| 摘要: |
| 为揭示中亚热带地区不同林型土壤碳（C）、氮（N）和磷（P）含量及化学计量特征差异，明确不同林型土壤养分限制程度。本研究以广东省肇庆市怀集三岳省级自然保护区次生林、杉木林（Cunninghamia lanceolata）、木荷杉木混交林（Schima superba and Cunninghamia lanceolata）和秃杉林（Taiwania cryptomerioides）四种林型为研究对象，测定0-10、10-20和20-40 cm土层土壤CNP含量并分析化学计量特征，通过主成分分析探讨其主要影响因素。结果显示：土壤有机碳（SOC）、全氮（TN）和全磷（TP）的含量在四种林型中的变化范围为11.60-27.01、0.78-2.30和0.199-0.405 g·kg-1，其中TP在林型间差异显著，表现为次生林 > 杉木林 > 木荷杉木混交林 > 秃杉林；SOC、TN和TP总体随土层深度增加而降低。土壤C:N、C:P和N:P在四种林型中的变化范围为11.67-17.80、13.36-133.18和2.96-8.44，其中C:N和C:P在林型间差异显著，C:N表现为杉木林 > 秃杉林 > 木荷杉木混交林 > 次生林、C:P表现为秃杉林 > 木荷杉木混交林 > 杉木林 > 次生林；随土层深度的增加，土壤C:N在不同林型中变化各异，其中次生林呈现先增后减趋势、杉木林和木荷杉木混交林则随土壤深度的增加而增加、秃杉林反之，C:P与N:P随土壤深度的增加而显著降低。主成分分析显示，土壤CNP含量及其化学计量特征的主要影响因素是土壤含水率（SWC）与可溶性有机氮（DON）。综上，中亚热带地区不同林型土壤养分及化学计量特征存在显著差异，其中次生林养分含量较高，杉木林和秃杉林分别受N和P限制最严重；受土壤SWC和DON的影响，四种林型整体呈现低N和低P的土壤养分格局。 |
| 关键词: 林型差异 中亚热带森林 化学计量特征 土壤碳氮磷 养分限制 |
| DOI： |
| 投稿时间：2026-06-15修订日期：2026-07-01 |
| 基金项目:国家自然科学基金项目（32322054；32271644）；广东怀集三岳省级自然保护区植物多样性固定样方样线监测项目（E541010011） |
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| Soil Carbon, Nitrogen, and Phosphorus Contents and Stoichiometric Characteristics across Different Forest Types in a Mid-Subtropical Region |
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WEN Wen1, REN Qiaohui2, SUN Zhenfeng2, SONG Chenghao2, LI Shuangjiang2, HUANG Ailian1, TAN Ying1, YAO Huaisheng1, TIAN Huixia2, HOU Enqing3
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| (1.Administration of Guangdong Huaiji Sanyue Provincial Nature Reserve,Huaiji Guangdong;2.College of Environment and Resources,Taiyuan University of Science and Technology,Taiyuan Shanxi;3.Guangdong Provincial Key Laboratory of Applied Botany,South China Botanical Garden of Chinese Academy of Sciences) |
| Abstract: |
| To examine differences in soil carbon (C), nitrogen (N), and phosphorus (P) contents and stoichiometric characteristics among different forest types in a mid-subtropical region and to identify their potential nutrient limitations, this study investigated four forest types in Huaiji Sanyue Provincial Nature Reserve, Zhaoqing, Guangdong Province: secondary forest, Cunninghamia lanceolata forest, Schima superba and Cunninghamia lanceolata mixed forest, and Taiwania cryptomerioides forest. Soil C, N, and P contents and their stoichiometric ratios were determined in the 0-10, 10-20, and 20-40 cm soil layers, and the main influencing factors were explored using principal component analysis. The results showed that soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) contents across the four forest types ranged from 11.60 to 27.01, 0.78 to 2.30, and 0.199 to 0.405 g·kg-1, respectively. Among them, TP differed significantly among forest types, decreasing in the order of secondary forest > Cunninghamia lanceolata forest > Schima superba and Cunninghamia lanceolata mixed forest > Taiwania cryptomerioides forest. Overall, SOC, TN, and TP decreased with increasing soil depth. Soil C:N, C:P, and N:P ratios ranged from 11.67 to 17.80, 13.36 to 133.18, and 2.96 to 8.44, respectively. C:N and C:P differed significantly among forest types. C:N decreased in the order of Cunninghamia lanceolata forest > Taiwania cryptomerioides forest > Schima superba and Cunninghamia lanceolata mixed forest > secondary forest, whereas C:P decreased in the order of Taiwania cryptomerioides forest > Schima superba and Cunninghamia lanceolata mixed forest > Cunninghamia lanceolata forest > secondary forest. With increasing soil depth, C:N showed different patterns among forest types, whereas C:P and N:P decreased significantly. Principal component analysis showed that soil water content (SWC) and dissolved organic nitrogen (DON) were key factors influencing soil C, N, and P contents and their stoichiometric characteristics. Overall, soil nutrient contents and stoichiometric characteristics differed among forest types in this mid-subtropical region. The secondary forest had relatively higher soil nutrient contents, whereas the Cunninghamia lanceolata forest and Taiwania cryptomerioides forest showed the strongest N and P limitations, respectively. Under the influe |
| Key words: Forest type difference, Subtropical forest, Stoichiometric characteristics, Soil carbon, nitrogen and phosphorus, Nutrient limitation. |
