PHYTOLITHS IN CHRONOSEQUENCE SOILS DERIVED FROM BASALT IN LEIQIONG AREA AND ITS IMPLICATION IN PEDOGENESIS
Content and morphotype of phyoliths was studied in a soil chronosequence consisting of five soil profiles developed from basalt ranging in age from 10 000 years to 6.12 million years in tropical Leiqiong area. It was found that 1 ) the content of phytoliths in the soils, ranging from 1.54 to 21.95 g kg-1, was high in the surface horizon and decreased with the depth in profile; its drop was sharp from entisols to ferrosols and less significant from ferrosols to ferralsols, and then leveled off after entering ferrosols; 2) originated mainly from poaceae and palmae, the phytoliths ranged from 5 to 130 μm in size and appeared in 12 shapes, e.g. spherical echinate, dumbbell, fan, rectangular, square, saddle, hat, rod, tapered, crenate, round and others. The phytolith samples were all ＞ 0.5 in warmth index, indicating the study area has basically been under a warm climate since 6.12 Ma.
国家科技期刊平台
NSTL
万方数据
维普
