Global Patterns and Controls of Nutrient Immobilization on Decomposing Cellulose in Riverine Ecosystems
Global Patterns and Controls of Nutrient Immobilization on Decomposing Cellulose in Riverine Ecosystems
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河流生态系统中分解纤维素养分固定化的总体模式和控制
DOI：
10.1029/2021gb007163
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发表时间：
2022
影响因子：
5.2
通讯作者：
Halvorson, Halvor M.
中科院分区：
文献类型：
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作者：
Costello, David M.;Tiegs, Scott D.;Boyero, Luz;Canhoto, Cristina;Capps, Krista A.;Danger, Michael;Frost, Paul C.;Gessner, Mark O.;Griffiths, Natalie A.;Halvorson, Halvor M.
微生物在植物凋落物的分解中起着关键作用，并影响河流和河岸带中碳的命运。在分解低营养植物凋落物时，微生物从环境中获取氮(N)和磷(P)(即营养固定)，这一过程对养分负荷和气候变化潜在敏感。尽管如此，对固定化的环境控制知之甚少，因为固定化率也受到植物凋落物化学的影响，而植物凋落物化学与相同的环境因素相耦合。在这里，我们使用了标准化的低营养有机物质底物(棉条)来量化代表全球11个生物群的100个成对溪流和河岸地点的养分固定情况。固定化速率变化三个数量级，河流中的固定化速率大于河岸带，并且与分解速率密切相关。在河流中，磷的固定化速率受地表水磷酸盐浓度的控制，而氮的固定化速率与无机氮无关。尽管地表水N：P的变化很大，但固定营养盐的N：P严格限制在10：1的摩尔比范围内。然而，在河流中，营养物质的供应最终控制着微生物在给定温度下能否达到预期的最大分解速度。综上所述，我们证明了外源养分供应和固定化是有机物分解的关键控制点。
Microbes play a critical role in plant litter decomposition and influence the fate of carbon in rivers and riparian zones. When decomposing low‐nutrient plant litter, microbes acquire nitrogen (N) and phosphorus (P) from the environment (i.e., nutrient immobilization), and this process is potentially sensitive to nutrient loading and changing climate. Nonetheless, environmental controls on immobilization are poorly understood because rates are also influenced by plant litter chemistry, which is coupled to the same environmental factors. Here we used a standardized, low‐nutrient organic matter substrate (cotton strips) to quantify nutrient immobilization at 100 paired stream and riparian sites representing 11 biomes worldwide. Immobilization rates varied by three orders of magnitude, were greater in rivers than riparian zones, and were strongly correlated to decomposition rates. In rivers, P immobilization rates were controlled by surface water phosphate concentrations, but N immobilization rates were not related to inorganic N. The N:P of immobilized nutrients was tightly constrained to a molar ratio of 10:1 despite wide variation in surface water N:P. Immobilization rates were temperature‐dependent in riparian zones but not related to temperature in rivers. However, in rivers nutrient supply ultimately controlled whether microbes could achieve the maximum expected decomposition rate at a given temperature. Collectively, we demonstrated that exogenous nutrient supply and immobilization are critical control points for decomposition of organic matter.
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木质素和氮对贫营养生态系统中凋落物分解的影响 - 一种理论方法
DOI：
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发表时间：
1987
期刊：
影响因子：
--
作者：
F. Berendse;B. Berg;E. Bosatta
通讯作者：
E. Bosatta
墨西哥西北部古老热带干燥森林的凋落物产量和气象数据
影响因子：
1.2
作者：
Ana M. Velez;Lucia Nevescanin;Martha L. Vargas;Ana R. Flores;Juan C. Álvarez‐Yépiz;E. Yépez
通讯作者：
E. Yépez
影响因子：
--
作者：
J. Pozo;E. González;J. Díez;J. Molinero;A. Elósegui
通讯作者：
A. Elósegui
影响因子：
1.7
作者：
A. Martínez;Silvia Núñez;Haydeé Miranda;A. Búrquez
通讯作者：
A. Búrquez
外源氮和底物来源的氮对于叶片分解过程中微生物生长的相对重要性。
影响因子：
4.8
作者：
B. Cheever;Jackson R. Webster;E. E. Bilger;Steven A. Thomas
通讯作者：
Steven A. Thomas