中文摘要：

运用典范对应分析（CanonicalCorrespondenceAnalysis，CCA）对广西阳朔思的村铅锌矿尾砂坝坍塌后的污染农田土壤酶活性、土壤性质进行研究。结果表明：pH值、全铅和全锌是影响土壤其他因子（碱解氮、有机碳、速效磷、阳离子交换量、蔗糖酶、脲酶和碱性磷酸酶）的重要因素。该区污染土壤尽管经过当地农民长达逾40a的耕种，但土壤有机质、阳离子交换量、速效磷和碱解氮质量分数仍处于较低的水平，彼此之间的相关系数与其在CCA排序图中的夹角变化规律一致。土壤碱性磷酸酶活性与全锌质量分数呈正相关，因而在CCA排序图中，土壤碱性磷酸酶活性与全锌质量分数的夹角较小。尽管铅一锌污染物与蔗糖酶和脲酶的相关性不显著，但铅一锌污染物的存在造成蔗糖酶和脲酶活性的降低，因而在CCA排序图中，土壤中的铅一锌污染物与蔗糖酶和脲酶基本处于相反的两端，从而弥补相关分析结果信息量不足的弊端。鉴于CCA排序图能够直观展示土壤酶对重金属污染物的敏感强度以及土壤有机碳与养分循环物质之间的相互关系，因此可作为探索土壤因子内在联系的重要工具。

英文摘要：

Canonical Correlation Analysis（CCA） is a useful method to simplify large sets of environmental or abundance data and to identify and quantify their internal relationship of environmental factors. Normally, a larger data set always contains some unusual samples and redundant environmental variables which can be diagnosed with the primary CCA analysis. In this paper, based on Canonical Correspondence Analysis, 31 samples are collected to analyze the relationship between soil enzyme activity and soil properties in the heavy metal contaminated area due to the collapse of Pb-Zn tailing sand dam in Sidi Village, Yangshuo, Guangxi. The results show that the total Pb and total Zn in the topsoil are 21.25 and 5.31 times, respectively, greater than the environmental quality evaluation standards for farmland of edible agricultural products of China （HJ/T332-2006）, that indicates this area should not be as farmland anymore. Moreover, the calcium-rich and alkaline karst soil can neutralize the acidic and oxidised tailing sand.The topsoil pH ranges from 5.14 to 6.57 while the mean pH is 5.75. It proves that the soil pH, total Pb and total Zn are the key factors that can control other soil properties and soil enzyme activities. Due to the serious pollution from Pb-Zn tailing sand, the content of soil organic matter, cation exchange capacity, available phosphorus and available nitrogen are still at a relatively low level though this area was cultivated for more than 40 years by the local farmers, and the changing sequence of their correlation coefficient is similar to that of their size of vectors angels. According to the correlation analysis, the total lead and zinc have no correlation with the soil invertase and urease activities. The reason is that the soil invertase and urease activities are restrained to the low expressing condition by the Pb-Zn pollution. However, the complex inwardness about soil invertase and urease activities and Pb-Zn can be reflected on the CCA biplot. So, the soil invertase and urease activit