| 张静,任志远,张嘉琪.汾河中下游土地生态系统固碳释氧动态测评[J].干旱地区农业研究,2018,36(2):242~249 |
| 汾河中下游土地生态系统固碳释氧动态测评 |
| Dynamic assessment of the values of CO2 fixation and O2 release in the middle and lower reaches of Fenhe river Basin |
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| DOI：10.7606/j.issn.1000-7601.2018.02.35 |
| 中文关键词: 汾河中下游流域 NPP 固碳释氧价值量 动态测评 |
| 英文关键词:the middle and lower reaches of Fenhe river Basin Net Primary Productivity (NPP) the values of CO2 fixation and O2 release dynamic assessment |
| 基金项目:国家自然科学基金项目(41371523)；教育部人文社会科学重点研究基地项目(14JJD840004) |
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| 中文摘要: |
| 本文基于光能利用率模型测算净第一性生产(NPP)物质量，通过光合作用方程式换算固定CO2和释放O2的物质量，并采用造林成本法和工业制氧法对汾河中下游流域的固碳释氧价值量进行估算，旨在定量评价其固碳释氧价值的时空动态，为改善区域生态环境提供一定的参考。结果表明：(1) 2000—2010年汾河中下游流域NPP物质总量共增加了18.3%，耕地的NPP物质总量占研究区NPP物质总量的50%以上，主要在于汾河下游为山西省主要的粮棉产区；(2) 从固碳释氧来看，释氧O2物质量随着固定CO2物质量的增加而增加。固碳释氧价值总量由2000年的467.38×107元增加到552.24×107元，净增84.86×107元，增长率为18.16%。从大到小排序为：耕地>草地>林地>其他地。(3) 从县域行政空间来看，万荣县的单位面积NPP价值量和单位面积固碳释氧价值量均最高，而介休市均最低。表明汾河下游固碳释氧价值量较高，中游由于城市化进程的加快固碳释氧价值量较低，近年来退耕还林政策的落实使研究区生态环境趋势出现好转。但由于水热条件限制，区域林地增加不明显，以草地增加较为显著。 |
| 英文摘要: |
| Based on light energy utilization model, Thisarticle calculated Net Primary Productivity. The photosynthesis equation was used to convert NPP to amount of CO2 fixation and O2 releasing and quantitatively computed the values of fixing CO2 and O2 releasing by using afforestation cost method and industrial oxygen generation method, in order to evaluate spatio-temporal dynamic changes of fixing CO2 and O2 releasing and provide some references for improving the regional ecological environment. The results showed: (1) the total amount of NPP increased by 18.3% during 2000—2010 in the middle and lower reaches of Fenhe river Basin. The amount of cropland NPP accounted for more than 50% of NPP in the study area and mainly distributed in the lower reaches of Fenhe River Basin, which is the main grain and cotton production area in Shanxi province. (2) From the point of fixing CO2 and O2 releasing, the quality of O2 releasing increased with the increasing of fixed CO2. The total value of fixing CO2 and O2 releasing increased to 552.24×107 yuan in 2010 from 467.38×107 yuan in 2000. There were a net increase of 84.86×107 yuan and an increasing rate of 18.16%. The total value of fixing CO2 and O2 releasing was “cropland＞grassland＞forestland＞other land” in orders from high to low. (3) From the perspective of the county administrative space, the value of NPP per unit area and the value of fixing CO2 and O2 release per unit area was the highest in Wanrong County, while the lowest was in Jiexiu City. Overall, the value of fixing CO2 and O2 release was higher in the lower reaches of Fenhe River Basin and the value of fixing CO2 and O2 releasing was lower in the middle reaches of Fenhe River Basin due to the rapid urbanization. In recent years, the implementation of the policy of returning cropland to forestland has improved the ecological environment in the study area. However, due to the limitation of water and heat conditions, forestland increase was not obvious i, and grassland increase was more significant. |
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