| 杉木林地不同更新方式土壤有机碳垂直分布及储量 |
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| 引用本文： | 徐桂林,方晰,田大伦,唐志娟,张铸三.杉木林地不同更新方式土壤有机碳垂直分布及储量[J].浙江林学院学报,2009,26(3):333-340. |
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| 作者姓名： | 徐桂林 方晰 田大伦 唐志娟 张铸三 |
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| 作者单位： | 中南林业科技大学,生态教研室,湖南,长沙,410004;中南林业科技大学,亚热带森林生态湖南省普通高等学校,重点实验窒,湖南,长沙,410004 |
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| 基金项目： | 科学技术部国家野外科学观测研究站资助项目，科学技术部公益性研究项目，国家林业局资助项目，湖南省教育厅资助项目，中南林业科技大学青年基金 |
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| 摘 要： | 比较研究了湖南会同第1代杉木Cunninghamia lanceolata林采伐迹地经不同更新方式转变为第2代杉木林地、自然更新灌木林地、板栗Castanea mollissima林地、柑橘Citrus reticulata林地、芒草Andropogon chinensis地的土壤（0～75cm）有机碳质量分数的垂直分布及其储量。结果表明,林地土壤（0～75cm）有机碳质量分数随着土壤深度的增加而逐渐下降。除了板栗林地30～45cm土层土壤有机碳（SOC）质量分数显著高于芒草地同一土层（P=0.049）外,其余不同林地同一土层SOC质量分数差异不显著（P〉0.05）,SOC平均质量分数大小排序为：板栗林地（14.759g·kg^-1）〉12年生杉木林地（13.537g·kg^-1）〉20年生杉木林地（12.807g·kg^-1）〉自然更新灌木林地（11.656g·kg^-1）〉柑橘林地（10.727g·kg^-1）〉芒草地（10.088g·kg^-1）。土壤碳氮比随着土壤深度的增加而趋于下降,芒草地各土层的碳氮比最低。杉木林采伐后无论是转变为杉木人工林地还是经济林地或者转变为经济林地后因管理不善再转变成芒草地,林地土壤有机碳储量均处于亏损状态,年均降幅最小的是板栗林地,其次为12年生杉木林地和20年生杉木林地。表明在杉木林采伐迹地更新过程中,选择落叶根深型植物更有利于土壤有机碳质量分数和储量的保持。
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| 关 键 词： | 森林土壤学 杉木林 更新方式 土壤有机碳 土壤碳氮比 有机碳储量 |
Soil organic carbon: distribution and storage with five regeneration patterns in Cunninghamia lanceolata forests |
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| XU Gui-lin,FANG Xi,TIAN Da-lun,TANG Zhi-juan,ZHANG Zhu-san.Soil organic carbon: distribution and storage with five regeneration patterns in Cunninghamia lanceolata forests[J].Journal of Zhejiang Forestry College,2009,26(3):333-340. |
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| Authors: | XU Gui-lin FANG Xi TIAN Da-lun TANG Zhi-juan ZHANG Zhu-san |
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| Institution: | XU Gui-lin, FANG Xi, TIAN Da-lun, TANG Zhi-juan, ZHANG Zhu-san( 1. Research Section of Ecology, Central South University of Forestry and Technology, Changsha 410004, Hunan, China; 2. Key Laboratory of Subtropical Forest Ecology, Colleges and Universities of Hunan Province, Central South University of Forestry and Technology, Changsha 410004, Hunan, China) |
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| Abstract: | The vertical distribution and storage of soil organic carbon （SOC） in the depth of 0 - 75 cm were contrasted and discussed by sampling and laboratory analysis under forests of primary Cunninghamia lanc e olata （Chinese fir （Chinese fir） forests converted 12 years and 20 years）, b） with regeneration patterns of a） secondary Chinese fir forests natural woods, c） Castanea mollissima tree plantations, d）Citrus reticulata plantations and results showed SOC and regeneration patterns. In 30 C/N - 45 e） Andropogon chinensis grass in in vertical directions decreased cm soil depth, the SOC content in Huitong County, Hunan Province. The generally with depth under different the C. mollissima field was significantly higher than that in A. chinensis grass （P = 0.049, t test）, but difference of SOC content was not significant in other layers among other regeneration patterns （P〉0.05, t test）. The sequence of mean SOC content of 0 - 75 cm was C. moUissima 〉 Chinese fir 12 years 〉 Chinese fir 20 years 〉 natural woods 〉 Citrus retculata 〉 A. chinensis grass. The five regeneration patterns resulted in loss of SOC storage （0 - 60cm）, with mean annual decrease being C. mollissima （2.201 t·hm^-2·a·-1）〈 Chinese fir 12 years （2.666 t·hm^-2.a^-1）〈 Chinese fir 20 years（2.837 t·hm^-2·a^-1） 〈 natural woods （3.207 t·hm^-2·a^-1）〈A, chinensis grass（3.278 t·hm^-2·a^-1） 〈Citrus reticulata （3.565 t·hm^-2·a^-1）. Thus, for Chinese fir stands, regeneration with leaf-fall and deeper rooted trees will have a greater potential for SOC storage. |
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| Keywords: | forest pedology Chinese fir forest regeneration pattern soil organic carbon soil C/N ratio soil organic carbon storage |
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