PDF《不同生物质炭对酸化茶园土壤 N2O 和CO2 排放的影响》

摘要: 为了研究不同生物质炭对酸化茶园土壤温室气体排放的影响, 采用原料为小麦秸秆、 柳树枝、 椰壳

3 种生物质炭, 通过室内 培养试验来探究不同生物质炭对茶园土壤性质及 N2O、 CO2 排放特征的影响.

试验中生物质炭添加量为

20 g ・ kg-1 , 同时设置了施氮 肥处理, 采用尿素作为外加氮源, 施氮量为

100 mg ・ kg-1 .结果表明, 施加生物质炭提高了酸化茶园土壤 pH 值, 柳树枝生物质炭处理 土壤 pH 值最高为 6.71, 显著高于其他处理.不同生物质炭对土壤 DOC 含量的影响效果存在差异, 柳树枝生物质炭使土壤 DOC 平 均含量增加了 95.6%, 椰壳生物质炭使土壤 DOC 含量降低 36.1%, 小麦秸秆生物质炭则影响不显著. 生物质炭通过抑制土壤硝化和 反硝化作用降低土壤 N2O 的排放, 椰壳生物质炭降低 N2O 排放比例达 91.7%, 减排效果最显著. 在施氮条件下柳树枝生物质炭对土 壤N2O 的减排效果显著低于小麦秸秆和椰壳生物质炭. 土壤 CO2 的排放通量与 pH 值、 DOC 含量均呈极显著正相关, 生物质炭促进 了土壤 CO2 的排放, 柳树枝生物质炭处理 CO2 的排放显著高于其他处理.此外, 外加氮源降低了土壤 pH 值, 增加了土壤 N2O 的排 放, 但是对土壤 DOC 含量变化无显著影响. 关键词: 生物质炭;

N2O 排放;

CO2 排放;

pH;

可溶性有机碳 中图分类号: X511 文献标志码: A 文章编号: 1672-2043 (2017) 12-2544-09 doi:10.11654/jaes.2017-0845 Effects of different biochars on N2O and CO2 emission from acidified tea field soil SUN Yun1 , HE Zhi-long1 , LIN Shan1* , ZHANG Shui-qing1,2* , LIU Wei-yang3 (1.College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070, China;

2.Institute of Plant Nutrition and Environmental Resources Science, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China;

3.College of Plant Science and Technology, Tarim University, Alar 843300, China) Abstract: An incubation experiment was conducted to determine the effects of the addition of three kinds of biochars (wheat straw, willow branches, and coconut shell)on acidified tea field soil properties and greenhouse gas emissions. In this experiment, the amount of biochar was

20 g ・ kg-1 , whereas urea was used as an additional nitrogen source for nitrogen fertilizer treatment at the rate of

100 mg・ kg-1 . The results showed that biochar addition was beneficial to improve the pH value of acidified tea field soil, and the soil pH of the willow biochar addition treatment was 6.71, which was significantly higher than that of the other treatments. Significant differences were noted between the biochar treatments for soil dissolved organic carbon (DOC)content. Compared with that of the control treatment, the soil DOC content increased by 95.6% in the willow biochar treatment and decreased by 36.1% in the coconut shell biochar treatment, whereas no significant difference 收稿日期: 圆园17原06原13 录用日期: 圆园17原09原01 作者简介: 孙(员怨怨猿―), 男, 河南南阳人, 硕士研究生, 主要从事农田温室气体研究.耘原皂葬蚤造: 圆怨园愿园源员愿缘岳择择援糟燥皂 * 通信作者: 林杉耘原皂葬蚤造: 造蚤灶泽澡葬灶岳皂葬蚤造援澡扎葬怎援藻凿怎援糟灶;

张水清 耘原皂葬蚤造: 扎泽择缘员园岳员远猿援糟燥皂 基金项目: 国家自然科学基金项目 (源员圆园员圆缘缘, 源员缘远员园远愿) ;