| 摘要: |
| 为评估城市化背景下不同林分土壤质量和养分含量, 文章以广东省樟木头林场的针阔混交林和
阔叶林为研究对象, 测定 2 种林分 1 m 深剖面 (分 0 ~ 20、 20 ~ 40、 40 ~ 60、 60 ~ 80 和 80 ~ 100 cm 共 5 个
土层) 土壤的物理和化学指标, 评估 2 种林分土壤物理特性、 碳氮磷及其化学计量特征, 并分析影响土
壤有机碳含量的因素。 结果发现, (1) 针阔混交林土壤的总孔隙度和非毛管孔隙度显著高于阔叶林 (P<
0. 05), 分别高 4. 15% ~15. 81%和 5. 22% ~ 87. 70%, 且土壤容重和自然含水量也存在显著的林分差异;
(2) 阔叶林土壤 pH 值、 土壤全磷、 全钾和速效钾均显著高于针阔混交林 (P<0. 05); 阔叶林 0~20 cm 土
层土壤有机碳含量显著高于针阔混交林 (69. 49%, P<0. 05), 其他各土层土壤有机碳含量在 2 种林分之
间差异不显著; (3) 针阔混交林土壤碳磷比和氮磷比显著高于阔叶林 (P<0. 05), 说明针阔混交林土壤
磷素供应水平更低; (4) 针阔混交林底层土壤 (20 ~ 100 cm) 有机碳与有效磷含量呈显著正相关, 而阔
叶林底层土壤有机碳与土壤 pH 值呈显著负相关, 表层 (0~20 cm) 土壤有机碳与非毛管孔隙度呈显著正
相关。 因此, 在未来森林经营管理中, 应注意对土壤氮磷钾供应的补充, 以促进森林的正向演替和提高森
林的碳汇潜力。 |
| 关键词: 土壤有机碳 化学计量比 针阔混交林 阔叶林 土壤养分 |
| DOI： |
| 分类号: |
| 基金项目:广东林业生态监测网络平台建设项目 (2023KYXM09), 广东省林业科技创新项目 (2022KJCX017)。 |
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| Effect of Different Forest Stand Types on Soil Physicochemical Properties and Nutrient Contents in Zhangmutou, Dongguan City |
|
Jun Liu1, Linna Xiong1, Yongxian Zhao1, Fengling Cai1, Qifeng Mo2
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1.Zhangmutou Forest Farm of Guangdong,Dongguan;2.College of Forestry and Landscape Architecture,South China Agricultural University
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| Abstract: |
| To evaluate the soil quality and nutrient conditions of different forest stands under urbanization,
this study investigated the coniferous broad -leaved mixed forest (CBMF) and broad -leaved forest (BF) in
Zhangmutou Forest Farm, Guangdong Province. The physical and chemical properties of soil profile (0-20,
20-40, 40-60, 60-80, and 80-100 cm) from the two stands were measured. The study assessed the soil physical properties, the contents of carbon, nitrogen, and phosphorus, their stoichiometric characteristics, and
analyzed the influencing factors of soil organic carbon (SOC). The results showed that (1) the total porosity
and non-capillary porosity of the soil in the CBMF were significantly higher than those in the BF (P<0. 05), by
4. 15%- 15. 81% and 5. 22% - 87. 70%, respectively. The soil bulk density and natural water content also
showed significant differences between the two stands. (2) The soil pH, total phosphorus, total potassium and
available potassium in the BF were significantly higher than those in CBMF (P<0. 05). The SOC content in the
0-20 cm soil layer of the BF was significantly higher than that of the CBMF (69. 49%, P<0. 05), while the
SOC content in other soil layers showed no significant difference between the stands. (3) The soil C/ P, N / P
ratio in the CBMF were significantly higher than those in the BF (P<0. 05), indicating a lower phosphorus supply level in the CBMF soil. (4) In the CBMF, SOC content in the subsoil (20-100 cm) was significantly positively correlated with available phosphorus. In the BF, SOC content in the subsoil was significantly negatively
correlated with soil pH, while in the topsoil (0-20 cm) it was significantly positively correlated with non-capillary porosity. Therefore, in future forest management, attention should be paid to supplementing soil nitrogen,
phosphorus and potassium supplies to promote forest succession and enhance forest carbon sink potential. |
| Key words: soil organic carbon stoichiometry coniferous broad - leaved mixed forest broad - leaved forest soil nutrient |
