我国林地土壤有效态镉的影响因素及拟合模型

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Abstract The 13 representative forest soils were selected in different climatic zones with various forest stands across the mainland of China. The soils were spiked with cadmium and then the distribution characteristics of soil solid-solution partition coefficient (K_d) and soil available cadmium (Cd) concentrations were analyze. The influences of soil/solution properties on K_d and soil available cadmium, and the corresponding empirical prediction models were further explored. K_d values varied from 0.91 to 623.66 L/kg with the average value of 53.11L/kgand variation of 684.37 folds between the maximum and minimum values in different spiked Cd treatments. The Cd concentration in soil pore water (PW-Cd) ranged from 0.309 (S13) to 104.450mg/L (S4) with the variation of 338 folds. The differences of DTPA extractable Cd (DTPA-Cd) contents were 9 and 1.4 folds, for the treatment of no Cd spiked soils and largest spiked dosage 128mg/kg, respectively. The results also showed that the pH positively correlated with K_d (R²=0.49, P<0.001) and inversely correlated with PW-Cd contents (R²=0.41, P<0.05). Single soil solution Mg²⁺ concentrations could explain 46% variance of the DTPA-Cd concentrations. No single controlling significant soil properties were found to affect the soil soil-liquid partition coefficient (K_d) according to the multiple regression equations. The simulation models were slightly improved by incorporation of other soil/solution properties. In conclusion, the soil solution pH and Mg²⁺ was two controlling factors.

Key words： forest soils cadmium solid-liquid distribution available prediction models

Received: 27 October 2020

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X53

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	Articles by authors
	ZHANG Xiao-qing
	WU Hao-xuan
	CHEN Shi-bao
	MENG Yu
	LUO Yan-jin
	REN Da-jun
	ZHANG Shu-qin

Cite this article:

ZHANG Xiao-qing,WU Hao-xuan,CHEN Shi-bao等. The influencing factors andsimulationmodels of available cadmium in forest soils in China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2761-2772.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I6/2761

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