摘要
为探究地震前后对森林生态系统土壤物理性质的影响,通过对滑坡和未滑坡立地类型的林地进行土壤物理性质的比较,测定其土壤密度、土壤含水率、毛管孔隙、总孔隙等物理指标,揭示地震前后森林生态系统不同林地立地类型土壤物理性质。结果显示:(1)地震前后0~5 cm土层土壤密度无显著差异,而5~10 cm土层有显著差异,土壤密度均表现为地震后大于地震前;(2)地震前后不同土层的最佳含水量下限、土壤体积含水量、土壤贮含水量和土壤质量含水量均表现为显著差异,土壤体积含水量、土壤贮含水量均表现为震前大于震后,而最佳含水量和土壤质量含水量则相反;(3)地震前后的毛管持水量和最大持水量表现为显著差异,最小持水量则是0~5 cm土层为显著差异,5~10 cm无显著差异,排水能力与最小持水量相反,且从整体上看,震前大于震后;(4)地震前后的毛管孔隙均表现为显著差异外,其余则是显著不一,总孔隙、非毛管孔隙和土壤通气度表现一致(震前0~5 cm土层小于震后,震后5~10 cm小于震前),而毛管孔隙则均为震前大于震后。
To investigate the influence of earthquakes on the soil physical properties of forest ecosystems,this study compared the soil physical characteristics of forested areas with and without landslides before and after seismic events.Physical indicators such as soil bulk density,soil moisture content,capillary porosity,and total porosity were measured to reveal the changes in soil physical properties across different forest land types in forest ecosystems.The results indicate the following:(1)No significant difference was observed in soil bulk density within the 0~5 cm soil layer before and after the earthquake;however,a significant difference was noted in the 5~10 cm soil layer.In both cases,soil bulk density was greater post-earth⁃quake than pre-earthquake.(2)Significant differences were observed in the lower limit of optimal water content,volumetric soil water content,soil storage water content,and gravimetric soil water content across different soil layers before and after the earthquake.Volumetric soil water content and soil storage water content were higher pre-earthquake than post-earthquake,whereas optimal water content and gravimetric soil water content showed the opposite trend.(3)Capillary water holding capacity and maximum water holding capacity exhibited significant differences before and after the earthquake.Minimum water holding capacity showed significant variation only in the 0~5 cm soil layer but not in the 5~10 cm layer.Drainage capacity was inversely related to minimum water holding capacity and was generally greater pre-earthquake than post-earth⁃quake.(4)Significant differences were observed in capillary porosity before and after the earthquake,while other parameters also showed significant variation.Total porosity,non-capillary porosity,and soil aeration were consistent(the 0~5 cm soil layer had smaller values pre-earthquake than post-earthquake,and the 5~10 cm soil layer had smaller values post-earthquake than pre-earthquake),whereas capillary porosity was consistently higher pre-earthquake than post-earthquake.
作者
张细林
高雨菲
李勋
ZHANG Xilin;GAO Yufei;LI Xun(Key Laboratory of Ecological Protection and Characteristic Industry Cultivation in Hengduan Mountain Area at Sichuan Minzu College,Kangding,Sichuan 626001)
出处
《现代农业研究》
2025年第6期78-83,共6页
Modern Agriculture Research
基金
甘孜州科技计划项目资助“‘9.5’泸定地震受损林地植被生态修复和碳汇潜力提升研究”(项目编号:220030)
横断山区生态保护与特色产业培育四川省高等学校重点实验室资助。
关键词
地震
土壤
物理性质
森林生态系统
earthquake
soil
physical properties
forest ecosystem
