| 西双版纳热带森林恢复过程中土壤有机碳矿化速率的时空变化 |
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| 引用本文： | 王平,王邵军,曹乾斌,左倩倩,赵爽,杨波.西双版纳热带森林恢复过程中土壤有机碳矿化速率的时空变化[J].西北林学院学报,2021,36(3):22-28. |
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| 作者姓名： | 王平 王邵军 曹乾斌 左倩倩 赵爽 杨波 |
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| 作者单位： | （西南林业大学 生态与环境学院，云南 昆明 650224） |
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| 摘 要： | 为探究热带次生森林恢复对土壤有机碳矿化的影响，以西双版纳白背桐（恢复初期）和高檐蒲桃（恢复后期）次生热带森林群落为对象，通过室内需氧培养法研究热带森林土壤有机碳矿化速率的时空变化，并采用相关性和主成分分析方法揭示土壤微生物量碳及理化性质对有机碳矿化的影响特征。结果表明，随着次生热带森林的恢复，恢复后期的土壤有机碳矿化速率（4.29 mg·kg-1·d-1）显著高于恢复初期（3.50 mg·kg-1·d-1）；土壤有机碳矿化速率均呈单峰型季节变化，6月最高（4.78~5.60 mg·kg-1·d-1），且随土层加深而降低，其中0~5 cm土层矿化速率是10~15 cm的1.8~1.9倍；高檐蒲桃群落土壤有机质、易氧化碳、微生物量碳、全N和含水量相较于白背桐群落分别增加了11.3%、30.8%、25.7%、14.3%和23.5%；群落土壤有机碳矿化速率与微生物量碳、有机质、易氧化碳、全N和铵态N呈极显著(P<0.01)或显著(P<0.05)正相关，其中土壤有机质、微生物量碳和易氧化碳是有机碳矿化的主控因子。西双版纳热带次生森林恢复主要通过改变土壤有机质积累及活性有机碳库组分（如易氧化碳与微生物量碳）来调控土壤有机碳的矿化动态。
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| 关 键 词： | 热带次生森林 森林恢复 有机碳矿化 微生物量碳 |
Spatiotemporal Dynamics of Soil Carbon Mineralization Rates during the Restoration of Xishuangbanna Tropical Forests |
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| WANG Ping,WANG Shao-jun,CAO Gan-bin,ZUO Qian-qian,ZHAO Shuang,YANG Bo. Spatiotemporal Dynamics of Soil Carbon Mineralization Rates during the Restoration of Xishuangbanna Tropical Forests[J].Journal of Northwest Forestry University,2021,36(3):22-28. |
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| Authors: | WANG Ping WANG Shao-jun CAO Gan-bin ZUO Qian-qian ZHAO Shuang YANG Bo |
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| Institution: | (College of Ecology and Environment,Southwest Forestry University,Kunming 650224,Yunnan,China) |
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| Abstract: | This study aimed to explore the effect of tropical secondary forest restoration on soil organic carbon (SOC) mineralization.An indoor aerobic culture method was applied to explore the spatiotemporal changes in SOC mineralization rates in Mallotus paniculatus (primary stage) and Syzygium oblatum (later stage) communities during the restoration of Xishuangbanna tropical forests.The correlation and principal component analysis were also used to reveal the effect of soil microbial carbon and physicochemical properties on SOC mineralization.The results showed that SOC mineralization was higher in later restoration stage (4.29 mg·kg-1·d-1) than in early stage (3.50 mg·kg-1·d-1).The SOC mineralization rates in M.paniculatus and S.oblatum communities showed unimodal seasonal changes,with the maximum value observed in June (4.78 mg·kg-1·d-1 and 5.60 mg·kg-1·d-1,respectively).The rates of SOC mineralization decreased along soil profile,and they were 1.8-1.9 times in 0-5 cm layer than in 10-15 cm layer.Soil organic matter,readily oxidized carbon,microbial carbon,total nitrogen,and water content increased by 11.3%,30.8%,25.7%,14.3%,and 23.5%,respectively,in S.oblatum community compared to M.paniculatus community (P<0.05).The SOC mineralization rates were significantly correlated with soil microbial carbon,organic matter,easily oxidation carbon,total nitrogen,and ammonium nitrogen (P<0.05 or 0.01).The principal component analysis indicated that soil organic matter,microbial carbon,and readily oxidized carbon were the main controlling factors for SOC mineralization.Therefore,we concluded that tropical forest restoration could regulate spatiotemporal dynamics of SOC mineralization,via mediating the accumulation of soil organic matter and the allocation of active organic carbon pool (e.g.,microbial and easily oxidation carbon) in tropical Xishuangbanna. |
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| Keywords: | tropical secondary forest forest restoration organic carbon mineralization microbial carbon |
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