地球科学进展 ›› 1993, Vol. 8 ›› Issue (5): 13 -22. doi: 10.11867/j.issn.1001-8166.1993.05.0013

全球变化研究 上一篇    下一篇

稻田CH 4的传输
上官行健;王明星;陈德章;沈壬兴   
  1. 中国科学院大气物理研究所,北京100029
  • 收稿日期:1993-04-09 出版日期:1993-09-01

THE TRANSPORT OF METHANE IN THE RICE PADDY FIELDS

Shangguan Xingjian,Wang Mingxing,Chen Dezhang and Shen Renxing   

  1. Institute of Atmospheric Physics,Academia Sinica,Beijing 100029
  • Received:1993-04-09 Online:1993-09-01 Published:1993-09-01

通过对稻田CH4排放、土壤CH4产生率以及植物体CH4传输、气泡、液相扩散这三种排放路径的同时测量后发现:CH4氧化作用在下午CH4排放路径通畅时较小;阴雨天气造成CH4排放率降低会增加CH4在土壤中的氧化量。早稻CH4传输效率在6月上、中旬较高,晚稻则在水稻生长初期的7月下旬最高,这主要是两季水稻的生长季节中气候因子的差异造成的。只有在较短的时间尺度内,当水稻植物体、气候因素维持相对恒定时,CH4产生率和稻田甲烷排放才显出正相关性。 水稻植物体内有明显的CH4浓度梯度。水稻的切割控制实验发现,通过植物体排放CH4的比例随季节而变化,在进行单株植物体排放测量时发现了同样结果,早稻和晚稻CH4通过水稻植物体的传输平均分别占CH4总体排放的73.18%(43.07—97.88%〕及54.98%(11—99.95%);植物体对CH4排放的作用在早稻大于晚稻;水稻植物体排放CH4的能力的季节变化对早、晚稻类似,随着水稻的生长而不断增强,到水稻抽穗中期达到最大,以后则随水稻的成熟而变小;水稻植物体排放CH4的能力与水稻植物体的高度存在极大的线性正相关。土壤中CH4的浓度远远大于大气中的CH4含量(10—10~4倍),根部区域土壤CH4浓度小于水稻行间土壤中的;在垂直方向,CH4浓度在14cm深的土壤中最大,与土壤浅层有明显的梯度;CH4排放率与根部区域CH4浓度有极好的相关性。 早稻、晚稻通过气泡的CH4排放量分别占总数的24.14%及40.52%。在晚稻种植初期,丰富的有机物质、炎热的天气是气泡排放量很大的原因;在不种水稻的田中气泡排放要明显大于种有水稻的稻田;水稻田覆盖水中明确存在向上递减的CH4浓度梯度;早晚稻CH4通过液相扩散方式排放的CH4分别只占CH4总排放的2.68%及4.50%。

Simultaneous measurements of CH4 emission,CH4 production and transport through rice plant,gas bubble and diffusion in flooded water show that:low oxidation occurs in the afternoon when CH4 transport efficiency appears higher. CH4 emission rate is lower in cloudy and raining weather when the CH4 oxidation rate in the paddy soil higher. Higher transport efficiency appears in early and middle June for the early rice,while for the late rice,it is in late July shortly after rice is transplanted. This difference is mainly caused by different weather trend in the individual rice growing period. Because the relative importance of methane oxidation is not the same in the whole rice growing period,the seasonal variation of CH4 production rate in the paddy soil can not explain that of CH4 emission. Better correlation between the two parameters may happen only in a short time period when rice growing status and weather condition remain relatively stable.Obvious concentration gradient is observed in the internal space of rice plant. Higher CH4 emission rates have been measured in the weeds-growing field than in unplanted field , and the former is very similar to that of rice-planted field. The seasonal variation in non-rice-planted field is different from that in rice planted field,with no peak before harvesting. Experiments show that the portion emitted through rice plant is changing during the growing season. For early and late rice,methane emitted through rice plant accounts in average for 73. 18% (43. 07-97. 88%) and 54. 98% (11. 00 - 99. 95%) of the total flux re- spectively. The above result shows that the role of rice plant in methane emission is greater for early rice. The seasonal variation of transport ability of rice plant appears similar for early and late rice, which increases with the time and reaches maximum at mid-heading stage,then decreases with rice riping. The CH4 transport ability of rice correlates well linearly with the plant height. CH4 concentration in soil pore water is much higher than that in the atmosphere(10 -104 times). Less amount of methane desolved in root soil has been found than that in the soil between rice-plants. Maximum concentration of CH4 appears at the depth of 14cm,appearent concentra tion gradient is observed along verticeal direction. Very good correlation between CH4 emission and the amount desolved in root soil has been observed.The CH4 emitted by gas bubble accounts in average for 24. 14% and 40. 52% of the total flux respectively for early and late rice. At the beginning of late rice planting, the aboundance of organic matter in the soil and hot weather condition make the ebulltion flux very high. The CH4 bubble emission is higher in the unplanted field than that in rice-planted one. The concentration gradient to the water surface in flooded water can be easily seen, which accounts for 2. 68 % and 4. 50% of total flux for early and late rice respectively.

