论文部分内容阅读
为揭示湿地退化过程中土壤理化性质与土壤酶活性关系,文章以广西桂林市会仙岩溶湿地系统中的湿地、稻田和旱地三种土地利用类型的表层土壤为研究对象,运用描述性分析、相关性分析和典范对应分析(Canonical Correspondence Analysis,CCA)等方法来探讨它们之间的内在联系。结果表明:土壤理化性质除有效磷、速效钾外,土壤有机碳、全氮、碱解氮、阳离子交换量、交换性钙、交换性镁的质量分数均表现为湿地>稻田>旱地,说明岩溶湿地在维持土壤碳库以及营养元素方面具有重要的作用。会仙湿地中有效磷、速效钾的质量分数低于稻田和旱地,根本原因在于人类活动以及农业活动的影响。除蛋白酶外,脲酶、蔗糖酶、碱性磷酸酶和纤维素酶的质量分数均在湿地中最高,与土壤理化性质的质量分数在湿地中较高相吻合,并表现出较强的空间异质性。进一步分析典范对应分析图,可知会仙岩溶湿地受人类活动影响较大,湿地首先被开垦为稻田,随着土壤自然肥力的下降最后被开垦成旱地,因此在生态演替不可逆转的条件下,将稻田作为人工湿地加以保护是维持湿地生态环境最佳的土地利用方式。
In order to reveal the relationship between soil physical and chemical properties and soil enzyme activities during the process of wetland degradation, the paper studied the topsoil with wetland, paddy field and dry land in Huixian Karst Wetland System in Guilin, Guangxi as the research object. By using descriptive analysis, Sexual analysis and Canonical Correspondence Analysis (Canonical Correspondence Analysis, CCA) and other methods to explore the intrinsic relationship between them. The results showed that soil physical and chemical properties except soil available phosphorus and available potassium, soil organic carbon, total nitrogen, alkaline hydrolysis nitrogen, cation exchange capacity, exchangeable calcium, exchangeable magnesium mass fraction showed wetland> paddy field> dry land, indicating karst Wetlands play an important role in maintaining soil carbon stocks and nutrients. The content of available phosphorus in wetlands is lower than that in paddy field and dry land, and the basic reason is the influence of human activities and agricultural activities. In addition to protease, the mass fraction of urease, invertase, alkaline phosphatase and cellulase were the highest in the wetlands, which was consistent with the higher soil moisture content and the higher physical and chemical properties Sex. Further analysis of the canonical correspondence map shows that Huixian karst wetland is greatly affected by human activities. The wetland was first reclaimed as paddy field and finally was reclaimed into dry land with the decline of soil natural fertility. Therefore, under the condition of irreversible ecological succession, The protection of paddy fields as constructed wetlands is the best way to maintain the ecological environment of the wetlands.