火烧对林地土壤理化性质的影响

Effect of Fire on the Physical and Chemical Properties of Forest Soil

为进行火烧迹地早期环境的管理，采用实地踏察和室内分析法，以山西省中条山三交林场23后的火烧迹地为研究对象，比较了未过火的油松林地与2种不同火烧程度（轻度火烧、重度火烧）油松林地的土壤含水量、容重、孔隙度、pH值、全氮、全磷等理化性质之间的差异。结果表明，轻度火烧后林地土壤A层（〈10cm）与B层（10～20cm）的含水量和容重分别提高了23．62％、55．97％和0．76％、8．53％，土壤A层的全氮却降低了11．11％，B层提高了25．00％，全磷A层与B层分别降低了20．00％、41．67％。重度火烧后林地土壤A层与B层的含水量分别降低了11．49％、6．66％，容重分别降低10．00％、6．20％，孔隙度、pH值、全氮、全磷却提高6．12％、2．08％，0．47％、0．95％，11．11％、16．67％，114．00％、100．00％。说明23后不同火烧强度的林地土壤与未过火的林地土壤之间仍然有差异。

For the burned area of early environmental management, With field researching and laboratory analysis, Sanjiao forest farm of Shah xi Zhongtiao Mountain after the 2a burned area as the research object, compared to control Pinus tabulaeformis forestland and 2 different burn degree Pinus tabutaeformis forestland （lightly burned,Severe burned） the difference between the soil moisture content, pH value and bulk density and porosity,total nitrogen and total phosphorus and other physical and chemical properties. The results show that Lightly burned forest soil layer A （〈10 cm） and layer B （10-20 cm） water content were increased 23.62% ,55.97% ,0.76% ,8.53% ,Soil layer A total nitrogen was decreased 11.11% ,B was increased 25%, soil layer A and B total phosphorus were increased 20.00%, 41.67% . Severe burned forest soil layer A and layer B water content were decreased 11.49%,6.66%, bulk density were decreased 10.00%, 6.20%, porosity, pH value, total nitrogen and total phosphorus were increased 6.12%, 2.08%, 0.47 % ,0.95 %, 11. 11%, 16.67 %, 114.00%, 100.00 %. There were still some differences between the forest soil and the non burned forest soil after 2 a.