植被类型对滨海湿地土壤酶活性的影响研究  

Effects of Vegetation Type on Soil Enzyme Activities in Coastal Marsh

作　　者：黄利东[1] 汪丽军 王月[3] 

机构地区：[1]南京信息工程大学应用气象学院,江苏南京210044 [2]内蒙古科尔沁右翼前旗农业技术推广中心,内蒙古科尔沁右翼前旗137713 [3]沈阳农业大学土地与环境学院,辽宁沈阳110866

出　　处：《土壤通报》2015年第6期1447-1452,共6页Chinese Journal of Soil Science

基　　金：国家自然科学基金项目(41201515)资助

摘　　要：在盐城滨海湿地采集植被为互花米草(Spartina alterniflora)、海三棱藨草(Scirpus mariqueter)、芦苇(Phragmites australis)、碱蓬(Suaeda salsa)和光滩的土壤样品22个,分别测定了β-葡萄糖苷酶、脲酶和磷酸酶的活性。结果显示,植被覆盖下的土壤β-葡萄糖苷酶、脲酶和磷酸酶的活性均高于光滩土壤,且不同类型植被下土壤之间酶活性也有一定的差异。同一类植被覆盖下,不同样点间土壤酶活性也存在很大的差异。相关分析表明,β-葡萄糖苷酶和脲酶活性与有机质和全氮存在显著正相关;磷酸酶活性与有机质和有机质/磷呈显著正相关。有机质是影响酶活性的主要限制性物质,地上部生物量相对较大的植物(如互花米草)在提高有机质方面表现出巨大潜力,不仅可以增加土壤酶活性,还能促进养分循环和利用。Activities of β- glucosi dase, urease and alkaline phosphatase were analyzed in 22 soils sampled from a coastal marsh located in Yancheng city, Jiangsu Province with different vegetative cover(Spartina alterniflora, Scirpus mariqueter, Phragmites australis, Suaeda salsa and bare flat). Basic properties of soils were also determined to compare with enzyme activity. The results demonstrate that(i) enzyme activity was higher in vegetated soils than those in bare soils;(ii) enzyme activity varied greatly between different sites, even under the same vegetation cover. Regression analysis reveals that all the three enzyme activities were markedly related with organic matter(OM). However, theβ- glucosidase and urease activities were not significantly related with OM/N(an index of microorganism's substrate)and no significant linear relationship between phosphatase activities and total phosphorus was observed in these soils.This study concluded that OM was the most key factor in regulating enzyme activities. Owing to its huge biomass and densities, Spartina alterniflora displayed the greatest potential for carbon input, thus enhancing the enzyme activity and facilitating nutrient cycling in this region.

关 键 词：植被 湿地 酶活性 分布特征 

分 类 号：S154.2[农业科学—土壤学]