三江平原白浆土发生学特性

本文对三江平原三个典型白浆土剖面的理化性质、土壤微形态和矿物学性质的研究，探讨了白浆土的发生学特性。土体中Ｚｒ／Ｓｒ和Ｔｉ／Ｚｒ比率的变异系数表明，所研究的土壤剖面其成土母质岩性是连续的。典型白浆土具有一个松软的表土层、一个漂白层和一个相当厚的粘化淀积层。研究还表明，粘粒的悬浮迁移是白浆土的主要成土过程。表层和白浆层在成土过程中有Ｆｅ－Ｍｎ结核形成，且是原地形成的，其Ｆｅ、Ｍｎ明显源于原生矿物的风

PEDOGENETIC CHARACTERISTICS OF ALBIC SOILS IN THE THREE RIVER PLAIN, HEILONGJIANG PROVINCE

With the study of physical,chemical,morphological and mineralogical properties of three pedons of typical albic soils from the Three River plain of Heilongjiang Province,we discussed the pedogenetic characteristics.The profiles were found to be lithologically countinuous by the comparsion of Zr/Sr and Ti/Zr ratio within the pedons.The albic soils study was characterized by a mollic epipedon,an ablic E horizon and a thick argillic horizon.Through this study,it was indicated that lessivage was a dominant pedogenetic process.Pedogenic Fe Mn nodules were found abundant in Ah and E horizons and were apparently forrned by weathering of Fe-Mn primary minerals,and the nodules may have developed in situ.The maximum amounts of pyrophosphate extractable Fe and AI appeared it Bt2 horizons were smaller than the values required for podzols.Vermiculite,which had not previously been recognized,dominated the clay fraction of albic soils.The clay mineral assemblage was qualitatively similar but quantitively differentiated throughout the profile.Finally,we suggested that the albic soils could be classified as mollie planosols in the FAO-UNESCO system and Typical Argialbolls in Soil Taxonomy.