南汇东滩湿地不同植被类型土壤酶时空分布特征

Spatiotemporal patterns of soil enzymes in different vegetation types in the Dongtan wetland of Nanhui

摘要:

依据植被空间分布的差异,研究2019年上海南汇东滩海三棱藨草植被区、互花米草植被区、互花米草-海三棱藨草植被混合区以及光滩区等4个不同区域土壤酶的差异及其影响因素。结果如下:南汇东滩海三棱藨草湿地中不同植被类型土壤酶活性不同,脲酶活性的大小顺序为海三棱藨草区>光滩区>互花米草区>混合区,土壤蔗糖酶活性的大小顺序为海三棱藨草区>互花米草区>混合区＞光滩区,碱性磷酸酶活性的大小顺序为光滩区>海三棱藨草区>混合区>互花米草区,过氧化氢酶的大小顺序为混合区>海三棱藨草区>互花米草区＞光滩区;混合植被区脲酶和蔗糖酶活性低于单一植被区,互花米草入侵降低了脲酶蔗糖酶活性,降低了海三棱藨草湿地的土壤肥力;不同植被类型区域土壤酶活性受环境因子影响不同,植被类型决定了土壤肥力进而影响了酶活力。

Abstract:

The spatial and temporal distribution of soil enzymes and their influencing factors were studied in the east wetland of Nanhui, Shanghai in 2019. Based on the differences in the spatial distribution of vegetation, the differences and influencing factors of soil enzymes in four different regions, including the Scirpus mariqueter area, Spartina alterniflora area, the mixed vegetation area of Spartina alterniflora area and Scirpus mariqueter area, and the area of bare tidal flats, were studied. The results are as follows: In the Dongtan wetland of Nanhui, the activities of different soil enzymes varied among different vegetation types, and the order of urease activity was Scirpus mariqueter area > bare beach area > Spartina alterniflora area > mixed area, the order of soil invertase activity was Scirpus mariqueter area > Spartina alterniflora area > mixed area > bare beach area, the order of alkaline phosphatase activity was bare beach area > Scirpus mariqueter area > mixed area > Spartina alterniflora area, and the order of catalase activity was mixed area > Scirpus mariqueter area > Spartina alterniflora area > bare beach area; The activities of urease and invertase in the mixed vegetation area were lower than those in the single vegetation area, and the invasion of Spartina alterniflora reduced the activities of urease and invertase, thereby reducing the soil fertility of the Dongtan wetland of Scirpus mariqueter; The activities of soil enzymes in different vegetation types were influenced by different environmental factors, and the vegetation type determined the soil fertility, which in turn affected the enzyme activity.