Effects of Heat Modified Kaoline on Soil Cadmium Form and Cadmium Uptake by Pepper

doi:10.11924/j.issn.1000-6850.casb2021-0288

Abstract

Abstract:

To investigate the effect of heat modified kaoline on Cd migration in soil-pepper system, heat modified kaoline at 2 temperatures (300 and 500℃) was studied, the effects of kaoline and heat modified kaoline on the morphological distribution of Cd in Cd contaminated soil and the accumulation of heavy metals in pepper were investigated by pot culture. The results showed that in Cd contaminated soil, the application of kaoline and heat modified kaoline improved soil pH, but the difference between the treatments was not significant; compared with that of CK, the reducible Cd content in 300℃ and 500℃ treatment was reduced by 1.82%-33.94% and 11.76%-26.67%, respectively, the residue Cd content was increased by 46.63%~64.58% and 45.96%-1.14%, respectively; dry weight of the roots, stems, leaves and fruits of pepper in each treatment were higher than those of CK, capsicum fruit dry weight was increased by 31.00%-49.28%, the enrichment of Cd in pepper plants was roots > leaves > stems > fruits. In conclusion, the application of kaoline and heat modified kaoline could improve soil pH, decrease the content of soil weak acid extraction state and reducible Cd, ease Cd pressure on chili pepper, and the remediation effect is TK>FK>K.

Key words: thermal modification, Cd form, kaoline, accumulation, pepper

CLC Number:

Yang Jiaojiao, Chai Guanqun, Liu Guihua, Wang Ying, Qin Song, Fan Chengwu. Effects of Heat Modified Kaoline on Soil Cadmium Form and Cadmium Uptake by Pepper[J]. Chinese Agricultural Science Bulletin, 2021, 37(20): 71-76.

Figures/Tables 6

References 38

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处理	高岭土及热改性高岭土	用量(w/w)/%
CK	—	0
K1	高岭土	0.2
K2	高岭土	0.5
K3	高岭土	1.0
TK1	300℃热改性高岭土	0.2
TK2	300℃热改性高岭土	0.5
TK3	300℃热改性高岭土	1.0
FK1	500℃热改性高岭土	0.2
FK2	500℃热改性高岭土	0.5
FK3	500℃热改性高岭土	1.0

处理	高岭土及热改性高岭土	用量(w/w)/%
CK	—	0
K1	高岭土	0.2
K2	高岭土	0.5
K3	高岭土	1.0
TK1	300℃热改性高岭土	0.2
TK2	300℃热改性高岭土	0.5
TK3	300℃热改性高岭土	1.0
FK1	500℃热改性高岭土	0.2
FK2	500℃热改性高岭土	0.5
FK3	500℃热改性高岭土	1.0

处理	根	茎	叶	果实
CK	4.20±0.80a	1.68±0.37a	2.19±0.26abc	0.51±0.07a
K1	4.06±0.53ab	1.12±0.21b	2.39±0.49abc	0.48±0.05ab
K2	4.04±0.39ab	0.70±0.15c	2.04±0.24abc	0.46±0.11ab
K3	3.48±0.22ab	0.93±0.04bc	1.85±0.27c	0.45±0.10ab
TK1	3.60±0.21ab	1.02±0.11bc	2.11±0.26abc	0.44±0.06ab
TK2	3.47±0.18ab	0.77±0.15bc	2.47±0.28a	0.43±0.01ab
TK3	3.97±0.02ab	0.71±0.18c	2.07±0.31abc	0.39±0.03b
FK1	3.85±0.33ab	0.88±0.09bc	1.89±0.36c	0.45±0.01ab
FK2	3.77±0.32ab	0.82±0.05bc	2.24±0.19abc	0.48±0.02ab
FK3	3.29±0.51b	1.56±0.26a	1.96±0.29bc	0.42±0.05ab

处理	根	茎	叶	果实
CK	4.20±0.80a	1.68±0.37a	2.19±0.26abc	0.51±0.07a
K1	4.06±0.53ab	1.12±0.21b	2.39±0.49abc	0.48±0.05ab
K2	4.04±0.39ab	0.70±0.15c	2.04±0.24abc	0.46±0.11ab
K3	3.48±0.22ab	0.93±0.04bc	1.85±0.27c	0.45±0.10ab
TK1	3.60±0.21ab	1.02±0.11bc	2.11±0.26abc	0.44±0.06ab
TK2	3.47±0.18ab	0.77±0.15bc	2.47±0.28a	0.43±0.01ab
TK3	3.97±0.02ab	0.71±0.18c	2.07±0.31abc	0.39±0.03b
FK1	3.85±0.33ab	0.88±0.09bc	1.89±0.36c	0.45±0.01ab
FK2	3.77±0.32ab	0.82±0.05bc	2.24±0.19abc	0.48±0.02ab
FK3	3.29±0.51b	1.56±0.26a	1.96±0.29bc	0.42±0.05ab

处理	富集系数
处理	叶/土壤	根/土壤	茎/土壤	果实/土壤l
CK	0.17	2.04	0.75	0.25
K1	0.10	1.74	0.52	0.22
K2	0.07	1.66	0.36	0.21
K3	0.02	1.39	0.46	0.21
TK1	0.05	1.86	0.47	0.19
TK2	0.08	1.61	0.38	0.23
TK3	0.09	1.53	0.35	0.19
FK1	0.05	1.83	0.43	0.22
FK2	0.03	1.79	0.40	0.24
FK3	0.12	1.32	0.68	0.18