科学家们考虑过是放射性土壤导致的，或者是某种植物释放的毒素杀死了圆形植被造成的。
Scientists have suggested radioactive soil, or that toxins released from plants kills the vegetation in circular patterns.
全球越来越多的土壤侵蚀不仅导致了更多的土壤流失而且播散了致病微生物和各种毒素。
Increased soil erosion worldwide not only results in more soil being blown but spreading of disease microbes and various toxins.
环保局说，这是在清洗，纯化和废物处置阶段，干洗，这些有害毒素可以进入我们的空气，水和土壤中。
The EPA says that it is during the cleaning, purification, and waste disposal phases of dry cleaning that these hazardous toxins can get into our air, water, and soil.
工厂有充分的天然毒素，因此，目标是要找到微生物在土壤中能分解某些这些化学品。
Plants are full of natural toxins, so the goal was to find microorganisms in soil capable of breaking down certain of those chemicals.
已经上市销售的所有转基因食品的大约40%都包括来自土壤细菌的DNA，它产生一种杀虫剂(Bt毒素)，造成作物产生这种化学物。
Approximately 40% of all GM foods on sale contain DNA from a soil bacterium, which produces an insecticide (Bt toxin), causing the plant to produce this chemical.
科学家发现，带有抗虫基因的作物能在土壤里留下毒素，这种毒素既能杀死害虫也能杀死益虫。
Scientists have found that a crop with a gene that kills pests can leave a poison in the soil that kills helpful as well as harmful insects.
本论文报道了连作、轮作大豆根际土壤微生物区系变化、土壤真菌优势类群、连作大豆根际土壤真菌优势类群紫青霉菌毒素的理化特性及其作用的研究结果。
In this paper, the changes of soil microbial community by soybean continuous cropping , dominant fungi, phytotoxins produced by P. purpurogenum and it's toxicity to soybean was reported.
本论文报道了连作、轮作大豆根际土壤微生物区系变化、土壤真菌优势类群、连作大豆根际土壤真菌优势类群紫青霉菌毒素的理化特性及其作用的研究结果。
In this paper, the changes of soil microbial community by soybean continuous cropping , dominant fungi, phytotoxins produced by P. purpurogenum and it's toxicity to soybean was reported.
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