Relationships Between Humus and Cadmium Speciation of Reclaimed Soil Under Various Vegetation
[Objective] Clarifying the relationship between soil humus and Cd in different vegetation was supposed to provide a support for controlling cadmium activity in reclaimed soil.[Methods] The 7-year soil at coal gangue reclamation area in Datong District,Huainan City,was taken as research samples.The contents of humus and cadmium chemical speciation in this region were measured under three typical plant restoration patterns (A Syzygium aromaticum + Robinia pseudoacacia,B Photinia serrulata + Vicia hirsuta,C Ailanthus altissima+V.hirsuta).The chemical morphology of Cd and humus components were determined by tessier five-step extraction method and modified humus analytical method,respectively,and the relationship was illustrated by multivariate statistical analysis.[Results] (1) The humification degree of the C plant allocation pattern was higher than those of A and B in the reclamation area of the mining area;(2) The content of exchangeable Cd in the C plant allocation pattern of the reclaimed land was lower than those in the other two plant allocation patterns;(3) The positive correlation coefficient between available Cd and fulvic acid (FA) was significant in the reclamation area.[Conclusion] Not only can the appropriate plant restoration pattern C adjust the properties and forms of humus in reclaimed soils,but also can affect the potential bioavailability of cadmium.
国家科技期刊平台
NSTL
万方数据
维普
