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武汉九峰国家森林公园不同林分类型土壤质量评价

Assessment on Soil Quality of Different Stand Types in Wuhan Jiufeng National Forest Park

  • 摘要: 以武汉市九峰国家森林公园内马尾松林、枫香林、栓皮栎林、针阔混交林、常绿阔叶混交林5种典型森林类型为研究对象,分析不同林分类型土壤理化性质特征及差异,并利用土壤质量综合指数评价土壤质量。结果表明:武汉九峰国家公园不同林分类型的土壤pH在10~20、>40 cm土层,有机质、水解氮在20~40、>40 cm土层,全氮、全磷在0~10、10~20、20~40 cm土层,有效磷在0~10 cm土层间差异显著;不同林分4个土层的土壤含水量、土壤容重、最大持水量、毛管持水量、毛管孔隙度、总孔隙度及全钾、速效钾均差异显著。不同类型森林土壤综合质量指数由高到低表现为针阔混交林>枫香林>栓皮栎林>常绿阔叶混交林>马尾松林,针阔混交林和阔叶林土壤质量优于针叶林,落叶阔叶林优于常绿阔叶林。建议适度提高落叶阔叶树种比例,加强林下植被管理,并合理调节土壤酸碱度,以改善武汉城市森林的土壤质量。

     

    Abstract: The evaluation of soil quality in urban forests is of great significance for the construction and sustainable management of urban forest vegetation. Five typical urban artificial forests (including Pinus massoniana forest, Liquidambar formosana forest, Quercus variabilis forest, coniferous and broad-leaved mixed forest, and evergreen broad-leaved mixed forest) were selected as the research objects in Jiufeng National Forest Park, Wuhan City. The differences of soil physical and chemical properties and their relationships among different stand types and soil layers were analyzed. The integrated soil quality indexes of different stand types were also evaluated. The results showed that the physical and chemical properties of urban forest soil in Wuhan are significantly influenced by stand types. The differences were significant at the pH value in 10~20 cm and >40 cm, organic matter and hydrolytic nitrogen in 20~40 cm and >40 cm, total nitrogen and total phosphorus in 0~10 cm, 10~20 cm, and 20~40 cm, and available phosphorus in 0~10 cm soil layers (P<0.05). Soil moisture content, soil bulk density, maximum water holding capacity, capillary water holding capacity, capillary porosity, total porosity, total potassium and available potassium in all of the four soil layers among different stand types also showed significant differences (P<0.05). The comprehensive ranking is as follows: coniferous and broad-leaved mixed forest > Liquidambar formosana forest > Quercus variabilis forest > evergreen broad-leaved mixed forest > Pinus massoniana forest. The soil quality of coniferous and broad-leaved mixed forest and the broad-leaved forests' are superior to the coniferous forest's, deciduous broad-leaved forest is superior to evergreen broad-leaved forest. Moderately increasing the proportion of deciduous broad-leaved plants in forest stands, managing and maintaining understory vegetation, and regulating soil acidity and alkalinity will be beneficial for improving the soil quality of urban forests in Wuhan.

     

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