Development and validation of numerical indexes integrating enzyme activities of soils
Development and validation of numerical indexes integrating enzyme activities of soils
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DOI：
10.1016/j.soilbio.2005.11.021
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发表时间：
2006-07
影响因子：
9.7
通讯作者：
E. Puglisi;A. D. Re;M. Rao;L. Gianfreda
中科院分区：
文献类型：
--
作者：
E. Puglisi;A. D. Re;M. Rao;L. Gianfreda
提出并验证了基于土壤酶活性的三个数字指数，可以区分改变的土壤和未改变的土壤。在三个不同的农业地点测量了七种酶，这些地点受到城市和工业废物污染（地点 1）、没有轮作或有机肥料的集约耕作（地点 2）以及微咸水灌溉（地点 3）。在每个邻近地点，对未改变的土壤进行取样并作为对照土壤进行分析。这三个指数是利用两个站点的数据通过典型判别分析（CDA）开发的，而第三个站点则保留作为独立测试。第一个指数是使用所有研究的酶活性建立的；第二，仅使用最具辨别力的酶活性；第三个是针对已发表的论文中的数据进行测试而开发的，这些论文涉及不同管理制度下土壤中的酶测量。当应用于第三个地点的数据集（即未用于指数开发的数据集）时，这三个指数能够区分改变的土壤和控制土壤。当针对已发布的数据进行测试时，第三个指数通常能够通过较高的指数得分来区分改变的土壤和对照。该指数在大多数情况下都是成功的：它始终能够根据报告的改变程度对土壤进行分类。我们的结果证实，酶活性是土壤变化的合适指标，并且可以有效地整合以开发适合监测不同条件下土壤状况的土壤变化指数。
Three numerical indexes, based on soil enzyme activities, which can discriminate between altered and unaltered soils, are presented and validated. Seven enzymes were measured at three different agricultural sites subjected to contamination by municipal and industrial wastes (site 1), intensive cultivation without either crop rotation or organic fertilization (site 2), and irrigation with brackish water (site 3). At each site neighbouring, unaltered soils were sampled and analysed as control soils. The three indexes were developed by means of canonical discriminant analysis (CDA) using data from two sites, while the third site was kept aside as an independent test. The first index is built up using all of the enzyme activities studied; the second, using the most discriminating enzyme activities only; and the third was developed for testing against data in published papers that deal with enzyme measurements in soils under different management regimes. The three indexes were able to discriminate between altered and control soils when applied to the data set from the third site, i.e., that not used for index development. When tested against published data, the third index was usually able to discriminate altered soils from controls by higher index scores. This index was successful in most cases: it was consistently able to classify soils according to their reported degree of alteration. Our results confirm that enzyme activities are suitable indicators of soil alteration and may be usefully integrated to develop soil alteration indexes suitable for monitoring soil status under different conditions.