Research On The Effects Of The Irrigation By Papermaking Wastewater On Desert Ecological Forest

Based on the desert ecological forest irrigated by papermaking wastewater, the paper discusses the effects of desert ecological forest irrigated by papermaking wastewater on desert plant, desert siol and groundwater in the area of desert ecological forest.Through on the research of sodium ion content of desert plant in different irrigation yearsand in different vegetal part, the result shows that, sodium ion content of Tamarix chinensis, Elaeagnus angustifolia, Populus alba increase gradually with the increased irrigation years in the same vegetal part, and sodium ion content of the three plants are positive correlation between sodium ion content of soil. Sodium ion content of leaf in Tamarix chinensis Lour is higher than sodium ion content of root, so leaf has better sodium ion tolerance than root, leaf is the main site of sodium ion accumulation and excretion. Sodium ion content of leaf in Elaeagnus angustifolia is higher than sodium ion content of root, so leaf has better sodium ion tolerance than root, leaf is the main site of sodium ion accumulation. Sodium ion content of root in Populus alba is higher than sodium ion content of leaves, the root of Populus alba is a important site which can accumulate more sodium ion.Through on the research of soil physical property, soil chemical quality and soil nutrition element in different irrigation years and in different deepness of soil, the result shows that soil bulk density decreases gradually with the increased irrigation years in the same depth of soil, however, soil porosity increases. In comparison area (0 year), soil bulk density increases with the increased depth of soil, however, soil porosity decreases. Soil organic matter, total nitrogen and total phosphorus decrease gradually with the increased depth of soil in the same irrigation year; while increasing gradually with the increased irrigation years in the same depth of soil. Sodium ion and total salt content decrease gradually with the increased irrigation years in the same depth of soil, however, soil pH value increases. Soil pH value decreases gradually with the increased depth of soil in the same irrigation year, however, sodium ion and total salt content increases. Soil microbe increases remarkably with the increased irrigation years.Through on the research of groundwater in the area of desert ecological forest, the result shows that all indexes accord with the criterion of groundwater quality (III), and the groundwater is not polluted by wastewater irrigation. The research can provide theoretical guidance and practice basis for pulp and paper wastewater utilization.