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不同盐度的土壤中的矿化和二氧化碳排放

Cailing Shi¹, Jing Zhang^2,3, Haibo Zhang²

¹School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China. xwjeric@163.com.

Environmental science. Processes & impacts

|February 28, 2025

概括

将草添加到盐土中可以减少草矿化和化效应 (PE),并增加盐度. 更高的盐度也加速了峰值草矿化和PE,影响了土壤的碳捕集潜力.

科学领域:

土壤科学土壤科学
环境科学环境科学
生物地质化学生物地质化学

背景情况:

应用草是盐水土壤回收的常见做法.
了解盐土壤中的草矿化和原始化效应 (PE) 对土壤健康和碳捕获至关重要.
不同盐度对这些过程的影响在很大程度上仍未被描述.

研究的目的:

研究不同土壤盐度水平对草矿化和二氧化碳排放的影响.
在不同的盐度条件下,通过添加草来量化原始化效应 (PE).
评估对盐土中碳捕集的影响.

主要方法:

一个180天的化实验使用13C标记的玉米草.
确定了四个盐度水平:3.0克公斤-1 (BS),5.0克公斤-1 (LS),10.0克公斤-1 (MS) 和15.0克公斤-1 (HS).
在土壤中添加了5.0%的,并监测了二氧化碳排放.

主要成果:

的矿化率和潜在的矿化随着盐度的增加而显著下降.
累计CO2排放和PE排放分别减少3.6%-26.8%和3.4%-26.5%,与基线相比,盐度较高的土壤.
盐度的增加加快了草矿化和PE峰值的时间,并延长了草对土壤有机物矿化影响的持续时间.

结论:

土壤盐度显著影响了草矿化率和相关的二氧化碳排放.
虽然高盐度减少了整体矿化和PE,但它延长了草对土壤有机物影响的持续时间.
结果为优化草应用在盐水环境中的碳捕获提供了洞察力.

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