西藏原始暗针叶林凋落物有机碳释放特征与土壤有机碳库关系研究

段斐; 方江平; 周晨霓

doi:10.13870/j.cnki.stbcxb.2020.03.050

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西藏原始暗针叶林凋落物有机碳释放特征与土壤有机碳库关系研究

更新时间：2025-03-12

- 西藏原始暗针叶林凋落物有机碳释放特征与土壤有机碳库关系研究
- Study on the Relationship Between the Release Characteristics of Organic Carbon from Litters and Soil Organic Carbon Pool in Tibetan Primitive Dark Coniferous Forest
- 水土保持学报 2020年34卷第3期页码：349-355
- 作者机构：
  
  1. 西藏农牧学院高原生态研究所,西藏,林芝,860000
  2. 西藏高原森林生态教育部重点实验室,西藏,林芝,860000
  3. 西藏自治区生态安全联合重点实验室,西藏,林芝,860000
- 作者简介：
  
  [ "段斐(1990-)女,甘肃民勤人,硕士,助教,主要从事森林生态研究。E-mail:duanfei901017@Sina.com" ]
- 基金信息：
  
  国家自然科学基金项目（31960256）西藏自治区重大科技专项（XZ201901-GA-08）西藏自治区自然科学基金项目（XZ 2019 ZR G-70）
- DOI：10.13870/j.cnki.stbcxb.2020.03.050
  中图分类号： Q14
- 纸质出版：2020
- 稿件说明：
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段斐, 方江平, 周晨霓. 西藏原始暗针叶林凋落物有机碳释放特征与土壤有机碳库关系研究[J]. 水土保持学报, 2020,34(3):349-355.

DUAN Fei, FANG Jiangping, ZHOU Chenni. Study on the Relationship Between the Release Characteristics of Organic Carbon from Litters and Soil Organic Carbon Pool in Tibetan Primitive Dark Coniferous Forest[J]. 2020, 34(3): 349-355.
段斐, 方江平, 周晨霓. 西藏原始暗针叶林凋落物有机碳释放特征与土壤有机碳库关系研究[J]. 水土保持学报, 2020,34(3):349-355. DOI： 10.13870/j.cnki.stbcxb.2020.03.050.

DUAN Fei, FANG Jiangping, ZHOU Chenni. Study on the Relationship Between the Release Characteristics of Organic Carbon from Litters and Soil Organic Carbon Pool in Tibetan Primitive Dark Coniferous Forest[J]. 2020, 34(3): 349-355. DOI： 10.13870/j.cnki.stbcxb.2020.03.050.

摘要

结合野外凋落物分解袋法和室内分析试验，对藏东南2种典型暗针叶林—急尖长苞冷杉（Abies georgei var. Smithii）和林芝云杉（Picea likiangensis var. linzhiensis）凋落物的分解和有机碳释放特征进行研究，分析了2种亚高山暗针叶林凋落物有机碳释放速率与土壤有机碳及其组分之间的关系。结果表明：藏东南2种原始暗针叶林凋落物分解均呈现出雨季分解快（4—9月）、旱季分解慢（10—翌年3月），前期分解快（3—9月）、后期分解慢（10—翌年2月）的特征，且冷杉（PLLF）分解速率大于云杉（AGSF），Olson指数衰减模型能够较好地模拟2种暗针叶林凋落物的分解，冷杉（PLLF）和云杉（AGSF）凋落物半分解时间为2.11，2.52年；分解95%时间为8.96，10.84年；2种暗针叶林凋落物中有机碳含量表现出先上升后下降，再平稳降低的趋势，而2种暗针叶林凋落物中有机碳释放速率表现出先短暂富集再释放的模式；2种暗针叶林土壤总有机碳（TOC）及其活性组分（MBC、POC、LOC）含量都具有明显的表聚性（p<0.01），且同一土壤层次内TOC、MBC、POC、LOC互相之间均呈极显著正相关关系（p<0.01）；2种暗针叶林凋落物分解进程中有机碳的释放速率与表层土（0—10 cm）中TOC、MBC、POC、LOC含量、10—20 cm土层中的TOC、MBC含量以及20—40 cm土层中MBC含量之间呈现显著的正相关（p<0.05）。

Abstract

The decomposition and organic carbon release characteristics of litters of Abies georgei var. smithii and Picea likiangensis var. linzhiensis in two typical dark coniferous forests in southeastern Tibet were studied by combining the method of litter decomposition bag and laboratory analysis

the relationship between organic carbon release rate and soil organic carbon and its components in two subalpine dark coniferous forests was analyzed

the results showed that the decomposition of litters in the two original dark coniferous forests in southeastern Tibet showed the characteristics of fast decomposition in rainy season (April to September)

slow decomposition in dry season (October to march)

fast decomposition in early stage (march to September) and slow decomposition in late stage (October to February). The decomposition rate of fir (PLLF) was higher than that of spruce (AGSF). Olson exponential decay model could well model the decomposition of litter in two dark coniferous forests. The half-decomposition time of litter in fir (PLLF) and spruce (AGSF) were 2.11 and 2.52 years. The 95% of decomposition time were 8.96 and 10.84 years. The organic carbon content in the litters of the two dark coniferous forests showed a trend of first rising

then falling

and then steadily declining

while the release rate of organic carbon in the litters showed a pattern of first brief enrichment and then release. The contents of total organic carbon (TOC) and its active components (MBC

POC and LOC) in the soil of the two dark coniferous forests were obviously surficial (p<0.01)

and the contents of TOC

MBC

POC and LOC in the same soil layer were significantly positively correlated with each other (p<0.01). There was a significant positive correlation between the release rate of organic carbon in the decomposition process of litters of the two dark coniferous forests and the contents of TOC

MBC

POC and LOC in the topsoil (0-10 cm)

TOC and MBC in the soil layer of 10—20 cm and MBC in the soil layer of 20—40 cm (p<0.05).

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