State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, China; Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Zhejiang A&F University, Lin'an, 311300, China.
State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, China.
J Environ Manage. 2021 Jul 1;289:112483. doi: 10.1016/j.jenvman.2021.112483. Epub 2021 Mar 31.
Soil organic carbon (SOC) and total nitrogen (STN) are crucial soil quality indicators in a forest ecosystem. Their cycling processes and interactions have a key impact on the plants productivity, potential carbon sequestration and stability of the terrestrial ecosystem. In this study, soil profile samples (0-100 cm) were collected from 906 plots of typical subtropical forest in Zhejiang Province, southeastern China. Moran's I, geostatistics and geographic information system (GIS) techniques were used to study the vertical and horizontal heterogeneity of SOC, STN and C:N ratio. The results indicated that the contents of SOC and STN clearly decreased with the soil depth increasing (from 0 to 10 cm layer to 60-100 cm layer). The spatial distributions of SOC and STN were consistent with the topography, showing a decreasing trend from southwest to northeast of Zhejiang Province. The results of ANOVA and correlation analyses indicated that the dominant tree species, elevation and Normalized Difference Vegetation Index (NDVI) were the key factors affecting SOC and STN contents. For the total 0-100 cm soil layer, the mean densities of SOC and STN were 108.53 Mg ha and 0.08 Mg ha, respectively. The total stocks of SOC and STN were 877.19 Tg and 84.42 Tg. Approximately 65% SOC and 45% STN were belonged to the upper 30 cm soil layer, which was strongly related to the actual soil thickness. The results could provide critical information for forestry and environmental management related to C and N accumulations in subtropical forests of China.
土壤有机碳（SOC）和总氮（STN）是森林生态系统中重要的土壤质量指标。它们的循环过程和相互作用对植物生产力、潜在碳固存以及陆地生态系统的稳定性具有关键影响。本研究采集了中国东南部浙江省典型亚热带森林的 906 个样地的土壤剖面样品（0-100cm）。采用 Moran's I、地统计学和地理信息系统（GIS）技术研究了 SOC、STN 和 C:N 比的垂直和水平异质性。结果表明，SOC 和 STN 的含量随土壤深度的增加（从 0-10cm 层到 60-100cm 层）明显降低。SOC 和 STN 的空间分布与地形一致，呈现出从浙江省西南向东北逐渐减少的趋势。方差分析和相关分析的结果表明，优势树种、海拔和归一化差异植被指数（NDVI）是影响 SOC 和 STN 含量的关键因素。对于整个 0-100cm 土壤层，SOC 和 STN 的平均密度分别为 108.53Mg ha 和 0.08Mg ha。SOC 和 STN 的总储量分别为 877.19Tg 和 84.42Tg。大约 65%的 SOC 和 45%的 STN 属于上层 30cm 土壤层，与实际土壤厚度密切相关。研究结果可为中国亚热带森林碳和氮积累的林业和环境管理提供重要信息。
