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应用生态学报 ›› 2023, Vol. 34 ›› Issue (4): 962-968.doi: 10.13287/j.1001-9332.202304.001

• 研究论文 • 上一篇    下一篇

北江中下游不同林分类型土壤C、N、P生态化学计量特征

许窕孜1,2, 叶彩红1,2, 张耕2, 张中瑞2, 朱航勇2, 何茜1, 丁晓纲2*   

  1. 1华南农业大学林学与风景园林学院, 广州 510642;
    2广东省森林培育与保护利用重点实验室/广东省林业科学研究院, 广州 510520
  • 收稿日期:2022-10-12 接受日期:2023-01-18 出版日期:2023-04-15 发布日期:2023-10-15
  • 通讯作者: *E-mail: 27267152@qq.com
  • 作者简介:许窕孜, 女, 1998年生, 硕士研究生。主要从事森林培育学研究。E-mail: 986812759@qq.com
  • 基金资助:
    广东省省级财政专项资金“林地土壤调查”项目(2020—2022年)、广东省林业科技计划项目(2019-07)和广东省省级生态公益林效益补偿资金省统筹经费项目(2022年)

Soil C, N and P stoichiometry in different forest stand types in the middle and lower reaches of the Beijiang River, China

XU Tiaozi1,2, YE Caihong1,2, ZHANG Geng2, ZHANG Zhongrui2, ZHU Hangyong2, HE Qian1, DING Xiaogang2*   

  1. 1College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China;
    2Guangdong Key Laboratory of Silviculture, Protection and Utilization/Guangdong Academy of Forestry, Guangzhou 510520, China
  • Received:2022-10-12 Accepted:2023-01-18 Online:2023-04-15 Published:2023-10-15

摘要: 选取北江中下游阔叶林、针叶林、针阔混交林3种类型林分为对象,研究0~80 cm土层土壤的有机碳(C)、全氮(N)、全磷(P)含量及其生态化学计量比的垂直分布特征。结果表明: 3种林分类型的土壤C、N、P含量分别为12.17~14.25、1.14~1.31、0.27~0.30 g·kg-1,C、N含量随土层深度增加呈降低的趋势。各土层土壤C、N含量表现为针阔混交林>针叶林>阔叶林;P含量在3种林分类型间差异不显著,在垂直剖面上无明显的规律性变化。3种林分类型土壤C/N、C/P、N/P分别为11.2~11.3、49.0~60.3、4.5~5.7,土壤C/N在3种林分类型间差异不显著,土壤C/P、N/P均以针阔混交林最高,且显著高于阔叶林和针叶林。土壤深度和林分类型对土壤C、N、P含量及其化学计量比无显著的交互作用,但C与N、N与C/P在各林分类型和土层中均呈显著正相关。土壤C/P和N/P对林分类型的生态指示作用更明显,针阔混交林受P限制较强。

关键词: 林分类型, 土壤养分, 生态化学计量, 垂直分布

Abstract: We examined the vertical distribution characteristics of soil organic carbon (C), total nitrogen (N), total phosphorus (P) and their ecological stoichiometric ratios in 0-80 cm soil profile under three forest stand types in the middle and lower reaches of the Beijiang River, including broad-leaved forest, coniferous forest, and mixed coniferous and broad-leaved forest. The results showed that soil C, N and P contents of the three forest stand types were 12.17-14.25, 1.14-1.31, and 0.27-0.30 g·kg-1, respectively. The contents of C and N decreased with the increases of soil depth. The content of C and N in each soil layer showed that coniferous and broad-leaved mixed forest > coniferous forest > broad-leaved forest. There was no significant difference in P content among the three stand types, and there was no obvious variation in the vertical profile. The soil C/N, C/P, and N/P of the three forest types were 11.2-11.3, 49.0-60.3, and 4.5-5.7, respectively. There was no significant difference in soil C/N among the three stand types. The highest soil C/P and N/P were found in the mixed forest. There was no interaction between soil depth and stand type in affecting soil C, N, P contents and their stoichiometric ratios. There was significant positive correlation between C and N, and between N and C/P in each stand type and soil layer. Soil C/P and N/P had stronger ecological indicating effects on stand types. The coniferous and broad-leaved mixed forest was strongly limited by P availability.

Key words: stand type, soil nutrient, ecological stoichiometry, vertical distribution