林分类型和氮添加对亚热带森林土壤氧化亚氮排放的影响
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邓米林(1998-),男,湖南邵阳人,硕士研究生,主要从事土壤生态学研究。E-mail:1550342935@qq.com

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国家自然科学基金项目(42077041);福建省自然科学基金项目(2020J01187)


Effects of Forest Types and Nitrogen Addition on Soil Nitrous Oxide Emissions in a Subtropical Forest
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    摘要:

    为揭示亚热带森林土壤N2O排放对林分类型和氮添加的响应特征,选取位于福建省三明市的中亚热带米槠次生林、杉木人工林和马尾松人工林土壤为研究对象,分别设置无氮添加(N0 mg/kg)、低氮添加(N10 mg/kg)、中氮添加(N25 mg/kg)和高氮添加(N50 mg/kg)4个氮添加水平,进行微宇宙培养试验,测定土壤N2O排放。结果表明:与无氮添加处理相比,氮添加整体上降低3种林分土壤pH,增加土壤NH4+-N和NO3--N含量。无氮添加处理中杉木人工林和马尾松人工林土壤N2O累积排放量分别为9.67和9.62 mg/kg,显著高于米槠次生林土壤N2O累积排放量6.81 mg/kg。低氮添加处理中杉木人工林和马尾松人工林土壤N2O累积排放量显著高于米槠次生林。但在中氮和高氮添加处理中,3种林分土壤N2O累积排放量均无显著性差异。不同氮添加处理均促进3种林分土壤N2O排放,低氮添加对次生林土壤N2O排放影响的效应值为0.01,显著低于杉木人工林和马尾松人工林土壤的效应值0.45。但中氮和高氮添加对次生林土壤N2O排放影响效应值显著高于2种人工林,次生林土壤N2O排放更易受中氮和高氮添加刺激。N2O累计排放量与土壤NH4+-N和NO3--N含量呈极显著正相关(p<0.01),但与pH无显著相关关系,表明氮添加背景下,氮素有效性是控制森林土壤N2O排放的主要因素。综上,人工林土壤N2O排放高于次生林,但次生林土壤N2O排放对中氮和高氮添加更敏感。

    Abstract:

    To reveal the response of soil N2O emissions to forest types and nitrogen addition in subtropical forests, soil samples were collected from Castanopsis carlesii secondary forests, Cunninghamia lanceolata plantation and Pinus massoniana plantation located in Sanming City, Fujian Province. A microcosm was carried out and the soils were amended with NH4NO3 at four levels: no nitrogen addition (N0 mg/kg), low nitrogen addition (N10 mg/kg), medium nitrogen addition (N25 mg/kg) and high nitrogen addition (N50 mg/kg) to determine N2O flux. The results showed that nitrogen addition generally decreased soil pH, while increased soil NH4+-N and NO3--N contents. The cumulative N2O emissions in C. lanceolata and P. Massoniana plantations with no nitrogen addition were 9.67 and 9.62 mg/kg, respectively, and were significantly higher than 6.81mg/kg in C. carlesii secondary forest. Similar trend was found in soils with low nitrogen addition. However, in the medium and high nitrogen addition treatments, there were no significant differences in cumulative N2O emissions among the three forest stand types. Nitrogen addition increased soil N2O emission in all the three forest types, with the effect size of low nitrogen addition on N2O emissions in secondary forest soil being 0.01, significantly lower than the effect size of 0.45 in C. lanceolata and P. massoniana plantation soils. Conversely, the effect sizes of medium and high nitrogen additions on N2O emission were significantly higher in secondary forests than plantations. These results indicated that N2O emissions in secondary forests was more likely to be stimulated by medium or high nitrogen addition. Cumulative N2O emissions were positively associated with soil NH4+-N and NO3--N contents (p<0.01), rather than soil pH, indicating that available nitrogen was the main factor controlling soil N2O emissions in forest soils under nitrogen additions. Taken together, N2O emissions were higher in plantation soils than in secondary forest soil, but N2O emissions in secondary forests soil were more sensitive to medium and high nitrogen additions.

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邓米林, 叶桂萍, 胥超, 宛颂, 贺纪正, 林永新.林分类型和氮添加对亚热带森林土壤氧化亚氮排放的影响[J].水土保持学报,2023,37(6):262~267

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  • 收稿日期:2023-05-06
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  • 在线发布日期: 2023-12-27
  • 出版日期: 2023-12-28