桂西南地区43年生米老排土壤理化性质研究

Study on the Physical and Chemical Properties of 43-Year-Old Mytilaria laosensis Soil in Southwest Guangxi

探明桂西南地区43年生米老排土壤理化性质,为南亚热带气候区米老排人工林土壤改良及可持续经营提供科学依据。以米老排近熟林为对象,探究了其不同土层深度土壤容重、有机质含量等20个土壤物化性质的差异。结果表明:试验地土壤容重达到了适宜作物生长的标准,具有较强的持水性能,上层疏松下层紧实。按照全国第二次土壤普查养分分级表,试验地属于强酸性土壤,有机质含量达到三级水平,全氮、全磷和全钾分别达到三级水平、六级水平和五级水平,碱解氮、有效磷、有效钾分别达到四级水平、六级水平和六级水平,交换性钙、镁含量属于中低含量水平,有效铜、锌和硼含量均处于严重缺乏等级。试验地B最大持水量、全氮、全磷、全钾、有机质、碱解氮、有效磷、有效钾、交换性钙含量平均值均高于试验地A。米老排人工林土壤透水性、透气性较好,土壤容重达到了适宜作物生长的标准,具有较强的土壤增肥作用,能够在酸性土壤正常生长,适宜在桂西南地区广泛发展。

The physical and chemical properties of 43-year-old Mytilaria laosensis soil in southwest Guangxi were investigated,which provided scientific basis for soil improvement and sustainable management of Mytilaria laosensis in southern tropical climate.The differences in 20 soil physicochemical properties are explored such as soil bulk density and organic matter content at different soil depths in the near mature forest of Mytilaria laosensis.Results:The soil bulk density of the experimental site has reached the standard suitable for crop growth,with strong water holding capacity,and the upper layer is loose and the lower layer is compact.According to the nutrient grading standards of the second national soil survey,the experimental site belongs to strongly acidic soil,with organic matter content reaching level three,total nitrogen,total phosphorus,and total potassium reaching level three,level six,and level five,respectively.Alkaline hydrolyzed nitrogen,available phosphorus,and available potassium reach level four,level six,and level six,respectively.The exchangeable calcium and magnesium content belongs to the medium to low content level,and the available copper,zinc,and boron content are all in a serious deficiency level.The maximum water capacity,total nitrogen,total phosphorus,total potassium,organic matter,alkali hydrolyzed nitrogen,available phosphorus,available potassium,and exchangeable calcium contents of test site B were all higher than those of test site A.The Mytilaria laosensis artificial forest has good soil permeability and permeability,and the soil bulk density meets the standards suitable for crop growth.It has a strong soil fertility effect and can grow normally in acidic soil,making it suitable for widespread development in the southwestern region of Guangxi.