| 施用生物炭对红壤性水稻土重金属钝化与土壤肥力的影响 |
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| 引用本文： | 郭碧林,陈效民,景峰,杨之江,刘巍.施用生物炭对红壤性水稻土重金属钝化与土壤肥力的影响[J].水土保持学报,2019,33(3):298-304. |
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| 作者姓名： | 郭碧林 陈效民 景峰 杨之江 刘巍 |
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| 作者单位： | 南京农业大学资源与环境科学学院, 南京 210095 |
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| 基金项目： | 国家重点研发计划项目（2016YFD0800306） |
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| 摘 要： | 通过田间小区试验,分析了不同用量的生物炭处理下(0,10,20,30,40 t/hm^2)0-17,17-29 cm土层土壤的理化性质、重金属钝化及酶活性的影响。采用IFI(土壤肥力综合质量指数)评价了土壤肥力状况。结果表明:施用生物炭可以改善红壤的理化性状,降低土壤容重,提高土壤的孔隙度、饱和含水量、pH、CEC、有机质、有效磷、铵态氮和全氮及DOC含量;同时提高土壤脲酶、过氧化氢酶和蔗糖酶活性。土壤有效态Cd和Pb含量均随生物炭施用量的增加而减少;而有效态As含量则随生物炭施用量的增加呈先增后减的趋势,三者均在生物炭施用量为40 t/hm^2时为最小值。利用IFI对土壤肥力综合质量进行评价可知,在不同生物炭用量条件下土壤肥力综合质量指数依次为A30>A40>A20>A10>CK,相应的土壤肥力综合质量指数分别为0.64,0.62,0.57,0.47,0.44。评价结果表明在生物炭施用量为30 t/hm^2时,红壤的肥力改良效果最佳。因此,采用适量的生物炭可修复重金属对红壤性水稻土的污染,并改善土壤肥力状况。
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| 关 键 词： | 红壤性水稻土 生物炭 可溶态重金属 酶活性 土壤肥力综合质量指数 |
| 收稿时间： | 2018/10/25 0:00:00 |
Effects of Biochar Application on Heavy Metal Passivation and Soil Fertility in the Red Paddy Soil |
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| GUO Bilin,CHEN Xiaomin,JING Feng,YANG Zhijiang,LIU Wei.Effects of Biochar Application on Heavy Metal Passivation and Soil Fertility in the Red Paddy Soil[J].Journal of Soil and Water Conservation,2019,33(3):298-304. |
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| Authors: | GUO Bilin CHEN Xiaomin JING Feng YANG Zhijiang LIU Wei |
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| Institution: | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095 |
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| Abstract: | 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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| Keywords: | red paddy soil biochar soluble heavy metals enzyme activity the soil integrated fertility index (IFI) |
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