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草业学报  2014 

石羊河下游退耕区次生草地自然恢复过程及土壤酶活性的变化

DOI: 10.11686/cyxb20140431, PP. 253-261

Keywords: 石羊河下游,退耕区,次生草地,植被自然恢复,土壤酶活性

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Abstract:

采用时空替代法,对石羊河下游不同年限(1,2,3,4,5,8,15,24和31a)退耕区次生草地自然恢复过程中群落特征和土壤过氧化氢酶、蔗糖酶、脲酶、磷酸酶活性及分布进行了调查与分析。结果表明,在退耕31a的次生草地植被自然演替过程中,9个样地的所有样方中出现34种植物,植被群落由一年生草本植物为建群种,多年生草本与个别灌木植物为伴生种,逐渐演替为单一的灌木群落,并表现出较强的连续性与递进性。此外,不同年限退耕区次生草地0~10cm,10~20cm,20~30cm及30~40cm土层中土壤酶活性均存在较大差异;土壤酶活性随土层深度的增加呈现减小趋势,并且表层土壤酶活性在4个层次的总酶活性中占有较大比例。随着退耕区次生草地演替时间的增加,土壤酶活性总的趋势与物种丰富度和多样性指数一样,随着退耕区次生草地植被的恢复呈波动式下降,土壤酶活性与植被的恢复是一个互动过程,它们之间存在着互相回馈的响应。另外,土壤酶活性的变化是极其缓慢的过程,并且与退耕最后一年种植的农作物存在相关性。

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