[1]LI Wenyu,LIU Xiaofang,ZHAO Yonggang,et al.Spatial Variability of Soil Organic Carbon and Its Influencing Factors in an Artificial Caragana korshinskii Dominated Small Watershed in the Hilly Region of the Loess Plateau[J].Research of Soil and Water Conservation,2020,27(02):15-22.
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Spatial Variability of Soil Organic Carbon and Its Influencing Factors in an Artificial Caragana korshinskii Dominated Small Watershed in the Hilly Region of the Loess Plateau
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 02
Page number:
15-22
Column:
Public date:
2020-03-30
- Title:
- Spatial Variability of Soil Organic Carbon and Its Influencing Factors in an Artificial Caragana korshinskii Dominated Small Watershed in the Hilly Region of the Loess Plateau
- Keywords:
- soil organic carbon; geostatistics; Caragana korshinskii; terrain; land preparation method
- CLC:
- S153.6
- DOI:
- -
- Abstract:
- Caragana korshinskii is an important plant species in loess hill-gully area to restore ecological environment. To further understand the effect of large-area plantation with Caragana korshinskii on the spatial distribution of soil organic carbon in small watershed, Huochawan watershed in Shanghuang Village, Guyuan City, Ningxia was selected as the research site to analyze the spatial variation characteristics of soil organic carbon and its influencing factors. Based on field sampling and laboratory testing, the Geo-statistics and ArcGIS spatial analysis techniques were used to study the spatial distribution and variability of soil organic carbon in 0—40 cm soil layer. The results showed that:(1)the differences of average soil organic carbon among different land uses reached the remarkable level, the average content of soil organic carbon decreased in the order: forestland>shrub land>farmland>grassland, the soil organic carbon content ranged from 8.78 g/kg to 29.81 g/kg, and the coefficient of variation was between 19.03% and 21.80%, which belonged to intermediate variability;(2)the best theoretical models of soil organic carbon in each soil layer in the small watershed are spherical models, which presented the strong spatial distribution correlation, and the spatial variability of soil organic carbon pool was mainly caused by structural factors;(3)the soil organic carbon content in the small watershed presented a polygon spatial distribution, and the overall soil organic carbon content in the region dominated by the plantation Caragana korshinskii was high;(4)slope position and microtopography had the significant effect on soil organic carbon in small watershed (p<0.05), while only microtopography had a significant effect on shrub land (p<0.05). In general, the accumulation of soil organic carbon is being enhanced by the cultivation of caragana korshinskii, but at the same time the microtopography land preparation method has an important impact on the spatial variability of soil organic carbon. It is necessary to study soil organic carbon by comprehensively considering the combination of the land preparation method with vegetation type in the actual region.
- References:
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Last Update:
2020-02-25