| 摘要: |
| 为探究宁夏罗山不同植被类型土壤有机碳分布特征, 以罗山国家级自然保护区分布的 4 种典型
植被类型包括草地、 灌丛、 油松 Pinus tabuliformis 和青海云杉 Picea crassifolia 土壤为研究对象, 分析不同
植被类型土壤剖面有机碳含量及碳储量的分布规律。 结果表明, (1) 不同植被类型土壤有机碳含量及储
量随土层深度的增加呈逐渐减少的趋势, 土壤有机碳含量和碳储量由大到小表现为油松、 青油云杉、 灌
丛、 草地, 且差异极显著 (P<0. 01)。 该研究结果证实在干旱半干旱区山地森林生态系统土壤有机碳含量
和储量在海拔梯度下符合 “中部膨胀” 理论假设。 (2) 土壤水溶性有机碳含量随土层深度的增加而降低,
变化范围为 340. 8~540. 6 mg·kg
-1
, 以油松最高。 土壤水溶性有机碳分配比例以草地最高, 随着土层深
度的增加而逐渐升高。 (3) 青海云杉土壤有机碳含量与全盐、 电导率呈显著正相关, 其余植被类型的土
壤有机碳含量与 pH 值呈现显著负相关, 但土壤水溶性有机碳含量与各土壤理化因子均无显著相关性。 因
此, 在干旱半干旱地区实施退耕还林还草和禁牧政策, 并根据不同植被类型改善土壤的养分供应水平, 有
利于提高林草生态系统土壤的碳封存潜力。 |
| 关键词: 土壤有机碳 分布特征 水溶性有机碳 植被类型 宁夏罗山 |
| DOI： |
| 分类号: |
| 基金项目: |
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| Distribution Characteristics of Soil Organic Carbon Across the Different Typical Vegetation Types in Luoshan, Ningxia |
|
Xu Zhipeng1, LI Fan2, DING Wanquan2, CAO Ye1, Yang Jian1
|
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1.Ningxia Hui Autonomous Region Forestry Investigation and Planning Institute;2.Ningxia Luoshan National Nature Reserve Administration
|
| Abstract: |
| To investigate the distribution characteristics of soil organic carbon (SOC) under different vegetation types in Luoshan National Nature Reserve of Ningxia, four typical vegetation types, grassland (CD),
shrub (GC), Pinus tabuliformis forest (YS), and Picea crassifolia forest (QH), were selected as research
subjects to analyze the distribution patterns of soil organic carbon content and carbon storage across soil profiles.
The results showed that the SOC content and organic carbon storage decreased with increasing soil depth across
all vegetation types, with the order YS>QH>GC>CD, showing extremely significant differences (P<0. 01).
This study confirms that the soil organic carbon content and storage in mountain forest ecosystems of arid and
semi-arid regions conform to the "central expansion" hypothesis along the elevational gradient. The soil dissolved organic carbon (DOC) content decreased with soil depth (340. 8-540. 6 mg·kg
-1
), being the highest YS. The distribution ratio of soil DOC was highest in the CD and increased with increasing soil depth. The
SOC content of P. crassifolia forest showed significant positive correlations with total salt and electrical conductivity, while other vegetation types exhibited a significant negative correlation between SOC and pH. No significant correlations were found between DOC and physical and chemical indices. Therefore, implementing policies
such as returning farmland to forests and grasslands and banning grazing in semi-arid areas, and improving soil
nutrient supply levels according to different vegetation types, is beneficial for enhancing the carbon sequestration
potential of soil in forest and grassland ecosystems. |
| Key words: soil organic carbon distribution characteristics water soluble organic carbon vegetation types Luoshan |
