模拟氮添加对亚热带杉木人工林土壤有机碳矿化的影响
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S714.2

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国家自然科学基金项目(31870601)资助。


Effects of Simulated Nitrogen Addition on Soil Organic Carbon Mineralization in Subtropical Cunninghamia lanceolata Plantation
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    摘要:

    为探讨氮添加对亚热带杉木人工林土壤有机碳矿化的影响,选择福建三明森林生态系统与全球变化国家野外科学观测研究站38年生杉木人工林土壤为研究对象,设置N0(0 mg/kg)、N10(100 mg/kg)、N25(250 mg/kg) 3个氮添加水平,并进行117 d的培养。结果表明:①氮添加后,土壤有机碳矿化速率在培养开始(0)即达到最大值,在培养前期(0 ~ 57 d)这一段时间内N0、N10和N25处理的有机碳矿化速率平均值显著下降了44%、45%、47%,而在整个培养期间3个处理有机碳平均矿化速率分别为9.97、9.27、8.89 mg/(kg·d);②有机碳矿化累积量随培养时间延长显著增加,随氮添加增加显著降低,与N0处理相比,培养117 d后N10、N25处理有机碳矿化累积量平均值分别降低了3.4%、7.4%;③微生物生物量对氮添加响应并不显著,但真菌/细菌比随氮添加增加而增大。总体上,氮添加主要是通过改变土壤有机碳和氮抑制了土壤有机碳矿化。因此,氮添加后土壤中碳、氮养分含量的变化是有机碳矿化变化的主要原因,而微生物群落结构变化则不是主要因素。

    Abstract:

    A sample plot of a Cunninghamia lanceolata plantation (38 a) in Fujian Sanming Forest Ecosystem National Observation and Research Station in subtropical China was selected to investigate the effects of nitrogen (N) addition on soil organic carbon(SOC) mineralization. Three N addition levels, N0 (0 mg/kg), N10 (100 mg/kg) and N25 (250 mg/kg) were set in a culture experiment which was carried out for 117 days. The results show that: 1) SOC mineralization rate reaches the maximum on the first day. At the early stage of culture (0-57 days), the mean organic carbon mineralization rate of N0, N10 and N25 treatments decreased significantly by 44%, 45% and 47%. During the culture period, the average SOC mineralization rate is 9.97 mg/(kg·d) under N0, 9.27 mg/(kg·d) under N10 and 8.89 mg/(kg·d) under N25. 2) The cumulative amount of SOC mineralization is increased significantly with the extension of culture time, and decreased significantly with the increased of N addition. Compared with N0, the average value of SOC mineralization accumulation is decreased by 3.4% under N10 and 7.4% under N25, respectively, after incubation for 117 days. 3) The response of microbial biomass to N addition is not significant, but the ratio of fungi to bacteria is increased with N addition. In general, N addition inhibits SOC mineralization mainly by changing soil C and N contents. Therefore, the change of soil C and N nutrient contents after N addition is the main reason for the change of SOC mineralization rather than the change of microbial community structure.

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席颖青,李晓,刘小飞.模拟氮添加对亚热带杉木人工林土壤有机碳矿化的影响[J].土壤,2023,55(1):196-204. XI Yingqing, LI Xiao, LIU Xiaofei. Effects of Simulated Nitrogen Addition on Soil Organic Carbon Mineralization in Subtropical Cunninghamia lanceolata Plantation[J]. Soils,2023,55(1):196-204

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  • 收稿日期:2022-09-27
  • 最后修改日期:2022-10-12
  • 录用日期:2022-10-14
  • 在线发布日期: 2023-03-10
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