C/N ratio can be taken as a rooting index of elm tip.
碳/氮比率可作为白榆新梢生根的指标。
The objective of this paper is to introduce the influence of different carbon source, such as methanol, sucrose, glucose and newspaper etc and the effect of C/N ratio on denitrification, .
本文论述了甲醇、蔗糖、报纸等不同物质作为碳源及其碳氮比对反硝化过程的影响，并对各碳源适宜的碳氮比加以总结。
The second had low phosphorus and low C/N ratio including fishes such as lower and middle carnivores such as Pseudosciaena polyactis, Platycephalus indicus and Argyrosomus argentatus.
第二类种类最多，主要包括小黄鱼、鲬和白姑鱼等中、低级肉食性鱼类，其元素组成特征为低磷、低C／N比值，；
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