三峡库区紫色土不同植被类型土壤抗蚀性能差异研究
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S157.1

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国家自然科学基金项目(42307422)、中央高校基本业务费项目(SWU-KQ22039)和西南大学研究生科研创新项目(SWUS23090)共同资助


Differences in Soil Erosion Resistance Between Different Vegetation Types of Purple Soil in the Three Gorges Reservoir Area
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National Natural Science Foundation of China(No. 42307422); Central University Basic Operating Expenses (No. SWU-KQ22039) and Postgraduate Research Innovation Project of Southwest university (No. SWUS23090)

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    摘要:

    土壤抗蚀性能反映了土壤对侵蚀的易损性或敏感性,是众多土壤侵蚀预测模型的重要参数。因此,量化不同植被类型下的土壤抗蚀性能对于区域土壤侵蚀的预测及土地利用格局的调整具有重要意义。基于此,本研究在三峡库区腹地忠县的秦岭小流域内选择库区7种典型植被类型,探究不同植被类型土壤抗蚀性能的差异及其主控因素。结果表明:不同植被类型的土壤抗蚀性能综合指数(Comprehensive Soil Erosion Resistance Index,CSRI)为0.05~0.72,其中玉米地最小,然后依次为柑橘地、草地、桉树林、马尾松林、灌木林和柏树林;且玉米地和柑橘地的CSRI显著小于其他植被类型(P<0.05),且与玉米地相比,柑橘地、草地、桉树林、马尾松、灌木林和柏树林的CSRI分别增大210%、407%、779%、816%、1095%、1217%。不同植被类型土壤抗蚀性能的差异与近地表土壤性质和植被特性密切相关,CSRI与土壤黏粒含量、总孔隙度、半分解枯落物蓄积量和根质量密度呈显著正相关关系(P<0.05),与有机质和水稳性团聚体含量呈极显著正相关关系(P<0.01),而与土壤容重呈显著负相关关系(P<0.05)。冗余分析结果表明土壤水稳性团聚体、黏粒和有机质含量是导致不同植被类型土壤抗蚀性能存在差异的主控因素,可以解释其64%的差异。路径分析表明,紫色土区不同植被类型土壤风化速率不同导致土壤黏粒含量存在差异,使得土壤水稳性团聚体含量及稳定性发生变化,进而影响土壤抗蚀性能。这与前人在其他土壤类型下认为的土壤抗蚀性能受控于植被特性间接影响土壤结构存在一定差异。

    Abstract:

    【Objective】 Soil erosion resistance reflects the vulnerability or sensitivity of soil to erosion, which is a critical parameter utilized for soil erosion prediction and is of significant importance for predicting regional soil erosion and adjusting land use patterns. Nevertheless, the potential effect as well as their driving mechanism of vegetation types on soil erosion resistance is still scarce in the purple soil of the Three Gorges Reservoir Area. Therefore, this study aimed to explore the potential effect of vegetation types on soil erosion resistance and decipher the influencing mechanisms of purple soil in the Three Gorges Reservoir area. 【Method】 Based on a full field investigation in the Qinling watershed of Zhongxian Country in the Three Gorges Reservoir area, seven typical vegetation types of the coniferous forest of Cupressus funebris Endl. (CF) and Pinus massoniana Lamb. (PM), broadleaf forest of Eucalyptus spp. (E), Citrus reticulata Blanco. (CR), shrub(S), grassland(G) and maize(M) were selected. Combined with the field sampling and indoor analysis, difference analysis, correlation analysis, redundancy analysis and path analysis, the differences as well as the main influencing factors of soil erosion resistance between different vegetation types were comprehensively analyzed. 【Result】 The comprehensive soil erosion resistance index(CSRI) varied from 0.05 to 0.72 between different vegetation types, among which maize had the minimum CSRI, then followed by CR, G, E, PM, S and CF. Moreover, CSRI varied significantly between different vegetation types with the CSRI of SL and CR being significantly lower than that of other vegetation types. Compared to M, CSRI of CR, G, E, PM, S, and CF increased by 210%, 407%, 779%, 816%, 1095% and 1217%, respectively. Differences in CSRI between different vegetation types was closely related to near-surface soil properties and vegetation characteristics. Correlation analysis indicated that CSRI was significantly positively correlated with organic matter content, water-stable aggregates content, total porosity, clay content, litter weight of the semi-decomposed layer, and root mass density, whereas significantly negatively correlated with bulk density (p<0.05). The results of redundancy analysis showed that water-stable aggregates, clay, and organic matter contents were the main factors controlling the differences in CSRI between different vegetation types, which could explain 64% of the total differences. However, the influencing mechanism of vegetation types on CSRI in purple soil was different from most previous studies carried out in other regions. Influenced by the formation process of purple soil, variation in CSRI between different vegetation types was dominantly controlled by clay content via its direct effect and indirect effect through increasing organic matter and water-stable aggregates contents. 【Conclusion】 Sloping land and orchard land are still the potential areas of soil erosion in the Three Georges Reservoir area since it has the minimum CSRI. Cupressus funebris Endl land can be promoted as soil and water conservation species in the reservoir area. The relevant research results can provide a scientific basis for the adjustment of land use structure and the selection of tree species for soil and water conservation, to realize the green and sustainable development of the Three Georges Reservoir area.

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冯滔,陈晓燕,朱平宗,潘振桦,杨澜,王定斌.三峡库区紫色土不同植被类型土壤抗蚀性能差异研究[J].土壤学报,2025,62(5):1259-1270. DOI:10.11766/trxb202407080276 FENG Tao, CHEN Xiaoyan, ZHU Pingzong, PAN Zhenhua, YANG Lan, WANG Dingbin. Differences in Soil Erosion Resistance Between Different Vegetation Types of Purple Soil in the Three Gorges Reservoir Area[J]. Acta Pedologica Sinica,2025,62(5):1259-1270.

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  • 收稿日期:2024-07-08
  • 最后修改日期:2024-12-05
  • 录用日期:2025-01-02
  • 在线发布日期: 2025-01-09
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