Impacts of urbanization on net primary productivity in the Pearl River Delta, China
Impacts of urbanization on net primary productivity in the Pearl River Delta, China
复制标题
城市化对中国珠江三角洲净初级生产力的影响
DOI：
10.22069/ijpp.2015.2464
复制
发表时间：
2015-10
影响因子：
2.5
通讯作者：
Q. Yu
中科院分区：
文献类型：
--
作者：
C. Jiang;Z.F. Wu;J. Cheng;Q. Yu
中国珠江三角洲地区的快速城市化导致了土地利用/土地覆盖的巨大变化。作为城市化过程中土地开发的主要原因，城市扩展主要发生在NPP较高的土地上，对区域生态系统产生了重大影响。本研究的主要目的是揭示城市扩展对区域净初级生产力的影响。利用土地覆被数据集和三类城市土地（城市、城市周边和非城市），对2000 - 2010年珠江三角洲的城市扩展进行了定量分析。以土地覆盖类型、植被指数（NDVI）和气候数据为驱动因子，采用CASA模型计算了研究区的NPP，分析了其时空变化特征以及城市扩展对NPP的影响。结果表明：NPP值较高的农田和森林以及湿地是城市扩张的主要来源，城市扩张通常会降低区域NPP值，主要是通过用城市土地取代植被。2000 - 2005年和2005 - 2010年，退耕还林分别减少了0.103TgC和0.034TgC，其中农田和林地的NPP损失占NPP损失的比例最大。在空间分布上，发生在城市和城郊的NPP损失分别占89.63%和75.04%，这主要是由于快速城市化过程中，大量生产力高的植被被不透水面所取代。这些结果为了解和评价城市生态系统变化提供了一个指标。
Great changes in land use/land cover from rapid urbanization have occurred in the Pearl River Delta, China. As the primary cause of land development in the urbanization process, urban expansion has mostly occurred on land with higher NPP, significantly impacting the regional ecosystems. The primary purpose of this study was to reveal the impacts of urban expansion on the regional NPP. The land cover datasets and three types of urban lands (urban, peri-urban and non-urban areas) were obtained to quantify the urban expansion of the Pearl River Delta from 2000 to 2010. The Carnegie-Ames-Stanford-Approach (CASA) model was driven by the land cover types, NDVI data and climate data to calculate the NPP for the study area and analyze its spatial-temporal variations, as well as the impacts on NPP from urban expansion. The results showed: cropland and forest with higher NPP values and wetland were the major source of urban expansion, which generally reduced the regional NPP values, primarily by replacing vegetation with urban land. The conversion of land to urban use resulted in a reduction of 0.103TgC from 2000 to 2005 and 0.034TgC from 2005 to 2010, cropland and forest accounted for the largest proportion of the total NPP losses. In spatial distribution, the NPP losses occurring in urban and peri-urban areas accounted for 89.63% and 75.04%, respectively, which was primarily a result of the massive vegetation with high productivity being replaced with impervious surfaces during the rapid urbanization process. These results provided an indicator to understand and evaluate ecosystem changes in urban regions.
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DOI：
10.1016/j.jag.2011.12.012
发表时间：
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发表时间：
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