Spatial Variation Characteristics and Influencing Factors of Soil Organic Carbon in a Rocky Beach of Sejila Mountain, Tibetan Plateau

Wang Xiaojiao; Liang Wandong; Wan Dan; Yu Wu; Yang Hui

doi:10.13961/j.cnki.stbctb.2023.01.041

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Spatial Variation Characteristics and Influencing Factors of Soil Organic Carbon in a Rocky Beach of Sejila Mountain, Tibetan Plateau

- Spatial Variation Characteristics and Influencing Factors of Soil Organic Carbon in a Rocky Beach of Sejila Mountain, Tibetan Plateau
- Bulletin of Soiland Water Conservation Vol. 43, Issue 1, Pages: 359-366(2023)
- 作者机构：
  
  西藏农牧学院,西藏,林芝,860000
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2023.01.041
  CLC： S714.3
- Published：2023
- 稿件说明：
移动端阅览
Wang Xiaojiao, Liang Wandong, Wan Dan, et al. Spatial Variation Characteristics and Influencing Factors of Soil Organic Carbon in a Rocky Beach of Sejila Mountain, Tibetan Plateau[J]. Bulletin of Soiland Water Conservation, 2023, 43(1): 359-366.
DOI：

Wang Xiaojiao, Liang Wandong, Wan Dan, et al. Spatial Variation Characteristics and Influencing Factors of Soil Organic Carbon in a Rocky Beach of Sejila Mountain, Tibetan Plateau[J]. Bulletin of Soiland Water Conservation, 2023, 43(1): 359-366. DOI： 10.13961/j.cnki.stbctb.2023.01.041.

摘要

[目的

]

分析青藏高原不同海拔下表层土壤可溶性有机碳(DOC)，易氧化有机碳(ROC)、碳库稳定性及碳储量变化特征研究及土壤有机碳(SOC)，DOC的影响因素，为后续复杂地形寒区SOC的稳定性研究提供科学依据。[方法

]

以色季拉山流石滩为研究区，以单因素方差分析法分析了4 300～4 700 m之间不同海拔土壤物理性质，DOC，ROC以及SOC的含量特征，结合Pearson相关分析与冗余分析探讨了DOC，ROC与各因子之间的相互关系。[结果

]

①土壤容重、密度与海拔呈负相关，其最大值分别为1.56，1.12 g/cm

，土壤含水率和孔隙度与海拔呈正相关，其最大值分别为74.22%，58.70%； ②SOC含量随海拔升高呈现先升高后降低趋势，DOC，ROC随海拔升高而呈现出波动变化趋势； ③海拔4 400 m时DOC/SOC，ROC/SOC达到最大值，可溶性有机碳储量(DOCS)和有机碳储量(SOCS)均值分别为40.779 g/m

，8.105 kg/m

，流石滩土壤碳库稳定性较好； ④DOC与土壤物理性质不相关，但与SOCS有一定相关性；ROC则与物理性质和SOC及其相关因子均有一定的相关性；各因子对色季拉山流石滩土壤DOC和ROC变化的解释贡献率排序大小为：DOCS＞土壤孔隙度＞ROC/SOC＞土壤含水率＞SOC＞SOCS＞DOC/SOC＞土壤密度。[结论

]

不同海拔流石滩表层土壤DOC，ROC与海拔有一定相关性，且DOCS、土壤孔隙度与ROC/SOC均是影响DOC，ROC含量的重要因子，同时各因子间存在密切的关系。

Abstract

[Objective] The characteristics of surface soil soluble organic carbon (DOC)

readily oxidized organic carbon (ROC)

carbon pool stability

and carbon storage changes

as well as influencing factors of soil organic carbon (SOC) and DOC at different elevations in Tibetan Plateau were analyzed in order to provide a scientific basis for subsequent research on the stability of SOC in cold regions with complex terrain. [Methods] Data were collected from a rocky beach of the Sejila Mountain. One-way ANOVA was used to analyze soil physical properties and DOC

ROC

and SOC content characteristics at altitudes ranging from 4 300 m to 4 700 m. Pearson correlation analysis and redundancy analysis were used to determine the relationship between DOC

ROC

and influencing factors. [Results] ① Soil bulk density and dry density were negatively correlated with altitude

and their maximum values were 1.56 g/cm3 and 1.12 g/cm3

respectively. Soil water content and porosity were positively correlated with altitude

and the maximum values were 74.22% and 58.70%

respectively. ② SOC content initially increased with increasing altitude and then decreased. DOC and ROC showed fluctuating trends with elevation. ③ DOC/SOC and ROC/SOC reached maximum values at 4 400 m. The average DOC and SOC values were 40.779 kg/m2 and 8.105 kg/m2

respectively. The stability of the soil carbon pool in the rocky beach area was relatively good. ④ DOC had no correlation with soil physical properties

but was correlated with average SOC. ROC was correlated with physical properties

SOC

and its related factors. Each factor was correlated with changes in DOC and ROC in the rocky beach area of the Sejila Mountains. Explanatory contribution rate follow the order of average DOC＞soil porosity＞ROC/SOC＞soil water content＞SOC＞average SOC＞DOC/SOC＞soil dry density. [Conclusion] Soil DOC and ROC at different elevations were correlated

and average DOC

soil porosity

and ROC/SOC were important factors affecting the contents of DOC and ROC. There were close relationships among these factors.

关键词

Keywords

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