| Cite this article: | 曹世宁,罗雨甜,余博航,等.川西王朗地区土壤含水量和碳库沿海拔梯度的变化规律及相互关系[J].灌溉排水学报,0,():-. |
| caoshining,luoyutian,yubohang,et al.川西王朗地区土壤含水量和碳库沿海拔梯度的变化规律及相互关系[J].灌溉排水学报,0,():-. |
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| The variations and interrelationships of soil moisture and soil carbon pool along the elevation gradient in Wanglang, Sichuan, China. |
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caoshining1, luoyutian2, yubohang1, zhaoyuze1, wangjianming1
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1.School of Ecology and Nature Conservation，Beijing Forestry University;2.Sichuan Wanglang National Nature Reserve Administration Bureau,Pingwu,Sichuan Province
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| Abstract: |
| 【Objective】Clarify the variation characteristics of soil moisture , organic carbon, inorganic carbon, and total carbon along vertical distribution and altitude gradient in Wanglang area, and explore their interrelationships and driving mechanisms.【Method】By collecting soil samples from different soil layers (0~15 cm and 15~30 cm) in the Wanglang area, the organic carbon, inorganic carbon, total carbon, and moisture of the soil were measured. Mann Whitney U test and linear regression analysis were used to study the vertical distribution characteristics of soil carbon components and moisture and their correlation with altitude, and to explore the coupling relationship between various indicators.【Result】There are differences in the relative contributions of organic carbon and inorganic carbon to total carbon in the surface and subsoil layers, with organic carbon dominating; In addition, the correlation between total carbon and organic carbon is stronger than its correlation with inorganic carbon (surface organic carbon R 2=0.998, surface inorganic carbon R2=0.566, P<0.001, sublayer organic carbon R2=0.995, sublayer inorganic carbon R2=0.551), P<0.001), This indicates that organic carbon plays a more significant role in driving total carbon changes, and the total carbon, organic carbon, inorganic carbon, and soil moisture of the surface soil are significantly higher than those of the sub layers (P<0.05). The organic carbon, inorganic carbon, total carbon, and moisture in the surface soil are significantly positively correlated with altitude (P<0.001); The organic carbon, inorganic carbon, total carbon, and moisture in the sublayer soil are also significantly positively correlated with altitude (P<0.05). In the surface soil, the positive correlation between inorganic carbon and moisture is slightly stronger than that of organic carbon (R2=0.421 and 0.403, respectively), P<0.001); In the sublayer soil, the positive correlation between organic carbon and moisture is more significant (R2=0.611, P<0.001), higher than the correlation between inorganic carbon (R2=0.375, P<0.001). There is a significant positive correlation (P<0.001) between inorganic carbon and organic carbon in both surface and sub layer soils, indicating a possible biogeochemical coupling mechanism.【Conclusion】The soil carbon pool in Wanglang area is mainly dominated by the contribution of organic carbon, and each carbon component and soil moisture show significant monotonic increasing characteristics of altitude gradient changes. However, there are certain differences in the variation patterns of different carbon components. Meanwhile, the influence of soil moisture on organic carbon is significantly stronger than on inorganic carbon, indicating that organic carbon is more sensitive to the driving force of moisture conditions. |
| Key words: altitude;soil moisture; soil organic carbon; soil inorganic carbon |
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