摘要
为了评估云南橡胶林土壤质量,以云南省河口、瑞丽、景洪3个典型橡胶产区5个不同林龄段(幼、中、近熟、成熟和过熟林)橡胶林土壤为研究对象,采集并分析0～10、11～20 cm和21～40 cm深度的土壤样品.将土壤容重、含水量、硝态氮、铵态氮、全氮、速效磷、全磷、速效钾、全钾、pH、有机质、脲酶、纤维素酶、过氧化氢酶、蔗糖转化酶等作为评价指标,运用主成分分析、相关性分析,结合Norm值筛选,构建土壤质量综合指数(SQI),对土壤质量进行定量评价.结果表明,土壤容重、硝态氮、全氮、全磷、全钾、有机质、脲酶7项指标进入最小数据集;SQI-TDS的范围0.29～0.56,平均值0.39,变异系数14.67%;SQI-MDS的最小值0.20,最大值0.53,平均值0.34,变异系数18.88%;相关性分析显示,2种评价结果具有较好的相关性.土壤质量综合指数随着定植年限的增长呈略微先降低后增加的趋势;3个植胶区土壤质量以三级和四级为主,土壤质量排序为景洪>河口>瑞丽.
Abstract
In order to evaluate soil quality under rubber plantations in Yunnan Province,soil samples of rubber plantations with different growth stages(young,medium,near-mature,mature,and overmature)were collected from different layers(0-10,11-20,and 21-40 cm)in three typical rubber planting regions of Yunnan Province,i.e.,Hekou,Ruili,and Jinghong.Soil bulk density,water content,nitrate nitrogen,ammonium nitrogen,total nitrogen,available phosphorus,total phosphorus,available potassium,total potassium,pH,organic matter,urease,cellulase,catalase and sucrose invertase were used as the indi-ces of the whole data set(TDS).Principal component analysis(PCA),correlation analysis and Norm value were used to obtain the minimum data set and calculate soil quality index(SQI)for quantitative evaluation of soil quality.The results showed that 7 indices were allowed to enter the minimum data set,including soil bulk density,nitrate nitrogen,total nitrogen,total phosphorus,total potassium,organic matter,and urease.The value of SQI-TDS ranged from 0.29 to 0.56,with an average of 0.39 and a coefficient of variation of 14.67%.The minimum and maximum values of SQI-MDS were 0.20 and 0.53,respectively,the mean value was 0.34 and the coefficient of variation was 18.88%.The correlation of the two evaluation results was good.The SQI decreased slightly and then increased with the growth of rubber plantations.The soil quality in the three rubber planting areas belonged to the level 3 and 4,and the soil quality in three regions was in the order of Jinghong>Hekou>Ruili.
维普
万方数据