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土壤有机碳和土壤聚合物的稳定性对洛斯高原土地利用模式变化的反应

Zhandong Pan^1,2, Xuemei Cai², Yongming Bo³

¹College of Forestry, Gansu Agricultural University, Lanzhou, 730070, China.

Scientific reports

|December 31, 2024

概括

在洛斯高原,将农田转化为森林和草原,大大改善了土壤结构和土壤有机碳 (SOC) 含量. 增加森林和草原面积可以提高土壤总体的稳定性和碳储存,这对土地管理至关重要.

科学领域:

土壤科学土壤科学
生态生态学生态生态学
环境科学环境科学

背景情况:

土地利用变化对土壤聚合物动态和土壤有机碳 (SOC) 分布有深远影响.
对这些变化的研究,特别是从农田到中国洛斯高原的森林和草原,是有限的.
了解这些变化对于土壤健康和碳捕集策略至关重要.

研究的目的:

为了研究不同土地使用模式的土壤聚合物分布,聚合物稳定性和SOC含量的变化.
为了比较农田和转型森林/草原生态系统之间的这些参数.
为优化土地利用提供见解,以改善洛斯高原的土壤质量和碳储存.

主要方法:

在洛斯高原上选择了六种具有相似地理特征的土地使用模式:农田 (FL),废弃耕地 (ACL),Medicago sativa (MS),自然草原 (NG),Picea asperata Mast. (PA),以及Platycladus orientalis (L.) Franco (PO). 这两种类型的植物都被发现.
从0-10厘米,10-30厘米和30-50厘米的深度收集未被干扰的土壤样本.
分析了土壤中的聚合物分布,聚合物稳定性 (MWD,GMD) 和土壤中的 SOC 含量以及不同聚合物分数.

主要成果:

从FL转换为森林和草原,显著增加了宏积分含量 (> 20095毫米),平均重量直径 (MWD) 和几何平均直径 (GMD),同时减少了微积分含量 (< 20090.25毫米).
与FL相比,在大多数转型土地上,散土和聚石中的SOC含量显著增加,物种之间存在显著差异 (PA,NG,MS,PO,ACL).
MWD和GMD与土壤和堆积物中的SOC含量呈正相关性,表明改善的土壤结构可以增强碳储存.

结论:

在洛斯高原,将农田转化为森林 (PO,PA) 和草原 (NG) 显著改善了土壤结构,增加了SOC含量.
建议在土地利用规划中增加森林和草原的比例,以改善土壤碳储存和质量.
该研究为评估洛斯高原各种土地使用场景下的土壤有机碳动态提供了科学基础.

关键词:

土地使用模式.洛斯高原 (Loess Plateau) 是一个高原.返回森林和草原的土地.土壤聚合物的稳定性土壤聚合物的稳定性土壤有机碳土壤有机碳

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