摘要
植被NPP时空分布特征不仅能在一定程度上反映出城市土地利用现状,而且还能影响城市生态系统服务价值。文中基于江西省赣州市2000—2015年NPP数据、DEM数据和土地利用变化数据,借助最小二乘法和GIS空间回归方法定量分析了研究区近16年植被NPP时空变化特征,并进一步揭示了地形因子(高程、坡度)和土地利用与植被NPP变化的相关性。研究表明:①赣州市NPP值空间分布特征明显,整体上呈现南高北低,西高东低,沿东南向西北逐渐增加的分布态势;②16年间赣州市年植被NPP年平均值整体呈现增加趋势,但城市主城区呈现负增长;③在不同地形因子条件下,赣州市植被NPP随海拔升高呈现“升高—稳定—降低”的特点,在海拔500~1000 m的区域NPP达到峰值,在0~70°坡度范围内,植被NPP呈现增长趋势;④土地利用变化是影响植被NPP的重要因数,2000—2015年赣州市林地转出251.08 km^(2),城乡建设用地转入130.07 km^(2),耕地和草地各转入49.14 km^(2)和93.15 km^(2),年均NPP增加了173.12 gC/(m^(2)·a),呈现出林地面积减少,植被密度有所增加。结果显示:2000—2015年间赣州市在城市发展和生态环境保护之间取得了较好的平衡点,全市碳循环系统状况总体好转。
The spatial and temporal distribution characteristics of vegetation NPP can not only reflect the current status of urban land use to a certain extent,but also affect the value of urban ecosystem services.Based on DEM data,land use change data,and NPP data of Ganzhou City from 2000—2015,using the Least Squares Method and GIS special regression method,this paper quantitatively analyzes the characteristics of the spatial and temporal changes of vegetation NPP in Ganzhou City,Jiangxi Province in the past 16 years,and reveals the correlation among the topographical factors(elevation,slope),land use change and vegetation NPP change.The research shows that:①The NPP value of Ganzhou has obvious spatial distribution characteristics.The overall NPP value is high in the south part of the city and low in the north,high in the west and low in the east.②The NPP value gradually increases along the southeast to the northwest areas.But the main urban area showed a negative growth;③Under different topographical factors,the vegetation NPP of Ganzhou showed the characteristics of“increasing-stabilizing-decreasing”as the altitude increased.The NPP peaked at an altitude of 500~1000 m;within the slope range of 0~70°,vegetation NPP shows an increasing trend.④Land use change is an important factor affecting vegetation NPP.From 2000 to 2015,251.01 km^(2) woodland was transferred in Ganzhou City,130.07 km^(2) was transferred to urban and rural construction land,and cultivated land and grassland were transferred in 49.14 km^(2) and 93.15 km^(2) respectively.The average annual NPP increased by 173.12 gC/(m^(2)·a),reflecting the decrease in the area of forest land in Ganzhou City,but the increase in vegetation density.The results show that Ganzhou City has achieved a good balance between urban development and ecosystem protection from 2000 to 2015,and the city’s carbon cycle system has improved overall.The research results can provide a reference for the protection and the comprehensive evaluation of Ganzhou’s ecosystem.
作者
徐锋良
刘昭华
陈斌
徐尚昭
周阳阳
XU Fengliang;LIN Zhaohua;CHEN Bin;XU Shangzhao;ZHOU Yangyang(School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Research Institute No.290,CNNC,Shaoguan 512000,Guangdong,China)
出处
《江西理工大学学报》
CAS
2021年第1期30-37,共8页
Journal of Jiangxi University of Science and Technology
基金
中国核工业二九〇研究所科研创新项目(202003)
广东省海洋遥感重点实验室(中国科学院南海海洋研究所)基金资助项目(2017B030301005-LORS2009)。
关键词
NPP
赣州市
时空变化
土地利用变化
生态系统
NPP
Ganzhou City
temporal and spatial changes
land use changes
ecosystem
