| 添加生物炭对酸性红壤中玉米生长和氮素利用率的影响 |
| |
| 作者姓名： | ZHU Qiao-Hong PENG Xin-Hu HUANG Tai-Qing XIE Zu-Bin N. M. HOLDEN |
| |
| 基金项目： | Supported by the National Key Technology R＆D Program of China （No. 2011BAD31B04） and the National Natural Science Foundation of China （Nos. 41371235 and 41171191）. |
| |
| 摘 要： | Biochar added to soil can improve crop growth through both direct and indirect effects, particularly in acidic, highly weathered soils in subtropical and tropical regions. However, the mechanisms of biochar improving crop growth are not well understood. The objectives of this study were i） to determine the crop responses to biochar addition and ii） to understand the effect of biochar addition on N use efficiency. Seven acidic red soils varying in texture, p H, and soil nutrient were taken from southern China and subjected to four treatments： zero biochar and fertilizer as a control（CK）, 10 g kg-1biochar（BC）, NPK fertilizers（NPK）, and 10 g kg-1biochar plus NPK fertilizers（BC＋NPK）.15N-labeled fertilizer was used as a tracer to assess N use efficiency. After a 46-d pot experiment,biochar addition increased soil p H and available P, and decreased soil exchangable Al3＋, but did not impact soil availabe N and cation exchange capacity（P 〉 0.05）. The N use efficiency and N retained in the soil were not significantly affected by biochar application except for the soil with the lowest available P（3.81 mg kg-1） and highest exchanageable Al3＋（4.54 cmol kg-1）. Greater maize biomass was observed in all soils amended with biochar compared to soils without biochar（BC vs. CK, BC＋NPK vs. NPK）. This agronomic effect was negatively related to the concentration of soil exchangeable Al3＋（P 〈 0.1）. The results of this study implied that the liming effect of biochar improved plant growth through alleviating Al toxicity and P deficiency, especially in poor acidic red soils.
|
| 关 键 词： | 氮肥利用率 酸性红壤 玉米生长 生物炭 土壤养分变化 氮素利用效率 阳离子交换容量 作物生长 |
| 收稿时间： | 4 April 2014 |
Effect of biochar addition on maize growth and nitrogen use efficiency in acidic red soils |
| |
| ZHU Qiao-Hong,PENG Xin-Hu,HUANG Tai-Qing,XIE Zu-Bin,N. M. HOLDEN.Effect of biochar addition on maize growth and nitrogen use efficiency in acidic red soils[J].Pedosphere,2014,24(6):699-708. |
| |
| Authors: | ZHU Qiao-Hong PENG Xin-Hu HUANG Tai-Qing XIE Zu-Bin and N M HOLDEN |
| |
| Institution: | 1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)
2University of Chinese Academy of Sciences, Beijing 100049(China)
3UCD School of Biosystems Engineering, Agriculture and Food Science Centre, University College Dublin, Belfield, Dublin 4 (Ireland) |
| |
| Abstract: | Biochar added to soil can improve crop growth through both direct and indirect effects, particularly in acidic, highly weathered soils in subtropical and tropical regions. However, the mechanisms of biochar improving crop growth are not well understood. The objectives of this study were i) to determine the crop responses to biochar addition and ii) to understand the effect of biochar addition on N use efficiency. Seven acidic red soils varying in texture, pH, and soil nutrient were taken from southern China and subjected to four treatments: zero biochar and fertilizer as a control (CK), 10 g kg-1 biochar (BC), NPK fertilizers (NPK), and 10 g kg-1 biochar plus NPK fertilizers (BC+NPK). 15N-labeled fertilizer was used as a tracer to assess N use efficiency. After a 46-d pot experiment, biochar addition increased soil pH and available P, and decreased soil exchangable Al3+, but did not impact soil availabe N and cation exchange capacity (P > 0.05). The N use efficiency and N retained in the soil were not significantly affected by biochar application except for the soil with the lowest available P (3.81 mg kg-1) and highest exchanageable Al3+ (4.54 cmol kg-1). Greater maize biomass was observed in all soils amended with biochar compared to soils without biochar (BC vs. CK, BC+NPK vs. NPK). This agronomic effect was negatively related to the concentration of soil exchangeable Al3+ (P < 0.1). The results of this study implied that the liming effect of biochar improved plant growth through alleviating Al toxicity and P deficiency, especially in poor acidic red soils. |
| |
| Keywords: | agronomic effect Al toxicity liming effect 15N labeling P deficiency |
| 本文献已被 CNKI 维普 ScienceDirect 等数据库收录！ |
| 点击此处可从《土壤圈》浏览原始摘要信息 |
| 点击此处可从《土壤圈》下载免费的PDF全文 |
|
