Effect of Untreated and Recycled Wastewater Irrigation from Rural Areas on Forest Plant Growth and Soil Physicochemical Properties
To investigate the effects of untreated and recycled sewage irrigation on plant growth and soil qual-ity in rural areas,excellent fast-growing tree species were selected as subjects.Eight types of artificial forests include:Populus×euramericana cv.'74/76',Populus×euramericana cv.'2001',P.deltoides'Lux(I-69/55)'×P.deltoides'Shanhaiguan',Salix×jiangsuensis'J172',Salix×jiangsuensis'J799',Hybrid Broussonetiapa pyrifera'Zhongke1',Hybrid Broussonetiapa pyrifera'Zhongke2',Hybrid Broussonetiapa pyrif-era'Zhongke3'.The rural domestic sewage,reclaimed water,and groundwater were irrigated separately,and changes in the physical properties of soil(bulk density,soil porosity,water content)and chemical properties(organic matter,total nitrogen,total phosphorus,available potassium,pH value,chloride ion,exchangeable sodium)were statistically analyzed.The results indicated that soil bulk density was minimized,porosity was im-proved,and water content was highest under irrigation with treated wastewater.The original sewage had the high-est levels of soil organic matter,total nitrogen,total phosphorus,chloride ions,and exchangeable sodium con-tent,followed by reclaimed water and groundwater.The original sewage also had the highest levels of soil availa-ble potassium,followed by groundwater and reclaimed water.Among the three tree species tested,poplars exhib-ited the highest growth and soil organic matter content.Fir trees had the highest content of total nitrogen,availa-ble potassium,and chloride ions in the soil,while willows had the highest exchangeable sodium content.The soil pH was weakly alkaline in all treatments.Under reclaimed water irrigation,significant improvements in growth and soil quality were observed in poplar,willow,and fir trees,making them ideal choices for promoting and applying the"biological ecological"combination in agricultural wastewater treatment.
Rural domestic sewageReclaimed waterForest irrigationPhysical and chemical properties of soil
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