辉河湿地河岸带土壤养分与酶活性特征及相关性研究

以辉河湿地国家自然保护区内核心区为研究区,通过野外采样和室内分析相结合的方法,研究土壤养分和酶活性特征以及二者间的相关性。结果表明,随着距河岸距离的增大以及高程的增加,辉河湿地河岸带土壤理化性质发生明显的梯度变化,土壤全氮、全磷和有机质含量从岸边芦苇带到岸坡草本植物带呈先增大后下降的变化趋势,而土壤含水量呈下降趋势。同时,土壤酶活性(碱性磷酸酶、脲酶)也随着植被群落的陆向演替,呈现出一定的差异和变化规律,整体呈增大趋势,其活性与全氮、全磷、有机质呈极显著正相关(P0.01),与土壤含水量呈极显著负相关(P0.01)。综合分析表明,辉河湿地河岸带土壤酶活性不仅与土壤性质有关,与水文状况、微地形、植被演替也密切相关。

Characteristics and Correlation Analyses of Soil Nutrients and Enzyme Activities in The Riparian Zone of Hui River Wetland

Characteristics and correlation analyses of soil nutrients and enzyme activities in the middle reaches of Hui River Wetland National Nature Reserve were studied by using field sampling and laboratory analysis. The increase of distance from the Hui River and elevation gradient result in significant gradient changes of physical and chemical properties of soil in the riparian zone of the Hui River Wetland. The contents of total nitrogen (TN), total phosphorus (TP) and organic matter (SOM) increased first and then decreased from reed to herb zones, but soil moisture content (MC) continues to declined. The activities of alkaline phosphatase and urease showed increasing trends along the land succession of vegetation communities, and were significantly positive correlated with the values of TN, TP and SOM (P<0.01), but negatively to MC (P<0.01). The comprehensive analysis showed that soil enzyme activities in the riparian zone of Hui River Wetland are not only related to soil properties, but also closely related to hydrological conditions, micro topography and vegetation succession.