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土地使用变化的影响分子组成和有机物质度在Oxisol中的影响

Zongtang Yang¹, Tsutomu Ohno², Balwant Singh¹

¹School of Life and Environmental Sciences, Faculty of Science, University of Sydney, Sydney, New South Wales 2015, Australia.

Environmental science & technology

|May 28, 2024

概括

将本地植被转化为耕地改变了土壤有机物 (SOM) 的数量,但不是其分子组成. 关键的SOM分数,如有机金属复合物和短程有序氧化物,稳定土壤有机碳.

科学领域:

土壤科学土壤科学
有机地化学有机地化学
环境科学环境科学

背景情况:

土地利用变化对土壤有机物质 (SOM) 的数量和质量产生重大影响.
土地利用变化对SOM化学成分的具体影响仍然不完全理解.

研究的目的:

调查土地利用变化如何从本地植被到作物种植影响不同土壤有机物 (SOM) 分数的分子组成.
确定土地利用变化对与各种矿物阶段相关的SOM的影响.

主要方法:

连续的化学提取将SOM分为水溶性 (W),有机金属复合物 (PP),短距离有序 (SRO) 氧化物 (HH) 和水井结晶氧化物 (DH) 分数.
里叶变换离子循环子共振质谱法 (FT-ICR-MS) 用于分析SOM分量的分子组成.
来自本土植被和收割的Oxisols的SOM分数的比较.

主要成果:

有机金属复合物 (PP) 和短程有序 (SRO) 氧化物 (HH) 分数含有更多的有机物质,表明它们在SOM稳定中的作用.
在PP和HH分数中,类和类化合物占主导地位,而类化合物则占据了水井晶体氧化物 (DH) 分数的主导地位.
土地使用变化改变了SOM分量的度,但对与不同矿物相相关的SOM分子组成的影响很小.

结论:

土壤有机物 (SOM) 分数的分子组成在很大程度上保持不变,尽管土地利用从本土植被转换为作物.
没有观察到特定有机碳化合物的显著选择性损失或保存,这表明SOM的整体化学结构对这种类型的土地用途变化具有弹性.

关键词:

在FT-ICR-MS中使用.土地使用变化土地使用变化与矿物质相关的有机物质.有机金属复合体有机金属复合体顺序提取的一次性提取.短距离订购矿物质的短距离订购矿物质.土壤有机物质土壤有机物质.矿井结晶矿物质是非常重要的.

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