| 干湿交替对新疆绿洲农田土壤CO2排放的影响 |
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| 引用本文： | 牛百成,赵成义,冯广龙,唐钢梁.干湿交替对新疆绿洲农田土壤CO2排放的影响[J].水土保持通报,2016,36(3):74-80. |
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| 作者姓名： | 牛百成 赵成义 冯广龙 唐钢梁 |
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| 作者单位： | 1. 中国科学院 新疆生态与地理研究所 荒漠与绿洲生态国家重点实验室，新疆 乌鲁木齐 830011; 中国科学院大学，北京 100049;2. 中国科学院 新疆生态与地理研究所 荒漠与绿洲生态国家重点实验室,新疆 乌鲁木齐,830011 |
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| 基金项目： | 中德科学基金研究交流中心项目“塔里木盆地绿洲棉田土壤固碳研究”（GZ867） |
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| 摘 要： | 目的]分析不同土壤水分变化及干湿交替对土壤CO_2排放的影响,为绿洲农田土壤碳循环提供科学依据。方法]选取新疆绿洲棉田土壤,通过室内控制模拟试验,以及用气相色谱仪分析CO_2浓度。结果](1)与60%WFPS(土壤充水孔隙度)相比,40%WFPS对土壤CO_2排放起到了显著的抑制作用(p0.05),而80%WFPS对土壤CO_2排放无显著性影响(p0.05)。培养结束时,与60%WFPS的土壤CO_2累积排放量相比,40%WFPS的土壤CO_2累积排放量降低26%(p0.05),而80%WFPS的土壤CO_2累积排放量仅增加0.04%(p0.05)。(2)多次干湿交替循环后,干湿交替处理下的土壤CO_2累积排放量显著低于恒湿处理。在不同干旱强度处理中,重度干旱(SD)处理对土壤CO_2排放速率响应程度大于适度干旱(MD)处理,但多次干湿交替循环后,SD处理下的土壤CO_2累积排放量却显著小于MD处理。随干湿交替循环次数的增加,干湿交替对土壤CO_2排放速率的影响显著降低,特别是对土壤CO_2排放速率最高值的影响最大。结论]在新疆绿洲棉田土壤中,干湿交替能降低土壤CO_2排放量,降低量随干旱强度的增大而增大。
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| 关 键 词： | 绿洲农田 土壤水分 干湿交替 土壤CO2排放 |
| 收稿时间： | 2015/3/26 0:00:00 |
| 修稿时间： | 2015/6/16 0:00:00 |
Effects of Alternate Drying and Wetting on Soil CO2 Emissions in Oasis Farmland of Xinjiang Region |
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| NIU Baicheng,ZHAO Chengyi,FENG Guanglong and TANG Gangliang.Effects of Alternate Drying and Wetting on Soil CO2 Emissions in Oasis Farmland of Xinjiang Region[J].Bulletin of Soil and Water Conservation,2016,36(3):74-80. |
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| Authors: | NIU Baicheng ZHAO Chengyi FENG Guanglong and TANG Gangliang |
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| Institution: | State Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China;University of Chinese Academy of Sciences, Beijing 100049, China,State Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China,State Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China and State Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China;University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Objective] To evaluate the effects of soil water change and alternate drying and wetting on soil CO2 emissions in order to provide basis for soil carbon cycle in oasis farmland.Methods] Soil samples were taken from oasis farmland in Xinjiang region, which was used for incubation experiment in laboratory. CO2 concentration was analyzed by meteorological chromatograph.Results] (1) Compared with 60% WFPS(water filling soil porosity), 40% WFPS had a significant inhibiting effect on soil CO2 emissions(p<0.05), while 80% WFPS was no significant influence on soil CO2 emissions(p<0.05). At the end of the experiment, compared with 60% WFPS, accumulation of soil CO2 emissions of 40% WFPS was reduced by 26%(p<0.05), while accumulation of soil CO2 emissions of 80% WFPS was increased by 0.04%(p>0.05). (2) After multiple wet dry cycling, soil CO2 accumulative emissions under alternate drying and wetting condition was significant lower than that of constant moisture treatment(p<0.05). Under different drought intensity, the effect of severe drought on soil CO2 emission rate was higher than that of the moderate drought. But after multiple wet dry cycling, the effect of severe drought on the accumulation of soil CO2 emissions was lower than that of moderate drought(p<0.05). With the increased of drying and wetting alternation, the effects on soil CO2 emission rate was reduced significantly, especially for maximum soil CO2 emission rate.Conclusion] Drying and wetting alternation can reduce soil CO2 emissions, and the amount of reduction increases with the increasing of drought intensity in Xinjiang oasis soil. |
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| Keywords: | oasis farmland soil moisture drying and wetting alternation soil CO2 emissions |
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