Biodegradation and Photodegradation of Vegetation-Derived Dissolved Organic Matter in Tidal Marsh Ecosystems
Biodegradation and Photodegradation of Vegetation-Derived Dissolved Organic Matter in Tidal Marsh Ecosystems
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潮汐沼泽生态系统中植被溶解有机物的生物降解和光降解
DOI：
10.1007/s12237-021-00982-7
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发表时间：
2021
影响因子：
2.7
通讯作者：
Tzortziou, Maria
中科院分区：
文献类型：
--
作者：
Shelton, Sydney;Neale, Patrick;Pinsonneault, Andrew;Tzortziou, Maria
潮汐湿地是沿海生态系统溶解有机质(DOM)的重要来源，对营养循环、光照、碳动态、浮游植物活动、微生物生长和生态系统生产力都有影响。关于DOM的性质和来源的研究很多，但对潮汐湿地植物来源的DOM的特性和降解知之甚少。通过对切萨皮克湾湿地新鲜植物和衰老植物的渗滤液进行微生物和联合紫外线照射和微生物培养实验，结果表明，衰老材料比新鲜材料淋失了更多的溶解有机碳(分别为77.9 ± 54.3vs21.6 ± 11.8mgDOC L−1)。降解遵循指数衰减规律，老化材料平均可生物降解有机碳(% )为50.5BDOC± 9.45%，即微生物降解造成的有机碳损失。相比之下，新鲜材料的平均BDOC值较大(72.6BDOC± 19.2%)。吸光度的残留百分比(新鲜的83.3DOC± 26.7%，衰老的90.1DOC± 10.8%)大于DOC的残留百分比，说明有色DOM的生物利用度低于无色材料。不同物种淋溶的DOC、%BDOC和SUVA280的浓度不同，表明沼泽的物种组成可能会影响输出DOC的数量和质量。比较UV + 微生物和纯微生物培养，没有发现任何明显的影响%BDOC，但紫外线暴露增加了在随后的黑暗培养期间的吸光度损失。这些结果表明，衰老对潮汐湿地植物淋洗出的DOM的质量和浓度产生了影响，微生物与紫外线的结合对DOM的降解的影响不同于单独的微生物。
Tidal wetlands are a significant source of dissolved organic matter (DOM) to coastal ecosystems, which impacts nutrient cycling, light exposure, carbon dynamics, phytoplankton activity, microbial growth, and ecosystem productivity. There is a wide variety of research on the properties and sources of DOM; however, little is known about the characteristics and degradation of DOM specifically sourced from tidal wetland plants. By conducting microbial and combined UV exposure and microbial incubation experiments of leachates from fresh and senescent plants in Chesapeake Bay wetlands, it was demonstrated that senescent material leached more dissolved organic carbon (DOC) than fresh material (77.9 ± 54.3 vs 21.6 ± 11.8 mg DOC L−1, respectively). Degradation followed an exponential decay pattern, and the senescent material averaged 50.5 ± 9.45% biodegradable DOC (%BDOC), or the loss of DOC due to microbial degradation. In comparison, the fresh material averaged a greater %BDOC (72.6 ± 19.2%). Percent remaining of absorbance (83.3 ± 26.7% for fresh, 90.1 ± 10.8% for senescent) was greater than percent remaining DOC, indicating that colored DOM is less bioavailable than non-colored material. Concentrations of DOC leached, %BDOC, and SUVA280 varied between species, indicating that the species composition of the marsh likely impacts the quantity and quality of exported DOC. Comparing the UV + microbial to the microbial only incubations did not reveal any clear effects on %BDOC but UV exposure enhanced loss of absorbance during subsequent dark incubation. These results demonstrate the impacts of senescence on the quality and concentration of DOM leached from tidal wetland plants, and that microbes combined with UV impact the degradation of this DOM differently from microbes alone.
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咸水、潮汐沼泽-河口界面荧光溶解有机物的时间变化
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
A. Menendez
通讯作者：
A. Menendez
影响因子：
2.5
作者：
M. Tzortziou;P. Neale;J. Megonigal;Crystal Lee Pow;M. Butterworth
通讯作者：
M. Tzortziou;P. Neale;J. Megonigal;Crystal Lee Pow;M. Butterworth
影响因子：
4.5
作者：
M. Tzortziou;P. Neale;Christopher L. Osburn;J. Megonigal;N. Maie;Rudolf JaffÉ
通讯作者：
M. Tzortziou;P. Neale;Christopher L. Osburn;J. Megonigal;N. Maie;Rudolf JaffÉ
影响因子：
2.7
作者：
CURTIS, PS;DRAKE, BG;WHIGHAM, DF
通讯作者：
WHIGHAM, DF
影响因子：
3.6
作者：
MEYER, JL;EDWARDS, RT;RISLEY, R
通讯作者：
RISLEY, R