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| 太湖地区冬小麦田与蔬菜地N2O排放对比观测研究 | |
| 引用本文： | 姚志生,郑循华,周再兴,谢宝华,梅宝玲,顾江新,王定勇.太湖地区冬小麦田与蔬菜地N2O排放对比观测研究[J].气候与环境研究,2006,11(6):691-701. |
| 作者姓名： | 姚志生 郑循华 周再兴 谢宝华 梅宝玲 顾江新 王定勇 |
| 作者单位： | 1. 西南农业大学资源环境学院,重庆,400716;中国科学院大气物理研究所,北京,100083 2. 中国科学院大气物理研究所,北京,100083 3. 中国科学院大气物理研究所,北京,100083;中国科学院研究生院,北京,100049 4. 西南农业大学资源环境学院,重庆,400716 |
| 基金项目： | 国家杰出青年科学基金项目40425010，国家自然科学基金资助项目40331014 |
| 摘 要： | 2003年11月8日至2004年6月5日对太湖地区相邻的蔬菜地和稻麦轮作生态系统的冬小麦田,在当季不施肥情况下的N2O排放进行了田间同步对比观测,分析了N2O排放时间变化以及土壤湿度、土壤温度、土壤速效氮含量和农业管理措施对N2O排放的影响。研究结果表明,小麦播种前的耕翻(表层大约7cm土壤旋耕)处理不会明显改变稻麦轮作农田整个旱地阶段的N2O排放总量,但却使小麦生长季初期的N2O排放明显减弱69%(p<0.01,p为相关概率),使小麦生长季后期的N2O排放明显偏高2.6倍(p<0.05),而对其余时间段的N2O排放作用不明显。与长期实行稻麦轮作的旱地阶段农田相比,由稻田改种蔬菜20多年的蔬菜地,其整个观测期的N2O排放总量比免耕处理小麦田同期的排放高85%(p<0.05),比耕翻处理小麦田同期的排放高99%(p<0.01)。蔬菜地N2O排放偏高的原因是土壤速效氮,特别是铵态氮含量明显偏高(p<0.01)。 |
| 关 键 词： | N2O排放 时间变化 控制因子 麦田 蔬菜地 |
| 文章编号： | 1006-9585(2006)06-0691-11 |
| 收稿时间： | 05 23 2005 12:00AM |
| 修稿时间： | 07 3 2006 12:00AM |
Nitrous Oxide Emission from Winter Wheat and Vegetable Fields in the Taihu Region: A Comparison Case Study |
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| YAO Zhi-Sheng,ZHENG Xun-Hu,ZHOU Zai-Xing,XIE Bao-Hu,MEI Bao-Ling,GU Jiang-Xin and WANG Ding-Yong.Nitrous Oxide Emission from Winter Wheat and Vegetable Fields in the Taihu Region: A Comparison Case Study[J].Climatic and Environmental Research,2006,11(6):691-701. | |
| Authors: | YAO Zhi-Sheng ZHENG Xun-Hu ZHOU Zai-Xing XIE Bao-Hu MEI Bao-Ling GU Jiang-Xin and WANG Ding-Yong |
| Institution: | 1 College of Resource and Environment, Southwest Agricultural University, Chongqing 400716 ;2 Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100083;3 The Graduate University of Chinese Academy of Sciences, Beijing 100049 |
| Abstract: | Based on the contrast observations on the nitrous oxide (N_ 2 O) emissions from the adjacent unfertilized vegetable field and winter wheat field of the rice-wheat rotation system in the Taihu region from 8 November 2003 to 5 June 2004, its temporal variation and the effects of soil moisture, soil temperature, available N contents and agriculture management practices were investigated and discussed. The results showed that spiral tillage by about 7cm deep in soil before winter wheat sowing had little significant effect on the total N_ 2 O emission during the non-rice period of the rotation cycle, but it periodically impacted the N_ 2 O emission fluxes. The tillage reduced the N_ 2 O emission fluxes during the early period after wheat sowing by about 68% (p<0.01) on average, increased the N_ 2 O emission fluxes during the late period of the wheat season by about 2.6 folds (p<0.05) on average, and had little effect during the remaindering period. The total N_ 2 O emission over the entire investigated period was significantly higher in the vegetable fields than that simultaneously observed in the non-tilled and tilled wheat fields by about 85% (p<0.05) and about 99% (p<0.01) , respectively. This difference is most likely attributed to the significantly higher available nitrogen content, especially higher ammonium content in the soil of the vegetable fields (p<0.01). |
| Keywords: | N_ 2 O emission temporal variation regulating factor wheat field vegetable field |
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