Characteristics of runoff water quality change in the sprout forest and mixed reconstruction forest of Eucalyptus urophylla
[Objective]To explore the change characteristics of runoff quality on the slope of pure forest and mingled forest of Eucalyptus,reveal the objective laws of water quality changes,and provide an important scientific basis for correctly answering and solving the water quality problem of Eucalyptus plantation and realizing the sustainable development of Eucalyptus plantation.[Method]Eucalyptus,Eucalyptus×Manglietia glauce(ribbon mixing,interrow mixing and interplant mixing)and M.glauce were selected as the research objects,and the key factors affecting forest water quality were selected.The changes of runoff quality under different cultivation modes were compared by using the method continuous monitoring and laboratory analysis.[Result]1)The pH,COD,and BOD5 of the runoff on the slope of each experimental plot met the requirements of standard for irrigation water quality(GB 5084-2021)for pH(5.5-8.5),COD(＜150.00 mg·L-1)and BOD5(＜60.00 mg·L-1)concentrations.2)The tannin content(7.77 mg·L-1)in the runoff of Eucalyptus plantation slope was significantly higher than that of other plots,which was 6.4 times higher than the blank control plot(1.22 mg·L-1).Eucalyptus×M.glauce can effectively reduce the tannin content in slope runoff,with interrow mixing mode is the most effective.3)The humic acid content in the slope runoff of Eucalyptus plantation and M.glauce were higher than that of mixed forests,meanwhile Eucalyptus plantation and M.glauce ribbon mixing mode was more conducive to the reduction of humic acid content in the slope runoff.[Conclusion]Eucalyptus mixed planting mode can effectively reduce the content of tannins and humic acids in slope runoff while ensuring the main indicators of water quality meet the standards,and alleviate its further impact on soil acidity,alkalinity and microorganisms.
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