摘要
本文应用蒋柏藩和顾益初(1989)提出的石灰性土壤无机磷的分级方法,对我国北方主要的石灰性土类进行了无机磷形态分级的研究,并对其有效性作出了初步评价。供试的甘肃、陕西和河南的16种土壤的无机磷形态的分布情况为:Ca_2-P平均占无机磷总量的1.34%,Ca-P占9.91%,Al-P占4.27%,Fe-P占4.40%,O-P占10.9%,Ca_(10)-P占69.1%。生物试验的结果表明:Ca_2-P型的磷酸盐是最有效的,也是作物磷素营养的主要来源;Ca_(?)-P、Al-P和Fe-P可以作为缓效磷源;Ca_(10)-P和O-P只是一种潜在磷源。本研究为石灰性土壤无机磷的研究和磷肥的合理施用提供了理论依据。
This paper deals with sixteen typical calcareous soils (pH 8.09—8.69 and CaCO_2 content 2.95—15.8%), i. e. sierozem, chestnut soil, dark loessial soil, yellow cultivated loessial soil, old manural loessial soil, black loessial soil, and yellow fluvoaquic soil sampled, respectively, from Gansu, Shanxi, and Henna provinces of China. The scheme developed by Jiang Baifan and Gu Yichu was employed for inorganic-P fractionation and the results show that the total amount of inorganic-P in the calcaerous soils tested is 550 ppm on average, in which Ca_(?)-P, Ca_(?)-P, Al-P, Fe-P, O-P, and Ca_(10)-P account for 1.34%, 9.91%, 4.27%, 4.40%, 10.9% and 69.1% respectively. The regression analyses between different forms of inorganic-P and P uptaken by plants indicate that the availability of Ca_(?)-P is surely recognized, and the P uptaken by plants is mainly Ca_(?)-P; Ca_(?)-P, Al-P, and Fe-P are also available forms of inorganic-P; while Ca_(10)-P is unavailable.
出处
《土壤学报》
CAS
CSCD
北大核心
1992年第1期80-86,共7页
Acta Pedologica Sinica
关键词
石灰性
土壤
无机磷
磷
有效性
Calcareous soil, Inorganic-P forms, P availability
