| 黄莎琳，李 晶，杨文姬，林田苗，喻 武.海拔对藏东南山地土壤有机碳垂直分布格局的影响分析[J].广东农业科学,2022,49(1):62-69 |
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海拔对藏东南山地土壤有机碳垂直分布格局的影响分析 |
| Analysis of Impact of Altitude on Vertical Distribution Pattern of Soil Organic Carbon in Mountainous Regions of Southeastern Tibet |
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| DOI：10.16768/j.issn.1004-874X.2022.01.007 |
| 中文关键词: 高寒区 色季拉山 海拔梯度 物理性质 土壤有机碳 垂直分布 |
| 英文关键词: alpine region Sejila Mountain altitude gradient physical property soil organic carbon vertical distribution |
| 基金项目:水利部沙棘开发管理中心项目（2017-zg-zx-57）；国家自然科学基金重点基金（41930754）；西藏农牧学院农业资源与环境学科建设 - 研创项目（533320003） |
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| 中文摘要: |
| 【目的】分析藏东南地区高山生态系统在垂直分布带上的空间异质性，研究不同海拔土壤有机碳
（SOC）储量的分布特征及其影响因子。【方法】以高寒半湿润区藏东南典型山地色季拉山为研究对象，在海
拔 3 400~4 600 m 每隔 200 m 海拔梯度展开采样，通过野外调查与室内分析相结合的方法，探讨海拔对 SOC 垂直
分布特征的影响及其与其他理化指标的相关性。【结果】色季拉山土壤物理指标之间存在很大的空间异质性，
在海拔 3 400~4 600 m 土壤容重、总孔隙度、毛管孔隙度和非毛管孔隙度的变化范围分别为 0.72~1.08 g/cm3、
51.76%~67.06%、47.11%~58.03% 和 9.03%~11.04%；SOC 主要集中分布在 0~60 cm 土层中，不同海拔梯度 SOC
含量（1.57%~8.24%）随着土层深度的增加呈下降趋势，以海拔 4 618 m 高寒草甸的 SOC 含量最高，为其他海
拔的 1.76~3.07 倍；SOC 储量范围为 117.14~220.63 t/hm2
，以海拔 4 255 m 土层的 SOC 储量显著高于其他海拔高
度，相当于海拔 3 393 m 的 2 倍；不同海拔显著影响 0~60 cm 土层的 SOC 储量，整体上呈现单峰曲线变化趋势。
【结论】色季拉山不同植被类型土壤的 SOC 垂直分布差异显著，海拔梯度变化会直接或间接影响 SOC 的精准估
算，进而影响 SOC 的空间分布和预测。 |
| 英文摘要: |
| 【Objective】The spatial heterogeneity of alpine ecosystems in southeastern Tibet in the vertical
distribution zone was analyzed, and the distribution characteristics and influencing factors of soil organic carbon（SOC） reserves at different altitudes were studied.【Methods】Taking the Sejila Mountain, a typical mountain in southeastern Tibet
in the alpine and semi-humid region, as the research object, sampling was carried out at an altitude of 3 400-4 600 m with an
altitude gradient of 200 m, and the altitude was investigated by combining field investigation and indoor analysis. The impact
of altitude on the vertical distribution characteristics of SOC and its correlation with other physical and chemical indicators.
【Result】There was a great spatial heterogeneity among the soil physical indexes in the Sejila Mountain at an altitude of
3 400~4 600 m. The soil bulk density, total porosity, capillary porosity and non-capillary porosity varied 0.72-1.08 g/cm3
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51.76%-67.06%, 47.11%-58.03% and 9.03%-11.04%. SOC was mainly distributed in the 0-60 cm soil layer, and the SOC
contents of different altitude gradients（1.57%-8.24%）showed a downward trend with the increase of soil depth, and the SOC
content of the alpine meadow at an altitude of 4 618 m was the highest, which was 1.76-3.07 times that of other altitudes; SOC
reserve was 117.14-220.63 t/hm2
, among which the SOC reserve in the soil layer at an altitude of 4 255 m was significantly
higher than that at other altitudes, equivalent to 2 times that at an altitude of 3 393 m; different altitudes significantly affected
the SOC reserves in the 0-60 cm soil layer, showing a single peak as a whole curve change trend.【Conclusion】There are
significant differences in the vertical distribution of SOC under different vegetation types in the Sejila Mountain, and the change
of altitude gradient will directly or indirectly affects the accurate estimation of SOC, and then affects the spatial distribution and
prediction of SOC. |
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