Historic Land Use and Carbon Estimates for South and Southeast Asia: 1880-1980 (NDP-046)

This data base contains estimates of land use change and the carbon content of vegetation for South and Southeast Asia for the years 1880, 1920, 1950, 1970, and 1980. These data were originally collected for climate modelers so they could reduce the uncertainty associated with the magnitude and time course of historical land use change and of carbon release. For this data base, South and Southeast Asia is defined as encompassing nearly 8 × 106 km2 of the earth's land surface and includes the countries of India, Sri Lanka, Bangladesh, Myanmar (Burma), Thailand, Laos, Kampuchea (Cambodia), Vietnam, Malaysia, Brunei, Singapore, Indonesia, and the Philippines. The most important change in land use over this 100-year period was the conversion of 107 × 106 ha of forest/woodland to categories with lower biomass. Land thus transformed accounted for 13.5% of the total area of the study region. The estimated total carbon content of live vegetation in South and Southeast Asia has dropped progressively, from 59 × 109 Mg in 1880 to 27 × 109 Mg in 1980. Throughout the study period, the carbon stock in forests was greater than the carbon content in all other categories combined, although its share of the total declined progressively from 81% in 1880 to 73% in 1980. The data base was developed in Lotus 1-2-3TM by using a sequential bookkeeping model. The source data were obtained at the local and regional level for each country from official agricultural and economic statistics (e.g., the United Nations Food and Agriculture Organization); historical geographic and demographic texts, reports, and articles; and any other available source. Because of boundary changes through time and disparities between the validity, availability, and scale of the data for each country, the data were aggregated into 94 ecological zones. The resulting data base contains land use and carbon information for 94 ecological zones and national totals for 13 countries. The directory to which the above link leads provides 90 Lotus 1-2-3TM files, three ARC/INFOTM export files, and five ASCII data files. We advise users to use the file transfer protocol (FTP) to download the binary spreadsheet *.wk1 files; please consult the ndp046.txt documentation file or Accessing CDIAC via FTP for instructions. In addition to these, a descriptive file that explains the contents and format of each data file and four FORTRAN and SAS TM retrieval programs for use with the ASCII data files are included. For access to the data files, click this link to the CDIAC data transition website: http://cdiac.ess-dive.lbl.gov/ndps/ndp046.html

本数据库包含1880年、1920年、1950年、1970年及1980年南亚与东南亚地区的土地利用变化估算数据，以及该区域植被碳含量数据。本数据集最初为气候建模人员采集，旨在降低历史土地利用变化及碳释放的规模与时间进程相关的不确定性。
本数据库界定的南亚与东南亚区域涵盖地球陆地表面近8×10^6 平方千米，包含印度、斯里兰卡、孟加拉国、缅甸（原称Burma）、泰国、老挝、柬埔寨（原称Kampuchea）、越南、马来西亚、文莱、新加坡、印度尼西亚及菲律宾。在这100年时段内，最显著的土地利用变化为107×10^6 公顷的森林/林地被转化为生物量更低的土地利用类型，经此转化的土地占研究区域总面积的13.5%。
南亚与东南亚地区活体植被的总碳储量估算值呈持续下降趋势，从1880年的59×10^9 兆克（Mg）降至1980年的27×10^9 兆克（Mg）。在整个研究时段内，森林碳储量始终高于其他所有土地利用类型的碳含量总和，但其占总碳储量的比例从1880年的81%持续下降至1980年的73%。
本数据库基于序贯簿记模型，在Lotus 1-2-3™软件中开发完成。源数据从各国地方及区域层面采集，来源包括官方农业与经济统计数据（如联合国粮食及农业组织）、历史地理与人口文本、报告及文章，以及其他可获取的资料。由于各国边界随时间发生变化，且各国数据的有效性、可得性与尺度存在差异，本数据集被整合为94个生态区。最终生成的数据库包含94个生态区的土地利用与碳信息，以及13个国家的全国汇总数据。
上述链接指向的目录包含90个Lotus 1-2-3™文件、3个ARC/INFO™导出文件，以及5个ASCII数据文件。我们建议用户使用文件传输协议（FTP）下载二进制电子表格*.wk1文件；具体操作说明请参阅ndp046.txt文档文件，或查阅《通过FTP访问CDIAC》相关指南。除此以外，该目录还包含一份说明各数据文件内容与格式的描述性文件，以及4个用于处理ASCII数据文件的FORTRAN和SAS™检索程序。
如需获取数据文件，请点击以下链接跳转至CDIAC数据转换网站：http://cdiac.ess-dive.lbl.gov/ndps/ndp046.html