矿质肥料对杉木苗生理和根际化学性质的影响

Effects of Mineral Fertilizers on physiological characteristic of Chinese Fir Seedling and on Chemical properties of Rhizosphere Soil

本文分析了施用矿质肥料后杉木苗的生理指标及根际土壤化学性质。试验结果表明：①明显增加了杉木苗的生物量，其中氮磷钾混施效果最好，单施氮肥茎叶生物量增加明显，但根／冠下降；磷钾混施根／冠增大，但对茎叶生长作用不明显。②氮磷钾混施和单施氮极大地提高了叶子叶绿素含量。③明显降低了苗木根际土壤的ｐＨ，还造成了水解氮、交换性钾和速效磷的根际亏缺，同时提高了根际微量元素铁、锰、锌、铜的有效性。

using mineral fertilizers,the biomass of chiners fir seedling was increased apparently,mired NPK treatment was the first.Single N treatment caused biomass increase of stalk and leaf,but decrease of root/crown value.Mixed Pk enhanced root/crown value,however,no significant influence on the growth of stalk and leaf.Both mixed NPK treatment and N treatment greatly increased chlorophyll.pH of rhizosphere soil was evidenth lower as a result of treatment of mineral fertilizing.Mineral fertilizers were responsible for rhizosphere deficiency in hydrolysable N,exchange K and active phosphorus,meanwhile rhizosphere soil micro-element were more available, such as Fe,Cu,Zn,Mn,etc.