[不同添加对土壤性的有机碳和温带森林中的环境因素及其相互作用的影响]
Han Zhao1, Tian Zuo1, Jing-Wen Diao1
1College of Food and Biology, Hebei University of Science and Technology, Shijiazhuang 050018, China.
Huan jing ke xue= Huanjing kexue
|January 14, 2026
概括
不同的化肥对土壤有机碳 (LOC) 有显著影响. 化导致易氧化碳 (EOC) 和溶解有机碳 (DOC) 减少最多,这凸显了在沉积研究中考虑类型的重要性.
科学领域:
- 土壤科学 土壤科学
- 环境化学环境化学
- 生物地质化学生物地质化学
背景情况:
- 不稳定有机碳 (LOC) 成分,包括易氧化碳 (EOC) 和溶解有机碳 (DOC),是土壤环境变化的敏感指标.
- 众所周知,大气中 (N) 沉积会影响土壤的 LOC,但不同类型的 N 肥料的具体影响仍然不太清楚.
研究的目的:
- 为了比较四种不同的 (N) 肥料 (酸盐,酸,化和尿素) 对土壤不稳定成分 (LOC) 的影响.
- 研究这些N肥料对土壤物理化学性质和细胞外酶活性的影响.
- 根据不同的N加法场景,确定影响LOC分配变化的关键因素.
主要方法:
- 在温带森林土壤上进行了一项为期四年的实地实验,每年应用于酸盐,酸,化和尿素的10 g·(m2·a) -1.1.
- 测量了土壤的LOC (EOC,DOC),总有机碳 (TOC),物理化学性质 (pH,总) 和细胞外酶活性 (逆转酶,β-葡萄糖酶).
- 采用随机森林模型来确定影响LOC分配的关键因素.
主要成果:
- 所有的N添加都显著降低了EOC和DOC含量以及它们在TOC中的比例 (P<0.05).
- 化在EOC/TOC (-80.0%) 和DOC/TOC (-69.8%) 中显示出最明显的减少,其次是酸. 酸和尿素的作用较小.
- 土壤pH值,总和逆转酶和β-葡萄糖酶的活动被确定为LOC变化的关键驱动因素,化导致土壤显著酸化和酶活性增加.
结论:
- 添加改变了土壤LOC的比例分配,但反应因N肥料类型而异.
- 观察到的LOC的下降与土壤pH值变化和增强的细胞外酶活动带来的加速分解有关,特别是在化和酸处理下.
- 准确评估和预测N沉积对土壤LOC的影响需要考虑所涉及的的特定化学形式.
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