GUO Bilin, CHEN Xiaomin, JING Feng, et al. Effects of Biochar Application on Heavy Metal Passivation and Soil Fertility in the Red Paddy Soil[J]. 2019, 33(3): 298-304.
DOI:
GUO Bilin, CHEN Xiaomin, JING Feng, et al. Effects of Biochar Application on Heavy Metal Passivation and Soil Fertility in the Red Paddy Soil[J]. 2019, 33(3): 298-304. DOI: 10.13870/j.cnki.stbcxb.2019.03.044.
Effects of Biochar Application on Heavy Metal Passivation and Soil Fertility in the Red Paddy Soil
Field plot experiments were conducted to study the effects of biochar on soil physi-chemical properties
heavy metal passivation and enzyme activities in the red paddy soil polluted by heavy metals. Biochar was added in different amounts of 0
10
20
30 and 40 t/hm2
respectively. The soil samples were collected from 0-17 and 17-29 cm soil layers. The soil integrated fertility index (IFI) was used to assess the soil fertility. The results showed that biochar could increase soil fertility by reducing soil bulk density and improving soil porosity
saturated water content
pH
cation exchange capacity (CEC) and the content of soil organic matter (SOM)
the available phosphorus
ammonium nitrogen
total nitrogen and dissolved organic carbon (DOC). Meanwhile
biochar could improve activity of soil urease
catalase and urease. The content of available Cd and Pb in soil decreased with the increasing of biochar application amount
whereas the available As content increased first and then decreased with the increasing of biochar amount. The content of available Cd
As and Pb were all minimum when the biochar application was 40 t/hm2. According to the evaluation of soil quality by IFI
the order of soil fertility composite quality was followed A30 > A40 > A20 > A10 > CK
the corresponding soil fertility composite quality indexes were 0.64
0.62
0.57
0.47
0.44
respectively. The evaluation results suggested that the optimal amount of biochar was 30 t/hm2 for improving the red paddy soil fertility. In conclusion
appropriate amount of biochar application could remedied the red peddy soil polluted by heavy metal and enhance soil fertility.
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