RARE EARTH ELEMENTS DISTRIBUTION CHARACTERISTICS OF LARIX GMELINII FOREST SOILS IN NORTHERN DAXING'ANLING MOUNTAINS.

WANG, B.; WANG, Z. H.; ZHANG, Q. L.; SA, R.

Rare earth elements (REEs) have unique geochemical habits and have been widely recognized and applied in many aspects of the environment as a geochemical indicator. They are widely used in the homology determination study of different geological bodies. However, there is limited information on the distribution patterns and influencing factors of REEs in cold temperate forest soils. The Larix gmelinii is a dominant tree species in the cold temperate zone. This study aims to study the characteristics of REEs of three Larix gmelinii forest soils in northern Daxing'anling Mountains. A total of 112 representative soil samples were collected and the concentrations of 14 REEs were determined using X-ray fluorescence. The results show that: (1) The order of REEs content in Larix gmelinii soil is: Ce > La > Y > Gd > Dy > Yb > Sm > Er > Pr > Eu > Ho > Tb > Tm > Lu, which follows the Oddo-Harkins rule. The mean content of REEs in the Larix gmelinii soil is lower than the national and global average; the soil environment is basically safe under human disturbance. (2) The total REEs show an increasing trend with the depth of the soil profile, and tends to be gradual after 20 cm. The content of REEs in the three types of forest soils is in the order of Grass-Larix gmelinii forest (GL) > Ledum-Larix gmelinii (LL) > Rhododendron-Larix gmelinii (RL). (3) The relationship between REEs indicators and pH is significant, with SREE, LREE, HREE, LREE/HREE and pH showing a significant positive correlation, dEu, dCe and pH showing a significant negative. Understanding the distribution, migration, and transformation patterns of REEs in forest soil can help reveal the cycling mechanism of elements in forest ecosystems, provide guidance for improving forest soil fertility and promoting plant growth, and provide a basis for monitoring and evaluating the impact of human activities on forest soil environment.

FOREST soils; ENVIRONMENTAL soil science; X-ray fluorescence; SOIL depth; SOIL sampling; RARE earth metals; RARE earth oxides

Applied Ecology & Environmental Research, 2024, Vol 22, Issue 6, p5183

1589-1623

Academic Journal

10.15666/aeer/2206_51835196