植物生态学报 ›› 2015, Vol. 39 ›› Issue (7): 661-673.DOI: 10.17521/cjpe.2015.0063
初小静1,2, 韩广轩1,*(), 邢庆会1,2, 于君宝1, 吴立新3, 刘海防3, 王光美1, 毛培利1
出版日期:
2015-07-01
发布日期:
2015-07-22
通讯作者:
韩广轩
作者简介:
*作者简介:E-mail:
基金资助:
CHU Xiao-Jing1,2, HAN Guang-Xuan1,*(), XING Qing-Hui1,2, YU Jun-Bao1, WU Li-Xin3, LIU Hai-Fang3, WANG Guang-Mei1, MAO Pei-Li1
Online:
2015-07-01
Published:
2015-07-22
Contact:
Guang-Xuan HAN
About author:
# Co-first authors
摘要:
云量以及大气气溶胶含量变化引起的阴天和晴天会对局地的微气候环境产生综合效应, 影响地面接收的太阳辐射强度, 同时引起环境因子的变化, 最终对净生态系统CO2交换(NEE)产生影响。该文通过涡度相关系统以及微气象梯度观测系统, 对黄河三角洲芦苇(Phragmites australis)湿地NEE以及环境要素进行了观测。在自然条件下选择12对相邻阴天和晴天数据, 在生物要素(生物量、叶面积指数)、土壤水分以及养分特征保持不变的前提下, 揭示了阴天和晴天变化对湿地生态系统NEE的光响应和温度响应的影响。结果表明: 12对阴天和晴天生态系统NEE的日平均动态均呈“U”型曲线, 但阴天NEE的变幅较小。晴天条件下湿地生态系统NEE的日均值显著高于阴天(p < 0.01)。阴天和晴天湿地生态系统NEE与光合有效辐射(PAR)之间均呈直角双曲线关系, 但晴天条件下, 最大光合速率(Amax)显著大于阴天(p < 0.01), 同时白天生态系统呼吸(Reco,daytime)也显著大于阴天(p < 0.01)。不论阴天还是晴天, Reco,daytime与气温均呈显著的指数关系。晴天湿地生态系统呼吸的温度敏感系数Q10 (5.5)远大于阴天(1.9)。阴天和晴天昼间PAR差值以及气温差值对NEE差值的协同影响达到63%。
初小静, 韩广轩, 邢庆会, 于君宝, 吴立新, 刘海防, 王光美, 毛培利. 阴天和晴天对黄河三角洲芦苇湿地净生态系统CO2交换的影响. 植物生态学报, 2015, 39(7): 661-673. DOI: 10.17521/cjpe.2015.0063
CHU Xiao-Jing,HAN Guang-Xuan,XING Qing-Hui,YU Jun-Bao,WU Li-Xin,LIU Hai-Fang,WANG Guang-Mei,MAO Pei-Li. Net ecosystem exchange of CO2 on sunny and cloudy days over a reed wetland in the Yellow River Delta, China. Chinese Journal of Plant Ecology, 2015, 39(7): 661-673. DOI: 10.17521/cjpe.2015.0063
图1 黄河三角洲湿地生态系统2013年生长季12对阴天和晴天的净生态系统CO2交换(NEE)与光合有效辐射(PAR)的日动态。黑线代表晴天PAR, 灰线代表阴天PAR。
Fig. 1 Diurnal changes in net ecosystem exchange of CO2 (NEE) and photosynthetically active radiation (PAR) on the 12 paired-days (i.e., a sunny day and an adjacent cloudy day) during the 2013 growing season in the Yellow River Delta wetland. Black and grey solid lines represent PAR on sunny and cloudy days, respectively.
图2 2013年黄河三角洲湿地生长季阴天和晴天净生态系统CO2交换(NEE)、光合有效辐射(PAR)与气温(T)的平均日动态(平均值±标准误差)。***, p < 0.001。
Fig. 2 Average diurnal variations of net ecosystem exchange of CO2 (NEE), photosynthetically active radiation (PAR) and air temperature (T) on sunny days and cloudy days during the 2013 growing season in the Yellow River Delta. Bars represent standard errors of the means of 12 sunny days and 12 adjacent cloudy days (mean ± SE). ***, p < 0.001.
图3 2013年黄河三角洲湿地生长季阴天和晴天昼间生态系统CO2交换(NEE)和光合有效辐射(PAR)的关系。黑线代表晴天拟合曲线, 灰线代表阴天拟合曲线。
Fig. 3 Relationships between daytime net ecosystem exchange of CO2 (NEE) and photosynthetically active radiation (PAR) between sunny days and cloudy days during the 2013 growing season in the Yellow River Delta wetland. Black solid line represents fitting curve of sunny days, and grey line represents fitting curve of cloudy days.
图4 2013年黄河三角洲湿地生长季阴天和晴天昼间生态系统呼吸(Reco,daytime)和气温(T)的关系。黑线代表晴天拟合曲线, 灰线代表阴天拟合曲线。
Fig. 4 Relationships between daytime ecosystem respiration (Reco,daytime) and air temperature (T) on sunny days and cloudy days during the 2013 growing season in the Yellow River Delta wetland. Black solid line represents fitting curve of sunny days, and grey line represents fitting curve of cloudy days.
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表1 2013年湿地生态系统阴天和晴天净生态系统CO2交换(NEE)和光合有效辐射(PAR)根据Michaclis-Menten模型(方程(3))模拟参数的比较
Table 1 Comparison of the analog parameters from daytime net ecosystem exchange of CO2(NEE) and photosynthetically active radiation (PAR) using a Michaelis-Menten model (Eq.(3)) between sunny days and cloudy days in the wetland
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方程 Equation | R2 | p | n | |
---|---|---|---|---|
晴天 Sunny day | NEE = -0.005PAR - 0.28T + 4.06 | 0.41 | <0.001 | 288 |
阴天 Cloudy day | NEE = -0.006PAR - 0.107T + 2.67 | 0.42 | <0.001 | 288 |
阴天和晴天差量 Difference between sunny and cloudy days | ΔNEE = -0.004ΔPAR - 0.123ΔT - 2.54 | 0.63 | <0.001 | 288 |
表2 多元回归分析黄河三角洲湿地生长季阴天和晴天光合有效辐射(PAR)与气温(T)对净生态系统CO2交换(NEE), 阴天和晴天PAR差量(ΔPAR)与T差值(ΔT)对NEE差量(ΔNEE)的协同影响
Table 2 Estimated empirical coefficient of multiple liner regression models for changes in net ecosystem exchange (NEE) with photosynthetically active radiation (PAR) and air temperature (T) on sunny and cloudy days during the growing season in the Yellow River Delta
方程 Equation | R2 | p | n | |
---|---|---|---|---|
晴天 Sunny day | NEE = -0.005PAR - 0.28T + 4.06 | 0.41 | <0.001 | 288 |
阴天 Cloudy day | NEE = -0.006PAR - 0.107T + 2.67 | 0.42 | <0.001 | 288 |
阴天和晴天差量 Difference between sunny and cloudy days | ΔNEE = -0.004ΔPAR - 0.123ΔT - 2.54 | 0.63 | <0.001 | 288 |
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