Analysis of improvement characteristics of tropical saline soil and vegetation using salt tolerant weeds

本研究旨在获得利用耐盐杂草改良热带盐碱地和植被特性的基本信息。在泰国田间条件下和室内条件下得到的结果如下：1.在泰国盐碱地种植的杂草，如马唐、绿竹叶和马唐，其土壤水分和Na的积累量远低于无杂草田。2.土壤表层的改善作用大于深层。3.土壤水分含量高与土壤Na积累量少有很好的相关性。4.在杂草种类中，5.植物的高抗氧化活性和氨同化活性是其耐盐机制中的重要因素，但不同植物的耐盐机制不同。6.除上述因素外，精氨酸、谷氨酰胺和多胺也部分参与了盐胁迫的耐盐机制。结论如下：1.耐盐杂草适合改良盐碱地。2.盐生杂草对盐碱地的改良效果取决于不同物种诱导的生物量。3.植物的耐盐机制不同，但氨代谢和与氧化过程有关的酶是主要因素。

The study was conducted to obtain the basic information about improvement characteristics of tropical saline soil and vegetation using salt tolerant weeds. The results obtained under field conditions in Thailand and in laboratory conditions in the study are summarized as follows.1.Soil moisture content and Na accumulation were much less in the weed, such as Digitaria agegypticum, Chloris barbarta, and Panicum repens, growing fields than the weed-free field in salt-affected soil in Thailand.2.The improving effects was greater in the top soil layer than the deeper soil layer.3.There was a good correlation between less Na accumulation and higher soil moisture content.4.Among weed species, the improving effect was different depending on each biomass.5.The high antioxidative activity and the ammonium assimilation activity were important factors in the tolerant mechanisms to salt stress but these were different among plant species.6.In addition to these factors, arginine, glutamine and polyamies were partially contributed to salt stress tolerant mechanism.It is concluded as follows.1.Salt-tolerant weed species are suitable for improving saline soil2.Improving effect of living weed on saline soil depends on the biomass induced by each species specificity.3.Salt tolerant mechanism is different among plant species, but the metabolism regarding ammonium and the enzymes related to oxidation process are main factors.