沤田型水稻土真菌生态的研究

沤田型水稻土多分布于湖滨、海滨及江河两岸的圩田中央,丘陵地区下部或某些局部低洼地区,分布范围很广,面积也大,江苏、福建、广东、广西等省均有.这类土壤地下水位高,积水难排、通气性差、还原势高、不利于土壤中为数最多的需氧性微生物的发育,因此微生物数量少、活性低、土壤中的有机物质难以彻底分解,是我国低产水稻土的主要类型之一.

ECOLOGICAL DISTRIBUTION OF FUNGI IN SUBMERGED PADDY SOIL

This article deals with the characteristics of the mycoflora in plough layers of the permanently submerged paddy soils (P.P.S.) developed on lacustrine deposit in central and southern Jiangsu province,alluvial deposit along the lower Yangtze river,and loesaal deposit near Nanjing,or of other submerged soils under anaerobic condition in various districts.The characteristics of mycoflora of the soils mentioned above in tomparison with that under temporarily submerged paddy soils (T.P.S.) are also described.The results obtained are as follows:1) The fungus population in P.P.S.is less than that in T.P.S.,and the mycoflora in P.P.S.is characterized by the occurence of Emericellolosis and Phoma+No.1221.Little variation on fungi quantities and mycofloral components was found in P.P.S.