| 紫柏山国家级自然保护区不同植被类型土壤碳氮分布特征及其影响因素 |
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| 引用本文： | 李华,蔡建军,巫翠华,张利利,袁岸,康永祥.紫柏山国家级自然保护区不同植被类型土壤碳氮分布特征及其影响因素[J].浙江农林大学学报,2021,38(3):485-493. |
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| 作者姓名： | 李华 蔡建军 巫翠华 张利利 袁岸 康永祥 |
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| 作者单位： | 1.西北农林科技大学 林学院，陕西 杨凌 7121002.凤县文化旅游产业管理委员会，陕西 凤县 721700 |
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| 基金项目： | “十三五”国家重点研发计划项目(2016YFC0501706-01)；紫柏山国家级自然保护区综合考察专项 |
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| 摘 要： | 目的 研究陕西省宝鸡市紫柏山国家级自然保护区不同植被类型下土壤碳氮分布特征，探讨其主要影响因素。 方法 以保护区内壤土类型(槲栎Quercus aliena林、华山松Pinus armandii林)和砂质土类型(锐齿栎Q. aliena var. acuteserrata林、栓皮栎Q. variabilis林、白桦Betula platyphylla林)不同土层土壤样品为研究对象，比较5种植被类型下土壤有机碳质量分数、全氮质量分数、土壤碳氮密度和土壤碳氮储量及碳氮比的差异，分析土壤有机碳、全氮、碳氮比与土壤理化性质的关系。 结果 ①壤土区土壤有机碳质量分数、全氮质量分数、土壤碳氮密度及土壤碳氮储量显著高于砂质土区(P＜0.05)，其中壤土区各土层从大到小表现为槲栎林、华山松林，砂质土区各土层从大到小表现为白桦林、锐齿栎林、栓皮栎林。②土壤有机碳质量分数、全氮质量分数、土壤碳氮密度及土壤碳氮储量在0~30 cm土层均随土层深度的增加而显著降低(P＜0.05)。③各植被类型不同土层的土壤碳氮比分布无明显规律且差异不显著，碳氮比为9.94~16.23，有机质的矿化能力较强。④土壤含水量、容重是影响土壤有机碳和全氮质量分数的主要因子，土壤含水量、pH是影响碳氮比的主要因子。 结论 不同植被类型下土壤有机碳质量分数、全氮质量分数、土壤碳氮密度及土壤碳氮储量存在显著差异(P＜0.05)，土壤含水量是影响土壤有机碳、全氮和碳氮比的关键因子。图4表5参36
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| 关 键 词： | 森林土壤学 紫柏山国家级自然保护区 植被类型 土壤类型 有机碳 全氮 |
| 收稿时间： | 2020-08-02 |
Distribution characteristics and influencing factors of soil carbon and nitrogen under different vegetation types in Zibaishan National Nature Reserve |
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| LI Hua,CAI Jianjun,WU Cuihua,ZHANG Lili,YUAN An,KANG Yongxiang.Distribution characteristics and influencing factors of soil carbon and nitrogen under different vegetation types in Zibaishan National Nature Reserve[J].Journal of Zhejiang A&F University,2021,38(3):485-493. |
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| Authors: | LI Hua CAI Jianjun WU Cuihua ZHANG Lili YUAN An KANG Yongxiang |
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| Affiliation: | 1.College of Forestry, Northwest A&F University, Yangling 712100, Shaanxi, China2.Fengxian Cultural Tourism Industry Management Committee, Fengxian 721700, Shaanxi, China |
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| Abstract: | Objective The objective of this study is to explore the distribution characteristics of soil carbon and nitrogen under different vegetation types in Zibaishan National Nature Reserve, and analyze its main influencing factors. Method Soil samples were collected from different soil layers, including loam types (Q. aliena forest and P. armandii forest) and sandy types (Q. aliena var. acuteserrata forest, Q. variabilis forest, B. platyphylla forest). The content, density and storage of soil organic carbon (SOC), total nitrogen (TN), and carbon-nitrogen ratio (C∶N) under 5 different vegetation types were compared, and the relationship between SOC, TN, C∶N and soil physical and chemical properties was analyzed. Result (1)The content, density and storage of SOC and TN in the loam soil were significantly higher than those in the sandy soil (P＜0.05). As for loam soil, Q. aliena forest had the largest content, density and storage of SOC and TN, followed by P. armandii forest. For sandy soil, the order from large to small was B. platyphylla forest, Q. aliena var. acuteserrata forest, and Q. variabilis forest. (2)With the increase of soil depth, the content, density and storage of SOC and TN in 0?30 cm soil layer decreased significantly (P＜0.05). (3)Soil C∶N in different soil layers of different vegetation types showed little regularity or differences. The value of C∶N was 9.94?16.23, indicating strong mineralization ability of organic matter. (4)Soil water content (SWC) and bulk density (BD) were the main factors affecting soil SOC and TN content, while SWC and pH were the main factors affecting C∶N. Conclusion There are significant differences in content, density and storage of SOC and TN under different vegetation types, and SWC is a key factor affecting SOC, TN and C∶N. This study has a certain reference value for the protection and management of forest ecosystem in the reserve. Ch, 4 fig. 5 tab. 36 ref.] |
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