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| 西南岩溶区农田生态系统岩溶作用及碳汇效应：以重庆南川市三泉镇为例 | |
| 引用本文： | 罗怀良,袁道先,陈浩.西南岩溶区农田生态系统岩溶作用及碳汇效应：以重庆南川市三泉镇为例[J].地学前缘,2011,18(6):64-71. |
| 作者姓名： | 罗怀良 袁道先 陈浩 |
| 作者单位： | 1. 西南土地资源评价与监测教育部重点实验室；四川师范大学地理与资源科学学院,四川成都610101 2. 西南大学地理科学学院,重庆400715／中国地质科学院岩溶研究所国土资源部岩溶动力学重点实验室,广西桂林541004 3. 绵阳师范学院资源环境工程学院,四川绵阳,621000 |
| 基金项目： | 国家自然科学基金重点项目“我国典型地区地质作用与碳循环研究”(40231008);西南大学自然地理学重点学科开放基金项目 |
| 摘 要： | 岩溶地区的碳循环是地质作用和生物作用最好的结合点，系统研究农田生态系统中石灰岩溶蚀作用强度对精确估算岩溶作用的碳汇效应具有重要意义。通过在重庆南川市三泉镇选择菜地、旱地、冬水田、两季田、草地、未利用地等样地类型进行以一个水文年为周期的标准溶蚀试片溶蚀试验、土壤剖面与植被样方观测以及土壤、标准溶蚀试片样品分析，探讨了农田... |
| 关 键 词： | 农田生态系统 岩溶作用 碳汇 南川市三泉镇 |
Corrosion of limestone in farmland ecosystems and its carbon sink effect in the karst area of Southwest China:A case study in Sanquan Town,Nanchuan City,Chongqing Municipality |
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| Luo Huailiang,Yuan Daoxian,Chen Hao.Corrosion of limestone in farmland ecosystems and its carbon sink effect in the karst area of Southwest China:A case study in Sanquan Town,Nanchuan City,Chongqing Municipality[J].Earth Science Frontiers,2011,18(6):64-71. | |
| Authors: | Luo Huailiang Yuan Daoxian Chen Hao |
| Institution: | 1.Key Laboratory of Land Resources Evaluation and Monitoring in Southwest,Ministry of Education;Faculty of Geography and Resources Sciences,Sichuan Normal University,Chengdu 610101,China 2.School of Geographical Sciences,Southwest University,Chongqing 400715,China 3.Institute of Karst Geology,Chinese Academy of Geological Sciences;Karst Dynamics Laboratory,Ministry of Land and Resources,Guilin 541004,China 4.School of Resources and Environment Engineering,Mianyang Normal College,Mianyang 621000,China |
| Abstract: | The carbon cycle in karst area is the perfect joint combining geological process with biological process,so it is very important for accurately estimating the carbon sink effect of karstification to systemically study limestone weathering in farmlands.Taking a hydrological year as a period,corrosion experiment of the standard limestone tablets in farmland samples such as year-round flooded paddy field,seasonal rotation paddy field,vegetation plot,dry land,grassland,unutilized land and so on has been observed.Based on the limestone corrosion experiment,on the investigation of soil profiles and biomass of vegetation in the same farmlands,and on the analytical experimentation of soil and the standard limestone tablets,the characteristics of corrosion of limestone in farmland ecosystems in the area and its influence factors have been analyzed.The result shows that the corrosion ratio decreases successively from seasonal rotation paddy field,to vegetation plot,to dry land and to year-round flooded paddy field.There are obvious differences,and complex changes among corrosion ratio at different soil layers of farmlands in Sanquan Town,Nanchuan City.Karstification in farmland ecosystem in the area is more intense than that in non-farmland ecosystems,and the average annual flux of CO2 absorbed by karstification in farmland ecosystems in the town is 163.1264×105 gC/(km2·a).The annual flux of CO2 absorbed by karstification in farmland ecosystems in the region is larger than that in non-farmland of other areas at the same latitude.Principal component analysis shows that karstification in farmland in the region is mainly affected by the location of soil layer,the kinds of farmland,the seasonal change of farmland and the matter sources of soil in farmland ecosystem. |
| Keywords: | farmland ecosystem karstification carbon sink Sanquan Town Nanchuan City |
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