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以裸地为对照,对黄河三角洲小开河引黄灌区输沙干渠两侧的白蜡林、棉田及杂草地3种植被类型改良土壤盐碱程度、土壤容重和孔隙度状况、土壤养分含量及土壤呼吸速率等参数进行比较分析。结果表明:①植被建设具有降盐效应,棉田、白蜡林、杂草地含盐量均值分别比裸地下降66.7%,52.4%,16.7%,表层低于20-40cm土层。②植被建设使土壤容重减小、孔隙度增大,土壤容重均值表现为白蜡林<杂草地<棉田<裸地,总孔隙度则与之相反,对土壤表层的改良效果好于20-40cm土层。③不同植被类型土壤有机质及速效养分含量均有提高,白蜡林、棉田、杂草地土壤有机质含量均值分别是裸地的2.72,2.03,1.75倍,土壤表层高于20-40cm土层。④白蜡林、杂草地、棉田的土壤呼吸速率日动态呈现单峰曲线,土壤呼吸速率日均值及日变幅均表现为白蜡林>棉田>杂草地>裸地,其中白蜡林、棉田、杂草地土壤呼吸速率日均值分别是裸地的8.01,6.47,3.36倍。
Based on the bare land, the three types of vegetation, including white wax forest, cotton field and weed, on both sides of the sediment discharge canal in the Yellow River Irrigation Area of the Yellow River Delta improved soil salinity, soil bulk density and porosity, soil nutrient content and soil Respiratory rate and other parameters for comparative analysis. The results showed that: (1) The vegetation construction had the effect of reducing salt. The average salt content of cotton, white wax forest and weed decreased 66.7%, 52.4% and 16.7% respectively compared with bare land, and the surface layer was lower than 20-40cm soil layer. (2) Vegetation construction reduced the soil bulk density and porosity, and the average soil bulk density showed white forest cotton field> weeds> bare land, The average soil respiration rate of weeds was 8.01,6.47,3.36 times that of bare land respectively.