The relationship between phosphorus fractions, phosphatase activity and fertility in three rain forest soils
The relationship between phosphorus fractions, phosphatase activity and fertility in three rain forest soils
复制标题
三种雨林土壤中磷组分、磷酸酶活性和肥力之间的关系
作者：
M. L. Saker;R. Congdon;C. Maycock
本研究调查了昆士兰州东北部三个雨林中磷的有效性和土壤结合磷的形式。所调查的土壤类型在土壤总磷方面存在显着差异，从玄武岩到冲积土再到花岗岩，土壤的肥力逐渐降低。在所有地点，只有一小部分总磷可供植物吸收，其中大部分以有机物和无机物的形式结合。对 Alphitonia petriei 进行了盆栽实验，该实验在从三个地点收集的土壤中生长。四个月后，干重出现显着差异，从有效磷浓度较低的地点收集的花岗岩土壤中，植物生长缓慢。这些植物还具有显着更高的根冠比和更低的细胞内磷浓度。在有效磷含量低的土壤中生长的植物的根磷酸酶活性更高。
This study investigates the availability of phosphorus and the forms of bound soil phosphorus present in three rain forest stands in north eastern Queensland. The soil types investigated differed significantly with respect to total soil phosphorus, with fertility decreasing in soils from basaltic to alluvial to granitic origin. At all sites only a small proportion of total phosphorus was available for plant uptake, with most being bound in organic matter and inorganic forms. A pot experiment was set up with Alphitonia petriei which was grown in soil collected from each of the three sites. After four months there was a significant difference in the dry weights, with plants showing stunted growth in the granitic soil collected from the site with the lower available phosphorus concentrations. These plants also had significantly higher root to shoot ratios and lower intracellular concentrations of phosphorus. Root phosphatase activity was greater for plants grown in soil low in available phosphorus.