Effects of Different Land Use Types on Soil Enzyme Activity in Taohuayu Floodplain of the Henan Section of Yellow River
Three kinds of sampling sites of mudflat bare land,natural grassland and abandoned farmland were selected in Taohuayu floodplain of the Henan section of Yellow River.Soil samples at a depth of 0-10 cm were analyzed for the activity of four hydrolytic enzymes(N-acetyl-β-D-glucosaminidase,β-1,4-xylosidase,cellobiohydrolase,and leucine aminopeptidase)and one oxidase(peroxidase),as well as for the physicochemical properties of the soil under the three different land use types.The results showed that the mean activities of the four hydrolytic enzymes were 0.82 nmol/(h·g)for N-acetyl-β-D-glucosaminidase,0.83 nmol/(h·g)for β-1,4-xylosidase,1.69 nmol/(h·g)for cellobiohydrolase,and 3.24 nmol/(h·g)for leucine aminopeptidase.Compared to mudflat bare land and abandoned farmland soils,the activities of four hydrolytic enzymes were significantly higher in natural grassland soils.In contrast,peroxidase activity was highest in mudflat bare land soils,exceeding that in natural grassland and abandoned farmland soils.Correlation and redundancy analyses revealed that the activity of soil hydrolytic enzymes was significantly positively correlated with soil total carbon and total nitrogen contents,but significantly negatively correlated with soil pH.Peroxidase activity was positively correlated with soil ammonium and nitrate nitrogen contents.In the Henan section of Yellow River,natural restoration of floodplain promoted the activity of soil hydrolases and contributed to the improvement of soil quality.
soil enzyme activitydifferent land use typessoil total carbonfloodplainYellow River
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