narrower C/N是较低的碳氮比
wider C/N是较高的碳氮比.
举个例子：
Results obtainde in this study indicated that wider C/N ratio of wheat straw enhanced the immobilization of inorganic N.
研究结果表明,麦秆中的高C/N比增加了无机N的固定.
这里的CN既有有机态的,也有无机态的.