| 粤北3种林分凋落叶-根系-土壤生态化学计量特征 |
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| 引用本文： | 李非凡,孙冰,裴男才,闫玮明,罗鑫华.粤北3种林分凋落叶-根系-土壤生态化学计量特征[J].浙江农林大学学报,2020,37(1):18-26. |
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| 作者姓名： | 李非凡 孙冰 裴男才 闫玮明 罗鑫华 |
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| 作者单位： | 1.中国林业科学研究院 热带林业研究所, 广东 广州 5105202.南京林业大学 林学院, 江苏 南京 2100373.广东乐昌杨东山十二度水省级自然保护区 管理处, 广东 乐昌 512231 |
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| 基金项目： | “十三五”国家重点研发计划项目SQ2017YFSF030111国家自然科学基金面上资助项目31570594 |
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| 摘 要： | 目的 分析人工林和次生林在养分分布方面的异同点和诱因，以掌握养分现状和变化规律及其在不同部位的存在情况。 方法 以粤北南亚热带地区相近林龄的红锥Castanopsis hystrix人工林、乐昌含笑Michelia chapensis人工林和次生林为研究对象，对凋落叶、根系及土壤（0~20 cm）全碳、全氮、全磷的质量分数进行了测定。 结果 ① 凋落叶全碳和全磷质量分数在3种林分间无显著差异（P>0.05），但红锥林凋落叶全氮质量分数显著高于乐昌含笑林和次生林；根系的全碳、全氮、全磷质量分数在3种林分间差异显著（P < 0.05），且全氮和全磷质量分数均为乐昌含笑林>次生林>红锥林；土壤的全碳、全氮、全磷质量分数差异显著，且均为红锥林>次生林>乐昌含笑林。②碳氮比在3种林分中均为根系>凋落叶>土壤；碳磷比在红锥林和次生林中均为根系>凋落叶>土壤，而在乐昌含笑林中为凋落叶>根系>土壤；氮磷比在红锥林、乐昌含笑林和次生林中均为凋落叶>根系>土壤。而土壤的碳氮比、碳磷比、氮磷比在3种林分中均无显著差异（P < 0.05）；凋落叶的碳氮比、碳磷比均为乐昌含笑林最高，根系的碳氮比、碳磷比均为红锥林>次生林>乐昌含笑林。③红锥林根系全氮和全磷质量分数、乐昌含笑林和次生林凋落物全氮和全磷质量分数以及根系全氮和全磷质量分数呈显著正相关（P < 0.05）；3种林分凋落叶和根系的碳氮比和氮磷比无相关性（P>0.05）；红锥林和乐昌含笑林的凋落叶、根系和土壤的碳磷比与氮磷比均呈显著正相关（P < 0.05），而次生林仅有凋落叶和土壤的碳磷比与氮磷比呈显著正相关（P < 0.05）。 结论 不同林分根系吸收土壤养分规律不同；与全国土壤养分均值相比，研究区域呈高氮低磷的格局，说明当地土壤受全磷限制，因此，可以根据需求适当施磷改善土壤养分。
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| 关 键 词： | 森林生态学 凋落叶-根系-土壤 生态化学计量特征 红锥林 乐昌含笑林 次生林 |
| 收稿时间： | 2019-02-22 |
Characteristics of litter-root-soil ecological stoichiometry of three forest stands in northern Guangdong |
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| LI Feifan,SUN Bing,PEI Nancai,YAN Weiming,LUO Xinhua.Characteristics of litter-root-soil ecological stoichiometry of three forest stands in northern Guangdong[J].Journal of Zhejiang A&F University,2020,37(1):18-26. |
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| Authors: | LI Feifan SUN Bing PEI Nancai YAN Weiming LUO Xinhua |
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| Affiliation: | 1.Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, Guangdong, China2.College of Forestry, Nanjing Forestry University, Nanjing 210037, Jiangsu, China3.Management Office of Yangdongshan Shierdushui Nature Reserve of Lechang, Lechang 512231, Guangdong, China |
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| Abstract: | Objective The similarities, differences and inducements of nutrient distribution between plantation and secondary forest were analyzed, in order to master the situation and dynamic law of nutrients in different parts. Method The leaves, roots and soil (0-20 cm) of the Castanopsis hystrix plantation(CHP), the Michelin chapensis plantation(MCP) and the secondary forest(SF) were investigated in the southern subtropical region of northern Guangdong. Total C, total N and total P concentrations of litter, roots and soil were measured. Result (1) There was no significant difference in the concentrations of C and P in the litter among the three stands (P>0.05), but the concentrations of litter N in the CHP were significantly higher than those in MCP and the secondary forest. The roots of C, N and P concentrations were significantly different among the three stands (P < 0.05) and both N and P concentrations were MCP > SF > CHP. The C, N, and P concentrations in the soil were significantly different and both were CHP > SF > MCP. (2) All the three stands showed a C/N ratios of roots > litter > soil; while CSP and the secondary forest showed a C/P ratios of roots > litter > soil. C/P ratios was litter > root > soil in the MCP. N/P ratios was litter > root > soil in the three stands. C/N, C/P, and N/P ratios were not significantly different among the three types of forests; C/N and C/P ratios of litter were highest in MCP. All C/N and C/P ratios of roots were CHP > SF > MCP. (3) The N and P concentrations of roots in CSP, the N and P concentrations of litter and roots in MCP and the secondary forest displayed a significantly positive correlation (P < 0.05). There was no correlation between C/N and N/P ratios in litter and roots of the three stands (P>0.05). There was a significant positive correlation between C/P and N/P ratios in litter, roots and soil of CHP and MCP (P < 0.05), while C/P and N/P ratios of the secondary forest only showed a significant positive correlation (P < 0.05) between litter and soil. Conclusion Roots of different stands displayed different laws of soil nutrient absorption. Compared with the national average value of soil nutrients, the study area showed a pattern of high N and low P, indicating that local soil was limited by P. Therefore, P can be appropriately applied according to demand to improve soil nutrient quality. |
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