基于典范对应分析的会仙岩溶湿地土壤理化性质与土壤酶活性关系研究  

Relationship between soil physicochemical properties and soil enzyme activities in Huixian karst wetland system based on Canonical Correspondence Analysis

作　　者：张莹[1,2] 刘畅[1,2] 宋昂[2] 靳振江[1] 李强[2] 

机构地区：[1]桂林理工大学环境科学与工程学院,广西桂林541004 [2]中国地质科学院岩溶地质研究所/国土资源部广西壮族自治区岩溶动力学重点实验室,广西桂林541004

出　　处：《中国岩溶》2016年第1期11-18,共8页Carsologica Sinica

基　　金：广西科学研究与技术开发计划(桂科合-14123001-13);广西自然科学基金(2015GXNSFGA139010和2014GXNSFCA118012);国家自然科学基金项目(41361054)

摘　　要：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。Wetland as an important ecological system plays an important change, which was affected by human activities. Therefore, non and the focus of many scientists. Huixiankarst wetland regulating water and climate wetland degradation becomes a global phenome system has the research base for comprehensive control of karst ecology and rocky desertification, belonging to original semi-disturbed wetland where in the past 20 years fertilizers have heen applied to paddy field and dry land. In order to reveal the relationship between soil physicochemical properties and soil enzyme activities in Huixian karst wetland system, soil sam ples from three kinds of lands （wetland, paddy field and dry land） were collected. To gain a better under-standing of the impact from the human and agricultural activities on the karst wetland system, a suitable e valuation method based on descriptive analysis, correlation analysis and canonical correspondence analysis （CCA） was employed. The highest content of soil organic carbon, total nitrogen, alkali-hydrolyzable nitro-gen, cation exchange capacity, exchangeable calcium and exchangeable magnesium appears in the wetland, followed by the paddy field and dry land, respectively; the lowest content of available phosphorus and potas slum occurs in the wetland. Therefore, the karst wetland system has an important function in the mainte nance of soil carbon sink and nutrition cycle. The content of available phosphorus and potassium in wetland was lower than those in the paddy field and dry land,which was affected by human and agricultural activities. The concentrations of urease, invertase, alkaline phosphatase and cellulose are also quite high in the wetland and show a strong spatial heterogeneity. By analyzing soil factors and soil enzymes confined to wetland and paddy field of the study area, the CCA biplot shows a trend of land degradation in this area, from which it can be seen that the wetland is influenced by human activities. Wetland was first cultivated as paddy field, later it was ev

关 键 词：湿地 土壤有机碳 土地利用方式 土壤酶 典范对应分析 

分 类 号：X142[环境科学与工程—环境科学]