造成中低产土壤的主要因素是土壤养分缺乏，其次是部分土壤存在障碍因素。
All above are composed of lower to medium fertile soils and lacking of nutrients is of main reason of low yields.
结果表明，研究地区林地土壤养分普遍缺乏，其中以土壤有效养分的缺乏尤为严重。
The results showed that the levels of nutrients in the soils were very low, especially for the available nutrients in the soils.
土壤养分（N）缺乏，酚积累，最终导致多酚氧化酶活性增强。
Nitrogen absence results in phenol accumulation which results in an increase in the activity of phenolase.
应用推荐