<正>以皖南杉林土壤为研究材料,做了无机磷和有机磷的分级测定以及速效磷分析方法的筛选,并把所得数据与立地指数及叶磷浓度联系起来。结果表明,土壤中的磷酸铝盐量(表层含量及全土贮量)与立地指数或叶磷农度都显著相关,是土壤养分中的限制因子;土壤的有机磷贮量与立地指数的相关性也明显,在这方面尤其是活性有机磷贮量的作用最重要。从4种速效磷测定方法中筛选出的BrayⅡ法,其全群数据的极差最大,并能反映Al-P与杉木生长量的关系,是适用于杉林土壤的较好方法。活性有机磷量也可作为衡量杉林土壤营养状况的一个指标,但回归分析表明其重要性亚于BrayⅡ法测定的速效磷。本文拟订的供磷能力分等标准比农田习用的要低得多。

In this paper soils under Chinese fir plantation in the southern Anhui province were studied, bv means of fractionation of organic and inorganic phosphorus compounds in soils, selection of analytical technique for determining soil available phosphorus, and correlation of the above-mentioned items to site index or phosphorus content in current needle of Chinese fir. It turned out that the quantities of Al-P correlated significantly with both site index and P o in the current needle of Chinese fir as the limiting factors among various soil nutrients. The storage of organic-P in soil also correlated significantly with site index, of which the storage of active organic-P was the most important one. Bray il method Was - fied from 4 techniques for determining available-P as the better one for soil under Chinese fir pic ruction. Quantity of active organic-P could also be used as an index to assess soil nutritive conditions. The soil criteria of P supplying ability worked out here were much lower than that commonly used for farmland.