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模拟增温对黄河三角洲滨海湿地非生长季土壤呼吸的影响
Alternative TitleEffects of elevated temperature on soil respiration in a coastal wetland during the nongrowing season in the Yellow River Delta, China
孙宝玉; 韩广轩; 陈亮; 初小静; 邢庆会; 吴立新; 朱书玉
2017-03-08
Source Publication植物生态学报
ISSN1005-264X
Volume40Issue:3Pages:269-273
Contribution Rank(1)中国科学院烟台海岸带研究所中国科学院海岸带环境过程与生态修复重点实验室;(2)中国科学院大学;(3)聊城大学环境与规划学院;(4)山东省黄河三角洲国家级自然保护区管理局;
Abstract冬季土壤呼吸能释放生长季所固存的碳,因而在陆地碳循环中占有重要地位。随着全球气候变暖,平均地表温度将升高0.3–4.8℃,且冬季增温更加明显,而温度的升高会促进更多CO2的释放。另外,滨海湿地地下水位浅,淡咸水交互作用明显,增温能引起土壤表层盐分升高,从而影响土壤呼吸。该研究以黄河三角洲滨海湿地为研究对象,采用红外辐射加热器模拟增温,研究了该地区非生长季土壤呼吸的日动态及季节动态,同时探讨了土壤呼吸对环境因子的响应机制。结果显示:日动态中,增温与对照的土壤呼吸速率变化趋势一致,为单峰曲线;在平均日变化中,整个非生长季不同处理的土壤呼吸速率无显著差异,而土壤温度和土壤盐分均为增温大于对照,并且土...
Keyword增温 土壤呼吸 非生长季 土壤盐分含量 滨海湿地 黄河三角洲
Department中科院海岸带环境过程与生态修复重点实验室
Funding Organization国家自然科学基金(41301083) ; 中国科学院科技服务网络计划项目(KFJ-EW-STS-127)
Indexed ByCSCD
Language中文
WOS Research AreaAims Winter soil respiration plays a crucial role in terrestrial carbon cycle, which could lose carbon gained inthe growing season. With global warming, the average near-surface air temperatures will rise by 0.3 to 4.8 °C.Winter is expected to be warmer obviously than other seasons. Thus, the elevated temperature can significantlyaffect soil respiration. The coastal wetland has shallow underground water level and is affected by the fresh waterand salt water. Elevated temperature can cause the increase of soil salinity, and as a result high salinity can limitsoil respiration. Our objectives were to determine the diurnal and seasonal dynamics of soil respiration in a coastalwetland during the non-growing season, and to explore the responses of soil respiration to environmental factors,especially soil temperature and salinity.Methods A manipulative warming experiment was conducted in a costal wetland in the Yellow River Delta using the infrared heaters. A complete random block design with two treatments, including control and warming,and each treatment was replicated each treatment four times. Soil respiration was measured twice a month during the non-growing season by a LI-8100 soil CO2 efflux system. The measurements were taken every 2 h for 24 h atclear days. During each soil respiration measurement, soil environmental parameters were determined simultaneously, including soil temperature, moisture and salinity.Important findings The diurnal variation of soil respiration in the warming plots was closely coupled with thatin the control plots, and both exhibited single-peak curves. The daily soil respiration in the warming was higherthan that in the control from November 2014 to January 2015. Contrarily, from March to April 2015. During thenon-growing seasons, there were no significant differences in the daily mean soil respiration between the twotreatments. However, soil temperature and soil salt content in the warming plots were significantly higher thanthose in the control plots. The non-growing season was divided into the no salt restriction period (November 2014to middle February 2015) and salt restriction period (middle February 2015 to April 2015). During non-growingseason, soil respiration in the warming had no significant difference compared with that in control. During the nosalt restriction period, soil respiration in the warming was 22.9% (p < 0.01) greater than the control when soil temperature at 10 cm depth in warming was elevated by 4.0 °C compared with that in control. However, experimentalwarming decreased temperature sensitivity of soil respiration (Q10). During salt restriction period, soil warmingdecreased soil respiration by 20.7% compared with the control although with higher temperature (3.3 °C), whichmay be attributed to the increased soil salt content (Soil electric conductivity increased from 4.4 ds·m–1 to 5.3ds·m–1). The high water content can limit soil respiration in some extent. In addition, the Q10 value in the warminghad no significant difference compared with that in control during this period. Therefore, soil warming can notonly increase soil respiration by elevating soil temperature, but also decrease soil respiration by increasing soilsalt content due to evaporation, which consequently regulating the soil carbon balance of coastal wetlands
CSCD IDCSCD:5853841
Citation statistics
Document Type期刊论文
Identifierhttp://ir.yic.ac.cn/handle/133337/22089
Collection中科院海岸带环境过程与生态修复重点实验室
Corresponding Author韩广轩
Affiliation1.中国科学院烟台海岸带研究所中国科学院海岸带环境过程与生态修复重点实验室
2.中国科学院大学
3.聊城大学环境与规划学院
4.山东省黄河三角洲国家级自然保护区管理局
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GB/T 7714
孙宝玉,韩广轩,陈亮,等. 模拟增温对黄河三角洲滨海湿地非生长季土壤呼吸的影响[J]. 植物生态学报,2017,40(3):269-273.
APA 孙宝玉.,韩广轩.,陈亮.,初小静.,邢庆会.,...&朱书玉.(2017).模拟增温对黄河三角洲滨海湿地非生长季土壤呼吸的影响.植物生态学报,40(3),269-273.
MLA 孙宝玉,et al."模拟增温对黄河三角洲滨海湿地非生长季土壤呼吸的影响".植物生态学报 40.3(2017):269-273.
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