| 摘要: |
| 【目的】研究典型喀斯特地区不同龄级马尾松林下土壤抗蚀性，筛选表征喀斯特地区马尾松林土壤的最适抗蚀指标，为喀斯特地区水土保持和生态可持续发展提供理论支持。【方法】在贵州省贵阳市花溪区选择不同龄级（幼龄林（SY）、中龄林（SZ）、成熟林（SC））的马尾松林，测定了不同龄级马尾松林土壤基本理化性质、团聚体组含量、机械组成和土壤抗蚀性指标，最后选取有机质含量、抗蚀指数、团聚体破坏率、团聚状况、团聚度、分散率、分散系数、湿筛平均重量直径、湿筛平均几何直径、体积质量、干筛团聚体含量、水稳性团聚体含量、毛管持水量13个指标，采用主成分分析方法探究各龄级马尾松林土壤的最优抗蚀指标和综合抗蚀指数。【结果】（1）不同龄级马尾松林土壤理化性质存在明显差异，其中土壤平均有机质含量由大到小排序为成熟林（94.49 g/kg）>中龄林（63.78 g/kg）>幼龄林（55.29 g/kg）。(2)马尾松林土壤湿筛平均重量直径、团聚状况和水稳性团聚体含量均随土层深度的增加而下降，表现为成熟林>中龄林>幼龄林。(3)主成分分析发现，有机质、水稳性团聚体含量、抗蚀指数、团聚度、团聚状况和湿筛平均重量直径为最适抗蚀指标。(4)不同龄级马尾松林综合抗蚀指数表现为成熟林（8.04）>中龄林（－0.29）>幼龄林（－7.75）。【结论】筛选出了表征喀斯特地区马尾松林土壤抗蚀性的最适指标。随着喀斯特地区马尾松林龄的增加，土壤有机质、湿筛平均重量直径和水稳性团聚体含量均增大，团聚状况得到改善，土壤抗蚀性增强。 |
| 关键词: 马尾松林 土壤抗蚀性 喀斯特地区 |
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| 基金项目:国家自然科学基金项目（41807336）；贵州省科技计划项目（黔科合基础［2020］1Y189，黔科合LH字［2017］7345号，黔科合平台人才［2018］576919）；贵州师范大学2016年博士科研启动项目；贵州省世界一流学科建设计划项目：喀斯特生态环境学科群（黔教科研发［2019］125号） |
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| Soil anti-erodibility under Pinus massoniana forest at different ages in typical Karst area |
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ZHANG Jun,XIE Xujiao,WEI Xiaocha,et al
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| Abstract: |
| 【Objective】The soil anti erodibility of Pinus massoniana forests at different ages in typical Karst areas was studied and the optimal anti-erodibility indexes were selected to provide support for soil and water conservation and ecological sustainable development in Karst areas.【Method】Pinus massoniana forests with different ages (young forest (SY),half mature forest (SZ) and mature forest (SC)) were selected in Huaxi District,Guiyang,Guizhou Province.Basic physical and chemical properties,aggregate group contents,mechanical composition and anti-erodibility indexes of Pinus massoniana forests at different ages were measured.Then,13 indexes including organic matter content,anti-erodibility index,percentage of aggregate destruction,aggregation condition,degree of aggregation,dispersity,dispersion coefficient,wet sieve average weight diameter,geometric mean diameter of wet sieve,volume mass,aggregate content of dry sieve,water stable aggregate content and capillary water holding capacity were selected,and principal component analysis was used to explore the optimal soil anti erodibility indexes and comprehensive anti-erodibility index of Pinus massoniana forests at different ages.【Result】(1) There were significant differences in soil physical and chemical properties of Pinus massoniana forests at different ages,and average soil organic matter content was in the order of mature forest (94.49 g/kg)>half mature forest(63.78 g/kg)>young forest (55.29 g/kg).(2) The wet sieve average weight diameter,aggregation condition and water stable aggregate content of soil under Pinus massoniana forests decreased with the deepening of soil layer,and they were in order of mature forest>half mature forest>young forest.(3) Principal component analysis showed that organic matter content,water stable aggregate content,anti-erodibility index,degree of aggregation,aggregation condition and wet sieve average weight diameter were optimal soil anti-erodibility indexes.(4) The comprehensive anti-erodibility index of Pinus massoniana forests of different ages was in the order of mature forest (8.04)> half-mature forest (－0.29)>young forest (－7.75).【Conclusion】The optimal indexes of soil anti-erodibility of Pinus massoniana forests in Karst areas were selected.With the increase of forest age,soil organic matter,wet sieve average weight diameter and water stable aggregate content increased,the aggregation condition improved,and the soil anti-erodibility was enhanced. |
| Key words: Pinus massoniana forest soil anti-erodibility Karst areas |
