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某些农业措施对土壤酸化的影响

Keywords: 农业措施,土壤酸化,南澳大利亚

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Abstract:

用南澳大利亚Tarlee地区一个长期田间试验的土壤样品研究了轮作措施、氮肥施用和残茬管理对土壤酸化的影响。结果表明,所有处理均导致土壤pH下降,几种轮作方式加速土壤酸化的快慢顺序是:小麦-羽扇豆小麦-蚕豆>小麦-小麦>小麦-休闲。每公顷施用80kg铵态氮肥及残茬留田均加速了土壤酸化进程。试验期间,不同的田间处理下土壤的平均酸化速度在0.50—2.22kmolH+·hm-2·a-1范围内。与碳、氮循环有关的土壤和植物过程是加速该地区土壤酸化的主要原因。土壤酸化导致土壤交换性铝和CaCl2提取铝的量显著增加,并有可能对敏感植物产生毒害作用。

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