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溶解和有机颗粒物的来源,组成和分子多样性因热带沿海主流的沿海土地使用而有所不同

Hengkuan Ji¹, Hua Wang², Zhipeng Wu¹

¹School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China.

The Science of the total environment

|November 16, 2023

概括

土地使用显著改变溪流中的有机物质 (OM),影响其分子构成和多样性. 农业增加了陆地OM,而森林增加了生物活性化合物,影响了河流生态系统和管理策略.

科学领域:

环境化学环境化学
有机地化学有机地化学
生态生态学生态生态学

背景情况:

有机物 (OM),包括溶解物 (DOM) 和颗粒物 (POM),对于水生生态系统的功能至关重要.
沿海土地使用是OM特征的关键驱动因素,影响其反应能力和命运.
了解土地利用如何塑造OM来源,组成和分子多样性对于水资源管理至关重要.

研究的目的:

调查河岸土地利用对河流中POM和HDOM的来源,组成和分子多样性的影响.
阐明土地利用,土壤特性,水生微生物和OM特征之间的关系.
为预测OM行为提供见解,并在变化的热带沿海地区制定管理策略.

主要方法:

应用多种光谱和质谱技术来分析POM和HDOM.
利用结构方程建模 (SEM) 来评估土壤衍生的DOM (SDOM) 对OM的影响.
雇员冗余分析 (RDA) 以将OM组成与微生物群落和SDOM属性相关联.

主要成果:

在土地使用中,POM表现出比HDOM更高的各族特征和更低的分子多样性.
农业主流表现出更多的陆地OM与缩的芳/,而森林主流有更多的生物可变性脂质,蛋白质和碳水化合物.
SDOM显著影响了POM源/组成和HDOM源;水生微生物主要控制了HDOM的组成和多样性.

结论:

岸边的土地利用明显地塑造了河流有机物质的分子特征和多样性.
在不同的土地使用场景下,特定的微生物群落和SDOM属性与OM组成有关.
调查结果有助于预测OM命运,并为热带沿海水生系统的有效管理提供信息.

关键词:

溶解的有机物质是有机物质.在FT-ICR-MS中使用.头部水源流是一个流.土地使用情况土地使用情况分子组成和多样性.有机物颗粒物有机物颗粒物有机物

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相关概念视频

What is an Ecosystem?

What is an Ecosystem?

What are Biogeochemical Cycles?

What are Biogeochemical Cycles?

The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.