在黄河(河南段)桃花峪滩区选取滩涂裸地、天然草地和弃耕农田3种类型的采样地，以0~10 cm深度土壤为研究对象，分析土壤中的4种水解酶(β-1,4-乙酰-葡糖胺糖苷酶、β-1,4-木糖苷酶、纤维素二糖水解酶和亮氨酸氨基肽酶)和1种氧化酶(过氧化物酶)的活性，以及3种不同土地利用方式的土壤理化性质。研究结果表明，4种土壤水解酶(β-1,4-乙酰-葡糖胺糖苷酶、β-1,4-木糖苷酶、纤维素二糖水解酶和亮氨酸氨基肽酶)活性的平均值分别为0.82 nmol/(h·g)、0.83 nmol/(h·g)、1.69 nmol/(h·g)和3.24 nmol/(h·g)，且4种水解酶活性都在天然草地土壤中相对最高，显著高于滩涂裸地和弃耕农田土壤；相反，土壤过氧化物酶活性在滩涂裸地土壤中相对最高，高于天然草地和弃耕农田土壤；相关分析和冗余分析结果表明，土壤水解酶活性与土壤全碳和全氮含量显著正相关，而与土壤pH显著负相关，过氧化物酶活性与土壤铵态氮和硝态氮含量正相关。在黄河中下游地区，滩涂自然恢复促进提高土壤水解酶活性，有助于土壤质量的提升。

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.