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喀斯特高原峡谷区不同植被类型的土壤抗蚀性
肖盛杨, 舒英格, 陈梦军
贵州大学 农学院, 贵州 贵阳 550025
摘要:
[目的]对喀斯特高原峡谷区不同植被类型土壤抗蚀性的变化特征进行分析,为该区水土保持和脆弱生态系统的恢复工作提供科学支撑。[方法]以喀斯特高原峡谷区5种植被类型土壤为研究对象,选取常用的11个理化指标,运用主成分分析法进行最佳指标筛选及土壤抗蚀性评价。[结果]与耕地相比,其他植被类型土壤抗蚀性均明显增强;土壤团聚状况和水稳性大团聚体含量显著增加(p ≤ 0.05);土壤黏粒含量有增加趋势,差异不显著(p>0.05);土壤分散率和团聚体破坏率显著减小(p ≤ 0.05)。主成分分析结果表明,黏粒含量、结构性颗粒指数、分散率、团聚状况、水稳性大团聚体含量和团聚体破坏率是评价该研究区土壤抗蚀性的最佳指标;土壤抗蚀性强弱顺序为:林地 > 林草间作地 > 荒草地 > 退耕还草地 > 耕地。[结论]楸树林自然恢复模式下土壤抗蚀性最优,建议该区域增加楸树林的面积,提高土壤抗蚀性,促进区域生态恢复和增强水土保持功能。
关键词:  土壤抗蚀性  植被类型  喀斯特  高原峡谷区  主成分分析
DOI:10.13961/j.cnki.stbctb.20190703.001
分类号:S157
基金项目:国家自然科学基金项目"喀斯特山区林草间作生态恢复过程中土壤质量演变规律及其评价:以贵州‘晴隆模式’为例"(31460133)
Soil Anti-erodibility Under Different Vegetation Types in Karst Plateau Gorge Region
Xiao Shengyang, Shu Yingge, Chen Mengjun
College of Agriculture, Guizhou University, Guiyang, Guizhou 550025, China
Abstract:
[Objective] The characteristics of soil anti-erodibility of different vegetation types were analyzed in order to provide scientific support for soil and water conservation and restoration of fragile ecosystem in the gorge of the karst plateau.[Methods] Field study was carried out in the karst plateau gorge region with five different vegetation types. Principal component analysis was used to identify the optimum indexes influencing soil anti-erodibility from 11 soil physical and chemical parameters and evaluate of the soil anti-erodibility.[Results] Compared with cultivated land, soil anti-erodibility of other vegetation types significantly enhanced, the content of water-stable macro-aggregate significantly decreased(p ≤ 0.05), soil clay content marginally increased(p>0.05), and percentage of soil dispersion and aggregate disruption significantly decreased(p ≤ 0.05). Results of principal component analysis showed that the content of clay, structural particle index, dispersionrate, agglomeration condition, water-stable macro-aggregate content and agglomerate destruction rate were optimal indicators for evaluating soil anti-erodibility. Based on comprehensive soil anti-erodibility index, the anti-erodibility was strongest for forest land, intercrop between forest and grass, natural grassland, grassland returned form farmland and cultivated land followed inorder.[Conclusion] The soil anti-erodibility was best under the natural recovery of Catalpa bungei forest. Increasing the area of Catalpa bungei forest was suggested to improve soil corrosion resistance, promote regional ecological restoration and enhance soil and water conservation.
Key words:  soil anti-erodibility  vegetation types  karst  plateau gorge region  principal component analysis