| 香溪河库湾春季pCO2与浮游植物生物量的关系 |
| 摘要点击 4456 全文点击 1910 投稿时间：2012-08-13 修订日期：2012-10-15 |
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| 中文关键词 三峡水库 香溪河库湾 二氧化碳分压 叶绿素a 碳通量 |
| 英文关键词 Three Gorges Reservoir Xiangxi Bay pCO2 Chl-a CO2 flux |
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| 中文摘要 |
| 测定了春季香溪河库湾的水温(WT)、pH、HCO3-浓度、溶氧(DO)及叶绿素a(Chl-a)浓度等参数. 根据化学平衡和亨利定律计算二氧化碳分压(pCO2),以薄层扩散模型计算碳通量. 结果表明,香溪河库湾春季表层水体pCO2在8.34~168.70 μatm间波动,平均为49.01 μatm. 空间上,pCO2自上游到河口呈明显上升趋势,Chl-a浓度则逐渐下降. 时间上,昼夜pCO2在74.43~168.70 μatm间波动,平均为117.92 μatm,Chl-a浓度在2.22~4.55 mg·m-3之间,平均为3.04 mg·m-3. 香溪河库湾春季表层水体pCO2与Chl-a浓度之间存在极显著的负相关关系(r=-0.844, P<0.01),浮游植物光合作用是pCO2的主要影响因子. 香溪河库湾春季是CO2的汇,CO2吸收速率为-35.17 mmol·(m2·d)-1. |
| 英文摘要 |
| Water temperature (WT), pH, HCO3-, dissolved oxygen and the concentration of Chl-a in Xiangxi Bay were measured in spring. The partial pressure of carbon dioxide was calculated by the chemical balance and Henry's Law while CO2 flux by the thin-layer diffusion model. Results showed that pCO2 of surface water in Xiangxi Bay varied from 8.34μatm to 168.70 μatm with a mean of 49.01 μatm. pCO2 increased along the stream with Chl-a decreased from upstream to the estuary. The mean of pCO2 was 117.92 μatm on the diurnal scale, ranging from 74.43 μatm to 168.70 μatm, and the mean concentration of Chl-a was 3.04 mg·m-3 with the range from 2.22 mg·m-3 to 4.55 mg·m-3. There were statistically significant negative correlations between values for pCO2 and Chl-a (r=-0.844, P<0.01). Phytoplankton photosynthesis in Xiangxi Bay played a crucial role in the spatial and temporal distribution of pCO2. The undersaturation observed suggests that surface waters in Xiangxi Bay represented a sink for atmospheric CO2 in spring, and the exchange rate of CO2 was estimated to be -35.17 mmol·(m2·d)-1. |
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