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

为了解耐盐杂草对热带盐渍土和植被的改良特性提供基础资料。本研究在泰国野外条件和实验室条件下获得的结果如下：1.马唐、虎尾和稷等杂草的土壤含水量和Na积累量都很低，种植的田地比没有杂草的盐碱地要多，3.土壤Na积累量与土壤含水量之间存在较好的相关性5.高抗氧化活性和铵同化活性是植物耐盐机制的重要因素，但这些因素在植物种间存在差异。6.除这些因素外，精氨酸，谷氨酰胺和多酰胺在盐胁迫下的耐盐机制中起着重要作用，主要结论如下：1.盐胁迫下，耐盐杂草种类适合改良盐渍土2.活体杂草改良盐渍土的效果取决于各物种特异性诱导的生物量3.植物种类间耐盐机制不同，但与铵的代谢和与氧化过程相关的酶是主要因素。

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.