 1 , Shurong Zhou 2
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Light asymmetry, with a higher light acquisition per unit biomass for larger plants, has been proposed as a major mechanism of species loss after nitrogen addition. However, solid evidence for this has been scarce. We measured the allometric size‐height relationships of 25 plant species along a nitrogen addition gradient manipulated annually for eight years in a speciose alpine meadow and found that the positive relationship between species relative abundance and the height scaling exponent in natural conditions disappeared after nitrogen addition. Those species with lower height scaling exponents increased in relative abundance after nitrogen addition, thereby decreasing the community weighted mean and dispersion of the height scaling exponent and ultimately the species richness. Our results provided some unique evidence for light asymmetry induced species loss after nitrogen addition and a new insight from the perspective of allometric scaling to explain biodiversity maintenance in the face of global changes.
中文翻译:
植物高度的高度变化解释了氮添加后物种的流失
已经提出了光不对称性,对于较大的植物,每单位生物量具有更高的光获取量,是氮添加后物种损失的主要机制。但是,对此的确凿证据很少。我们在一个特定的高山草甸上测量了25种植物物种在沿8年每年操纵的氮添加梯度的尺寸高度-高度关系,发现自然条件下物种相对丰度与高度缩放指数之间的正相关关系消失了。加入氮后,那些具有较低高度比例指数的物种的相对丰度增加,从而降低了群落加权平均数和高度比例指数的分散,最终降低了物种的丰富度。
更新日期:2021-02-12
中文翻译:
植物高度的高度变化解释了氮添加后物种的流失
已经提出了光不对称性,对于较大的植物,每单位生物量具有更高的光获取量,是氮添加后物种损失的主要机制。但是,对此的确凿证据很少。我们在一个特定的高山草甸上测量了25种植物物种在沿8年每年操纵的氮添加梯度的尺寸高度-高度关系,发现自然条件下物种相对丰度与高度缩放指数之间的正相关关系消失了。加入氮后,那些具有较低高度比例指数的物种的相对丰度增加,从而降低了群落加权平均数和高度比例指数的分散,最终降低了物种的丰富度。