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对徐州石灰岩山地4种不同植被类型中的两种土壤活性有机碳的含量进行研究,结果表明:微生物生物量碳(SMBC)、土壤水溶性有机碳(WSOC)的含量在针阔混交林、落叶阔叶林、针叶林、灌草地4种不同植被群落中均随灌草地向林地变化而呈现上升趋势。其中,微生物生物量碳在4种不同植被群落中的变化趋势为针阔混交林>落叶阔叶林>针叶林>灌草地;水溶性有机碳在4种不同植被群落中的变化趋势为落叶阔叶林>针阔混交林>针叶林>灌草地。两种土壤活性有机碳与总有机碳、全氮和pH值等主要生态因子的相关性均达到显著水平或极显著水平。在徐州石灰岩山地地区,与当地大面积栽植的侧柏相比,落叶阔叶林和针阔混交林可作为更好的替代树种,能够有效地改善土壤肥力状况。
The contents of soil active organic carbon in four different types of vegetation in limestone mountainous area of Xuzhou were studied. The results showed that the content of soil microbial biomass carbon (SMBC) and soil water-soluble organic carbon (WSOC) The broadleaved forest, coniferous forest and shrub-grassland all showed an upward trend with the change of shrub-grassland to the forestland in four different vegetation communities. Among them, the trend of microbial biomass carbon in four different vegetation communities was coniferous-broadleaved mixed forest> deciduous broad-leaved forest> coniferous forest> shrub-grassland. The change trend of water-soluble organic carbon in four different vegetation communities was deciduous Broad-leaved forest> Mixed coniferous and broad-leaved forest> Coniferous forest> Shrub land. The correlations between soil active organic carbon and main ecological factors such as total organic carbon, total nitrogen and pH reached significant level or extremely significant level. In the limestone mountain area of Xuzhou, deciduous broad-leaved forest and coniferous-broad-leaved mixed forest can be used as better alternative tree species and can effectively improve soil fertility compared with the large-scale planting of oriental arborvitae.