Effects of phosphorus enrichment on the spatial heterogeneity of stream periphyton under uneven light conditions
Effects of phosphorus enrichment on the spatial heterogeneity of stream periphyton under uneven light conditions
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光照不均匀条件下磷富集对河流附生植物空间异质性的影响
DOI：
10.1007/s10750-021-04591-0
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发表时间：
2021
期刊：
影响因子：
2.6
通讯作者：
Patrick Fink
中科院分区：
文献类型：
--
作者：
Alessandra Iannino;Alexander T.L. Vosshage;Markus Weitere;Patrick Fink
光照和养分的空间变化通常导致溪流内附着生物生物量的异质性分布，但养分富集对附着生物异质性的影响仍然知之甚少。我们测试了磷富集的影响，在不均匀的光照条件下的环境中的附生生物的数量和营养质量的异质性。在半阴半光的圆形流水槽中，研究了高磷和低磷条件下自然附着生物的生长情况。3周后，附着生物的生物量显着更异质性高P比在低P供应，藻类产量增加，只有在P-丰富的治疗与光。然而，尽管每个实验水槽内的光照存在差异，但两种P处理中附着生物C：P比同样均匀。虽然这一结果似乎与光：营养假说相反，它很可能是高数量的附着生物补丁获得更多的P和耗尽可用的P为低数量的补丁，导致每个水槽内甚至C：P比。因此，在异质性光可用性的环境中，营养富集有可能增加附着生物数量的异质性，而不影响附着生物质量的异质性，由于附着生物斑块不是相互独立的。
Spatial variations in light and nutrient availability usually lead to a heterogeneous distribution of periphyton biomass within streams, but the effects of nutrient enrichment on periphyton heterogeneity are still poorly understood. We tested phosphorus enrichment effects on the heterogeneity of periphyton quantity and nutritional quality in an environment with uneven light conditions. Natural periphyton was grown at either high or low P supply in circular running water flumes, each of which was half shaded and half in light. After 3 weeks, periphyton biomass was significantly more heterogeneous at high P than at low P supply, as algal production increased with light only in the P-enriched treatment. However, periphyton C:P ratio was equally homogeneous in both P treatments, despite the light differences within each experimental flume. Although this outcome seems to contrast with the light:nutrient hypothesis, it is likely that high-quantity periphyton patches acquired more P and depleted the available P for the low-quantity patches, leading to an even C:P ratio within each flume. Therefore, in an environment with heterogeneous light availability, nutrient enrichment has the potential to increase the heterogeneity of periphyton quantity without affecting the heterogeneity of periphyton quality, due to periphyton patches not being independent of one another.
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