摘要:土壤盐分是限制植物生长和农业生产力的主要环境因素之一。本研究采用原位修复方法,在不同盐度 (g盐kg-1土壤) (高盐H,> 4.0,中盐M,2.0-4.0,低盐L,1.0-2.0)的土壤中种植菊芋,将没有种植菊芋的土壤 (不受干扰的土壤) 作为对照,研究菊芋对盐碱地改良的效果。试验结果:(1)土壤pH值和盐含量:对应盐度下,对照土>非根际土>根际土;(2)中性磷酸酶和蔗糖酶的活性随着土壤含盐量的增加而降低,而过氧化氢酶的活性则相反;(3)相比于另两种土壤,石英含量在对照土中最低,绿泥石和白云母含量在对照土中最高。研究表明,菊芋不仅能降低土壤盐度,同时种植菊芋还可通过改变土壤酶的活性来改良盐碱土。36608 毕业论文关键词:菊芋;盐碱土;矿物;土壤酶活性;改良
Effects of Jerusalem artichoke on soil physical and chemical properties in the coastal saline zone
Abstract: Soil salinity is one of the main environmental constraints restricting plant growth and agricultural productivity. This study used an in-situ remediation method by planting Jerusalem artichoke in the soils with different salinities (in g salt kg-1 soil) (high salinity H, >4.0, moderate salinity M, 2.0-4.0, low salinity L, 1.0-2.0) in comparison with the respective controls without Jerusalem artichoke planting (undisturbed soil) to study the improvement effect of Jerusalem artichoke on saline soil. In the same salinity, soil pH and salinity increased sequentially from the rhizosphere to the bulk soil and the unplanted controls. The activities of neutral phosphatase and invertase decreased in the order L > M > H, whereas the activity of catalase was reversed. Compared with rhizosphere soil and bulk soil, the lowest content of quartz and highest content of chlorite and albite were found in the control soils. The study showed that Jerusalem artichoke not only could be used to improve the saline-alkali soil, but enhancing the activity of phosphatase and invertase.
Key words: Jerusalem artichoke; alkali-saline soil; minerals; soil enzyme activity; improvement
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