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| 成都平原水稻-油菜轮作系统氧化亚氮排放 | |
| 引用本文： | 于亚军,朱波,王小国,项虹艳,郑循华.成都平原水稻-油菜轮作系统氧化亚氮排放[J].应用生态学报,2008,19(6):1277-1282. |
| 作者姓名： | 于亚军 朱波 王小国 项虹艳 郑循华 |
| 作者单位： | 1. 中国科学院成都山地灾害与环境研究所,成都,610041;中国科学院研究生院,北京,100049 2. 中国科学院成都山地灾害与环境研究所,成都,610041 3. 中国科学院大气物理研究所,北京,100029 |
| 基金项目： | 国家重点基础研究发展计划(973计划) , 国家自然科学基金 |
| 摘 要： | 2005年6月—2006年6月利用静态箱/气相色谱法对成都平原水稻 油菜轮作系统氧化亚氮（N2O）排放进行定位观测, 研究了该系统N2O排放特征及土壤水热状况、氮肥施用、作物参与对N2O排放的影响. 结果表明: 成都平原水稻-油菜轮作系统N2O排放总量为（8.3±2.8）kg·hm-2·a-1, 水稻季、油菜季和休闲期对整个轮作周期N2O排放总量的贡献分别为30%、65%和5%. 水稻季N2O平均排放速率表现为排灌交替期最大, 持续淹水期和排水晒田期相当;氮肥施用是N2O排放高峰出现的主要驱动力;土壤表层含水量偏低是旱季出现土壤N2O吸收现象的主要原因. 土壤水分、土壤温度、施用氮肥和作物参与均在不同程度上影响N2O排放, 土壤水分是影响N2O排放的关键因子, 避免水稻季土壤频繁干湿交替或控制旱季土壤水分(表层土壤含水孔隙率介于50%～70%)可有效抑制N2O排放. |
| 关 键 词： | N2O排放 水稻-油菜轮作 成都平原 影响因子 成都平原 水稻 油菜 轮作系统 氧化亚氮排放 Basin Chengdu Plain system rotation 孔隙率 含水量 表层土壤 控制 干湿交替 关键因子 程度 施用氮肥 土壤温度 土壤水分 吸收现象 |
| 文章编号： | 1001-9332(2008)06-1277-06 |
| 收稿时间： | 2007-07-27 |
| 修稿时间： | 2007年7月27日 |
N2O emission from rice-rapeseed rotation system in Chengdu Plain of Sichun Basin |
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| YU Ya-jun,ZHU Bo,WANG Xiao-guo,XIANG Hong-yan,ZHENG Xun-hua.N2O emission from rice-rapeseed rotation system in Chengdu Plain of Sichun Basin[J].Chinese Journal of Applied Ecology,2008,19(6):1277-1282. | |
| Authors: | YU Ya-jun ZHU Bo WANG Xiao-guo XIANG Hong-yan ZHENG Xun-hua |
| Affiliation: | Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China. yuyajun0211@126.com |
| Abstract: | By using static chamber/gas chromatograph techniques, the N2O emission from rice-rapeseed rotation system in Chengdu Plain of Sichuan Basin was measured from June 2005 to June 2006, with its characteristics and affecting factors investigated. The results showed that the total emission of N2O in a rotation cycle was (8.3 +/- 2.8) kg x hm(-2) x a(-1), and the emission in rice season, rapeseed season and fallow season accounted for 30%, 65%, and 5% of the total, respectively. In rice season, the mean N2O flux was higher during alternative drainage and irrigation than during continuous flooding and drainage, and was roughly the same during continuous flooding and drainage. N application was the main driving factor for the appearance of N2O emission peak, and the lower moisture content in surface soil layer in rapeseed season and fallow season was the main cause inducing soil N2O absorption. Soil moisture, soil temperature, N application, and crop involvement affected the N2O emission to various extents, and soil moisture was the key factor affecting the N2O emission. To avoid the high frequency of dry and wet alternation in rice season or to regulate soil moisture content to a level of 50%-70% WFPS (percentage of water-filled pore space) in rapeseed season and fallow season could effectively decrease the N2O emission from the rice-rapeseed rotation system. |
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