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| 北京市植被净生产力遥感测量与分析 | |
| 引用本文： | 宋国宝,潘耀忠,张树深,朱文泉.北京市植被净生产力遥感测量与分析[J].资源科学,2009,31(9):1568-1572. |
| 作者姓名： | 宋国宝 潘耀忠 张树深 朱文泉 |
| 作者单位： | 1. 北京师范大学地表过程与资源生态国家重点实验室,北京,100875;大连理工大学环境与生命学院工业生态与环境工程教育部重点实验室,大连,116024 2. 北京师范大学地表过程与资源生态国家重点实验室,北京,100875 3. 大连理工大学环境与生命学院工业生态与环境工程教育部重点实验室,大连,116024 |
| 摘 要： | 北京地区城市化进程迅速.自然植被萎缩和生产力下降是城市化进程的重要特征.本文基于光能利用率模型对北京范围内的植被净初级生产力(Net Primary Productivity,NPP)进行模拟,并分析植被净生产力模拟结果的季节性变化和空间格局.结论如下:①2007年北京市植被净生产力模拟总量为7.62×106tC,植被NPP在空间上分布非常不均匀,主城区是全市巨大的绿色消费区NPP模拟结果较低,不均匀的NPP状况在空间形成一系列等值线,其中生产力为4200tC的等值线基本与全市山体高程线平行,这反映出全市NPP空间分布具有明显的地貌分异特征;②一年内植被NPP在4月、5月份增加最快,7月、8月份达到最大,在全部土地利用类型中,耕地类型由于作物的播种、收割以及灌溉等耕作过程使其植被NPP的季节性变化不同于其他土地利用类型;③在区域尺度上,林地对植被净生产力的贡献率最高占70.17%,耕地占13.73%,然而在六环内林地对NPP的贡献率下降至27.85%,耕地对NPP贡献率增加至27.48%;从1996年～2006年,六环范围内的耕地面积从1100.07km2减少到484.13km2,耕地的减少导致主城区植被净生产力总量减少近1/3.对于北京地区来说,耕地对区域植被生产力累计具有重要作用,在城市建设中应加强耕地资源保护,以提高区域植被水平. |
| 关 键 词： | 空间分析 季节变化 土地利用 北京市 |
Measurement and Analysis for the Net Primary Productivity from Remote Sensing in Beijing City |
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| SONG Guobao,PAN Yaozhong,ZHANG Shushen and ZHU Wenquan.Measurement and Analysis for the Net Primary Productivity from Remote Sensing in Beijing City[J].Resources Science,2009,31(9):1568-1572. | |
| Authors: | SONG Guobao PAN Yaozhong ZHANG Shushen and ZHU Wenquan |
| Abstract: | Over the past few decades, Beijing City in China has experienced an obvious land use change which can be characterized by urbanization and vegetation shrinking. As a result, a high spatial heterogeneity of vegetation distribution has been shown obviously over this city and a large area for green vegetation consumption has been formed progressively in the central part of Beijing. In the present work, the authors performed a net primary productivity (NPP) simulation based on a light use efficiency model by using multi-temporal vegetation observation data, land use data, meteorological data and vegetation type data in the year 2007. Subsequently, the NPP simulation results were further analyzed by Geographic Information System (GIS)-based software in order to examine vegetation seasonal variations and its spatial patterns. It is concluded that first, the total amount of NPP in 2007 was about 7.62 million ton carbon (tC), showing a spatial heterogeneity over the study area. A series of NPP contour lines were extracted. The NPP contour line of 4200tC was generally in parallel with the mountainous couture line, showing distinct geomorphologic characteristics. Second, the NPP increased at the fastest rate in April and May in the study year and peaked in June and July when both temperatures and precipitation were favorably contributing to the rapid growth and development of vegetation and crops. Regarding the NPP for different land use types, there seems to be a seasonal difference in NPP distribution between cropland and other land use types resulting from human cultivated activities in different seasons, such as sowing, harvesting and irrigation. Third, forest contributed around 70% NPP to the accumulated NPP amount over the study area, the largest contribution compared to that of other land use types. Within the sixth ring road in Beijing, the NPP amount contributed by forest, by contrast, decreased to 27.85% while the NPP of cropland that is one of important land use types over this area increased to 27.48%. However, the area of cropland within the central region of Beijing City decreased from 1100.07 km2 to 484.13 km2 during the period 1996-2006, resulted from a vegetation accumulation shrinking. About one third mount of NPP has decreased due to the decrease in the area of cropland. Cropland not only has a function of traditional agricultural production but also has an ecological service function. Effective steps should therefore be taken immediately to protect cropland in metropolitan areas formed in urbanization and to improve regional vegetation conditions. |
| Keywords: | NPP |
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