Biocharsoil additions increased the pore water pH from 7.1 to up
to 8.2 (p < 0.05) (Table 1). With the exception of husk-char, additions of straw-char and fine bran-char increased the initial DOC
C
pw (37.2 mg L1) by 61–112%. Fine biochars were generally more
effective at enhancing the pH and DOC Cpw (p < 0.001) (Table 1).
Initial C
pw of Cd (107 lg L1) and Zn (2.1 mg L1) decreased significantly (p < 0.001) by 43–89% and 55–95%, respectively, as a result of biochar additions; however, the Cpw of As (0.05 mg L1)
increased by up to a factor 14.2 (Fig. 1). Additions of husk- and
bran-char significantly decreased Pb Cpw (27 lg L1 initially) by
up to 26%, however straw-char resulted in a significant increase
of 23% (Fig. 1). Overall, straw-char addition caused the largest decrease of Cd and Zn C
pw (to factors 0.1 and 0.05 of the original,
respectively); bran-char addition resulted in the largest decrease
of Pb C
pw (to a factor 0.7), and the greatest increase of As Cpw.
Regarding the size fraction, for Cd and Zn Cpw fine bran-char
caused 32% and 24% more of a decrease than the coarse one,
though fine husk- and straw-char performed resulted in a slight,
though significant decrease compared to the coarse varieties
(p < 0.01). For As, fine bran-char caused a 290% increase in Cpw
compared to the coarse fraction, though fine husk-char and
straw-char performed similarly to coarse. There were no significant differences in Pb C
pw between coarse and fine particle sizes
for any biochar treatment
Biocharsoil additions increased the pore water pH from 7.1 to upto 8.2 (p < 0.05) (Table 1). With the exception of husk-char, additions of straw-char and fine bran-char increased the initial DOCCpw (37.2 mg L1) by 61–112%. Fine biochars were generally moreeffective at enhancing the pH and DOC Cpw (p < 0.001) (Table 1).Initial Cpw of Cd (107 lg L1) and Zn (2.1 mg L1) decreased significantly (p < 0.001) by 43–89% and 55–95%, respectively, as a result of biochar additions; however, the Cpw of As (0.05 mg L1)increased by up to a factor 14.2 (Fig. 1). Additions of husk- andbran-char significantly decreased Pb Cpw (27 lg L1 initially) byup to 26%, however straw-char resulted in a significant increaseof 23% (Fig. 1). Overall, straw-char addition caused the largest decrease of Cd and Zn Cpw (to factors 0.1 and 0.05 of the original,respectively); bran-char addition resulted in the largest decreaseof Pb Cpw (to a factor 0.7), and the greatest increase of As Cpw.Regarding the size fraction, for Cd and Zn Cpw fine bran-charcaused 32% and 24% more of a decrease than the coarse one,though fine husk- and straw-char performed resulted in a slight,though significant decrease compared to the coarse varieties(p < 0.01). For As, fine bran-char caused a 290% increase in Cpwcompared to the coarse fraction, though fine husk-char andstraw-char performed similarly to coarse. There were no significant differences in Pb Cpw between coarse and fine particle sizesfor any biochar treatment
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