[1]Helmut Schütz,Wolfgang Seiler,Ralf Conrad. Processes involved in formation and emission of methane in rice paddies[J]. Biogeochemistry, 1989,7(1) .
[2]Holzaptel-Pschorn A,Conrad R and Seiler W. Production,oxidation and emission of methane in rice paddies .FEMS Microbiology Ecology, 1985, 31 :343-351 .
[3]Isamu Nouchi et al. Methanism of methane transport from the rhizosphere to the atmosphere through rice plants .Plant Physical, 1990, 94 :59-66 .
[4]Holzapfel-Pschorn A. Conrad R and Seiler W.Effects of regetation on the emission of methane by submerged paddy soil .Plant and Soil, 1986, 92 :223-233 .

[1] 王全九,孙燕,宁松瑞,张继红,周蓓蓓,苏李君,单鱼洋. 活化灌溉水对土壤理化性质和作物生长影响途径剖析[J]. 地球科学进展, 2019, 34(6): 660-670.
[2] 宋朝清,刘伟,陆海波,袁文平. 基于通量测量的稻田甲烷排放特征及影响因素研究[J]. 地球科学进展, 2019, 34(11): 1141-1151.
[3] 于文涛, 李静, 柳钦火, 曾也鲁, 尹高飞, 赵静, 徐保东. 中国地表覆盖异质性参数提取与分析[J]. 地球科学进展, 2016, 31(10): 1067-1077.
[4] 吴金水, 葛体达, 祝贞科. 稻田土壤碳循环关键微生物过程的计量学调控机制探讨[J]. 地球科学进展, 2015, 30(9): 1006-1017.
[5] 鲁易, 张稳, 李婷婷, 周筠珺. 大气甲烷浓度变化的源汇因素模拟研究进展[J]. 地球科学进展, 2015, 30(7): 763-772.
[6] 蔡福, 明惠青, 纪瑞鹏, 冯锐, 米娜, 赵先丽, 张玉书. 玉米冠层辐射传输参数优化对陆气通量模拟的影响[J]. 地球科学进展, 2014, 29(5): 598-607.
[7] 李玉红, 詹力扬, 陈立奇. 北冰洋CH 4研究进展[J]. 地球科学进展, 2014, 29(12): 1355-1361.
[8] 吴自军,任德章,周怀阳. 海洋沉积物甲烷厌氧氧化作用(AOM)及其对无机硫循环的影响[J]. 地球科学进展, 2013, 28(7): 765-773.
[9] 赵吉,李靖宇,周玉,白玉涛,于景丽. 甲烷氧化与氨氧化微生物及其耦合功能[J]. 地球科学进展, 2012, 27(6): 651-659.
[10] 孙治雷,何拥军,李 军,黄 威,李 清,李季伟,王 丰. 海洋环境中甲烷厌氧氧化机理及环境效应[J]. 地球科学进展, 2012, 27(11): 1262-1273.
[11] 阳勇, 陈仁升. 冻土水文研究进展[J]. 地球科学进展, 2011, 26(7): 711-723.
[12] 于新生, 李丽娜,胡亚丽,兰志刚. 海洋中溶解甲烷的原位检测技术研究进展[J]. 地球科学进展, 2011, 26(10): 1030-1037.
[13] 陈修治,陈水森, 李丹, 苏泳娴, 钟若飞. 被动微波遥感反演地表温度研究进展[J]. 地球科学进展, 2010, 25(8): 827-835.
[14] 万国江,郑向东,Lee H N,Bai Z G,万恩源,王仕禄,杨伟,苏菲,汤洁,王长生,黄荣贵,刘鹏. 黔中气溶胶传输的210Pb和7Be示踪:II.月及年时间尺度的剖析[J]. 地球科学进展, 2010, 25(5): 505-514.
[15] 万国江,郑向东,Lee H N,Bai Z G,万恩源,王仕禄,杨伟,苏菲,汤洁,王长生,黄荣贵,刘鹏. 黔中气溶胶传输的 210Pb和 7Be示踪:Ⅰ.周时间尺度的解释[J]. 地球科学进展, 2010, 25(5): 492-504.
阅读次数
全文


摘要