It shows that the greater fine root diameter is, the lower the nutrient concentration is.
光皮桦不同径级细根，N、P、K、Ca、Mg含量都是O～1 mm＞1～2mm，表明细根径级越大，养分浓度越低。
参考来源 - 光皮桦—扁穗牛鞭草复合模式细根分布与养分动态研究·2,447,543篇论文数据，部分数据来源于NoteExpress
覆盖提高了杨树叶片养分浓度。
Mulching heightened the nutrient concentrations of poplar leaves.
本文用实测资料分析了温度对麦田土壤溶液养分浓度的影响。
Study was conducted to undersdand the effects of temperature on the nutrient concentrations in soil solution.
对鄂南5县（市）毛竹林33样点的叶片养分浓度进行了分析。
The nutrition status of bamboo leaves from 33 samples taken from 5 counties in the south of Hubei Province was analyzed.
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