地理科学进展 ›› 2004, Vol. 23 ›› Issue (6): 63-70.doi: 10.11820/dlkxjz.2004.06.008

• 地表通量监测 • 上一篇    下一篇

基于土地利用/覆被分类系统估算 碳储量的差异——以海南岛森林为例

张镱锂1, 张 玮1,3, 丁明军2,3   

  1. 1. 中国科学院地理科学与资源研究所, 北京 100101;
    2. 中国科学院西北高原生物研究所, 西宁 810008;
    3. 中国科学院研究生院, 北京 100039
  • 收稿日期:2004-09-01 修回日期:2004-10-01 出版日期:2004-11-25 发布日期:2004-11-25
  • 作者简介:张镱锂(1962-)男,吉林人,研究员。从事生物地理学、土地利用和土地覆被的理论和应用基础研究。发表论著50余篇,成果获省部级奖励4次。E-mail:zhangyl@igsnrr.ac.cn
  • 基金资助:

    中国科学院地理科学与资源研究所知识创新工程主干项目(CXIOG-E01-01)。

The Difference of Computing Carbon Stocks Caused by Land Use/Cover Classifications ——A Case Studied in Hainan Province

ZHANG Yili1, ZHANG Wei1,3, DING MingJun2,3   

  1. 1. Institute of Geographical Sciences and Natural Resources Research. CAS, Beijing 100101 China;
    2. Northwest Institute of Plateau Biology. CAS, Xi’ning 810008 China;
    3. Graduate School of the Chinese Academy of Sciences, Beijing 100039 China
  • Received:2004-09-01 Revised:2004-10-01 Online:2004-11-25 Published:2004-11-25

摘要:

土地利用/覆被分类系统是碳蓄积研究的依据,然而各种碳蓄积研究所采用的土地利用/覆被分类系统不尽相同。根据1993年海南林业资源二类调查资料,我们按照USGS土地利用/覆被、LCCS土地覆被和中国科学院土地资源三种分类系统所定义的类别进行分类并计算了各自的碳储量和碳密度,为碳储量的进一步精确估算和土地覆被分类系统研制提供重要的科学依据。结果发现,(1)不同的土地利用/覆被分类系统所对应的总碳储量以及平均碳密度都有了明显的差别。林业调查资料的植被分类、FAO 土地覆被分类系统(LCCS)、USGS 土地利用/土地覆被分类系统以及我国学者常用的中国科学院土地资源分类系统的碳蓄积量(Tg C)分别是28.98、28.71、21.04和21.04;碳密度(t C/ha)分别是31.24、30.95、22.68和22.68。(2)土地利用分类系统和土地覆被分类系统之间的结果具有较大差异,其碳储量相差7.67~7.94 Tg C,碳密度则相差8.27~8.56 t C/ha;差距在26.47%~37.74%之间。与其他学者研究结果比较发现,土地利用/覆被分类系统造成的碳蓄积差异的变化方向是不定的,取决于具体的分类系统和材积—生物量函数。不同土地利用/覆被分类系统对于植被划分的不同,导致了材积—生物量回归方程和类别面积的差异是造成碳蓄积和碳密度估算差异的根本原因。目前常用的土地利用/覆被分类系统在估算碳蓄积中存在一定问题,不适合于高精度的碳蓄积计算。体现地表植被生物量差异、植被叶型和外貌特征、种类及树龄差异等内涵的土地利用/覆被分类系统利于陆地碳循环研究的深化。

关键词: 海南岛, 森林植被, 碳储量差异, 土地利用/土地覆被

Abstract:

The classifications of land use/cover are basis of computing carbon stocks. However they differ from each other in various carbon storage researches. Based on the National Forest Resource Inventory database of Hainan Province in 1993, we classified the data according to the different land use/cover classifications: USGS Land use/cover Classification, LCCS Land cover Classification and CAS Land Resource Classification, and calculated the carbon stocks and densities. The results may help in accurate carbon estimation and classification researches. It was shown that there was a difference between each classification in carbon stocks and densities. Based on National Forest Resource Inventory database, Anderson Land use/cover Classification, LCCS Land cover Classification and CAS Land Resource Classification the carbon stocks (Tg C) were 28.98, 28.71, 21.04 and 21.04, respectively; the carbon densities (t C/ha) were 31.24, 30.95, 22.68 and 22.68, respectively. What is more, the differences between land use and land cover classifications were distinct: 7.67~7.94 Tg C in carbon stocks as well as 8.27~8.56 t C/ha in carbon densities. In comparation with other scholar’s work, the increase or decrease of carbon stocks was not definite according to specific classifications and BEF functions. Different classifications of land use/covers leading to different BEF functions and areas caused the disparate results. Although there were several different land use/cover classifications, they had difficulties in accurate computing carbon storage. Thus the different biomass, different leaf and figure types, different species and different forest age classes are needed in a land use/cover classification for farther carbon cycle researches.

Key words: difference of carbon stocks, forests Hainan, land use/land cover