桂林会仙岩溶湿地典型水生植物δ13C特征与固碳量估算
为促进目前岩溶碳汇稳定性和速率等科学问题的深入研究,在分析桂林会仙岩溶湿地主要水生植物碳同位素的基础上,利用基于碳酸酐酶活性与植物碳同位素值显著正相关的二端元模型,估算了不同植物利用光合作用固定HCO3-的比例.结果表明,湿地核心区沉水植物光合作用固定HCO3碳量在4.86～64.73tC/（a·km2）之间,挺水植物为15.68～453.0] tC/（a·km2）,平均值为76.74 tC/（a·km2）.按平均值计算会仙湿地水生植物光合作用固定HCO3碳量为4 466.27 tC/a,即在会仙湿地岩溶地下河补给的HCO3中约47％被水生植物光合作用固定.水生植物光合作用固碳效果明显,是碳汇...
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| Published in | 中国岩溶 Vol. 32; no. 3; pp. 247 - 252 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国地质科学院岩溶地质研究所/国土资源部、广西壮族自治区岩溶动力学重点实验室,广西桂林,541004
2013
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1001-4810 |
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| Summary: | 为促进目前岩溶碳汇稳定性和速率等科学问题的深入研究,在分析桂林会仙岩溶湿地主要水生植物碳同位素的基础上,利用基于碳酸酐酶活性与植物碳同位素值显著正相关的二端元模型,估算了不同植物利用光合作用固定HCO3-的比例.结果表明,湿地核心区沉水植物光合作用固定HCO3碳量在4.86～64.73tC/（a·km2）之间,挺水植物为15.68～453.0] tC/（a·km2）,平均值为76.74 tC/（a·km2）.按平均值计算会仙湿地水生植物光合作用固定HCO3碳量为4 466.27 tC/a,即在会仙湿地岩溶地下河补给的HCO3中约47％被水生植物光合作用固定.水生植物光合作用固碳效果明显,是碳汇研究中不容忽视的一个十分重要的问题. |
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| Bibliography: | 45-1157/P aquatic vegetation; carbon isotope; karst wetland; carbon fixation; Huixian , Guilin ZHANG Cheng,XIE Yun-qiu,NING Liang-dan,YU Hong,WANG Jin-liang,LI Feng（ 1.Institute of Karst Geology, CAGS / Key Laboratory of Karst Dynamics, MLR ＆ GZAR, Guilin, Guangxi 541004, China;） Currently,the stability and the velocity of karst carbon sink are two major scientific questions urgently need to be answered.Characteristics of δ13C in major aquatic vegetations in the Huixian karst wetland are discussed in this paper,and the percentages of photosynthetic carbon fixation are estimated by means of double-meta model in which remarkable positive relationship is presented between carbonate anhydrase activity and the value of plant carbon isotope.The Huixian karst wetland,located in Huixian town,Lingui county and 30 km away from Guilin city,is the largest natural wetland in low-altitude area of subtropical zone of China.The wetland is mainly sourced by karst groundwater.To understand the characteristics of δ3C value in diff |
| ISSN: | 1001-4810 |