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共生固氮是土壤氮素的主要来源之一。它在保持土壤氛素肥力和保证农业的持续发展中起着重要的作用。长期来人们曾在测定共生固氮量方面作过很多工作并发展出了多种测定方法，这些方法各有其优缺点。鉴于15N稀释法中土壤中植物吸收的氛的15N丰度不稳定将会给测定结果带来较大的?
Symbiotic nitrogen fixation is one of the main sources of soil nitrogen. It plays an important role in maintaining the fertility of soil atmosphere and ensuring the sustainable development of agriculture. For a long time people have done a lot of work in the determination of symbiotic nitrogen fixation and developed a variety of measurement methods, each of these methods have their advantages and disadvantages. Given that the 15N abundance of the plant-absorbed atmosphere in the soil in the 15N dilution method is not stable, it will give a large measure of results.