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.
黄土丘陵区人工柠条恢复为主小流域土壤有机碳空间变异性及其影响因素
- 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
- 文章编号:
- 1005-3409(2020)02-0015-08
- Keywords:
- soil organic carbon; geostatistics; Caragana korshinskii; terrain; land preparation method
- 分类号:
- S153.6
- 文献标志码:
- A
- 摘要:
- 柠条是黄土丘陵区人工植被恢复生态环境的重要树种。为进一步研究大面积种植柠条对小流域土壤有机碳空间分布的影响,选择人工柠条种植为主的宁夏固原市上黄村火岔湾小流域为研究区域,分析了其土壤有机碳的空间变异特征及其影响因素。基于野外取样和室内分析,利用地统计学和ArcGIS空间分析,分析了小流域0—40 cm土层土壤有机碳的空间分布与变异性,不同土地利用方式以及地形和整地方式等对其的影响。结果表明:(1)不同土地利用方式对小流域土壤有机碳含量有显著影响,表现为林地>灌木地>农地>草地,分布范围为8.78～29.81 g/kg,变异系数为19.03%～21.80%,属中等程度变异。(2)小流域各土层有机碳的最优拟合模型均为球面模型,具有强烈的空间分布相关性,并以结构性因素引起的变异为主。(3)小流域土壤有机碳含量呈斑块状空间分布,以人工种植柠条为主的区域整体土壤有机碳含量较高。(4)坡位和整地方式对整个小流域土壤有机碳含量有显著影响(p<0.05),地形对不同土地利用方式的有机碳含量影响不大,但整地方式对柠条灌丛地土壤有机碳含量有显著影响(p<0.05)。研究结果总体说明,以人工柠条种植为主的植被恢复方式促进了黄土丘陵区小流域土壤有机碳的积累,但小流域土壤有机碳空间分布及其变异性也受土地利用方式及其坡位和整地方式的重要影响。在实际区域土壤有机碳研究中有必要将整地方式和植被类型相结合进行综合研究。
- 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.
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备注/Memo
收稿日期:2019-05-13 修回日期:2019-06-06 资助项目:山西省自然科学基金(201601D021103); 国家自然科学基金(41401242) 第一作者:栗文玉(1993—),女,山西晋中人,硕士研究生,研究方向为恢复生态研究。E-mail:1508291695@qq.com 通信作者:刘小芳(1981—),女,山西榆次人,博士,讲师,硕士生导师,主要从事植物生态研究。E-mail:liuxiaofang04@163.com