Spatial Variability in Light Yields Colimitation of Primary Production by Both Light and Nutrients in a Forested Stream Ecosystem
Spatial Variability in Light Yields Colimitation of Primary Production by Both Light and Nutrients in a Forested Stream Ecosystem
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森林溪流生态系统中光产量的空间变异对光和养分初级生产的限制
DOI：
10.1007/s10021-016-0024-9
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Bechtold, Heather A.
中科院分区：
文献类型：
--
作者：
Warren, Dana R.;Collins, Sarah M.;Purvis, Emily M.;Kaylor, Matthew J.;Bechtold, Heather A.
初级生产的共同模仿日益被认为是水生和陆地生态系统的一个主导过程。在溪流中，营养物质的有效性和光的有效性已被证明是独立的限制初级生产，但colimitation的光和营养物质很少被考虑。我们使用了一系列的营养扩散基质（NDS）的生物测定部署在一个单一的研究流在两个夏天的光可用性条件的范围内，以确定底栖附着生物的限制因素从光过渡到营养的光水平。溪流附着生物的增加在高光斑块中是营养限制的，在低光斑块中是光限制的，当日光通量超过3.5 mol m-2day-1时，从主要的光限制转变为主要的营养限制。我们量化的光在每个NDS生物测定的位置，并在5米的间隔，在我们的两个相邻的160米的研究达到一个在结构复杂的古老的河岸森林和一个接壤的更均匀的第二次生长的森林。虽然这两个河段总体上是有限的，资源（光或养分）的主导限制不同的两个河岸林年龄/结构条件。在旧的增长部分，约四分之三的范围主要是营养有限的，而在第二次增长达到只有约四分之一的河床营养有限。在这条流，colimitation底栖附着生物的收益，由光和营养物质在河段尺度是一个新兴的属性的生态系统，表现为河岸森林结构的高度异质性的结果。
Colimitation of primary production is increasingly recognized as a dominant process across aquatic and terrestrial ecosystems. In streams, both nutrient availability and light availability have been shown to independently limit primary production, but colimitation by both light and nutrients is rarely considered. We used a series of nutrient-diffusing substrates (NDS) bioassays deployed across a range of light availability conditions in a single-study stream over two summers to determine the light level at which the limiting factor for benthic periphyton accrual transitioned from light to nutrients. Stream periphyton accrual was nutrient-limited in high-light patches, and light-limited in low-light patches, with the transition from being predominantly light-limited to being predominantly nutrient-limited occurring when daily light fluxes exceeded 3.5 mol m−2day−1. We quantified light at each NDS bioassay location and at 5 m intervals throughout our two adjacent 160 m study reaches—one in structurally complex old-growth riparian forest and one bordered by more uniform second-growth forest. Although both reaches were colimited overall, the resource (light or nutrients) dominating limitation differed between the two riparian forest age/structure conditions. In the old-growth section, about three quarters of the reach was predominantly nutrient-limited, whereas in the second-growth reach only about a quarter of the streambed was nutrient-limited. In this stream, colimitation of benthic periphyton accrual by light and nutrients at the reach scale was an emergent property of the ecosystem that manifested as a result of high heterogeneity in riparian forest structure.
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爱达荷州溪流附生植物的养分限制：养分扩散基质实验的结果
影响因子：
--
作者：
B. Sanderson;H. J. Coe;C. Tran;K. Macneale;Deborah L. Harstad;Adam B. Goodwin
通讯作者：
Adam B. Goodwin
影响因子：
2.7
作者：
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D. Schiller;E. Martí;J. Riera;F. Sabater
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DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
D. Warren;E. Bernhardt;R. Hall;G. Likens
通讯作者：
G. Likens
影响因子：
6.1
作者：
FISHER, SG;GRAY, LJ;BUSCH, DE
通讯作者：
BUSCH, DE
DOI：
10.1111/j.1752-1688.2007.00103.x
发表时间：
2007-10-01
影响因子：
2.4
作者：
Carey, Richard O.;Vellidis, George;Pringle, Catherine M.
通讯作者：
Pringle, Catherine M.