珠三角城市群区域生态系统服务供需均衡关系

生态系统服务供需均衡关系分析为生态系统管理提供了详实的科学基础信息。基于土地利用、气象和社会经济等多源数据，采用遥感反演、水量平衡方程、修正的通用土壤流失方程和植被净生产力模型(CASA)等方法，分别评估了1990—2015年珠三角城市群粮食供给、产水服务、固碳释氧和土壤保持服务；采用相关社会经济指标核算了生态系统服务的需求量；进而揭示了栅格、县域和市域多尺度的生态系统服务供需均衡关系及其时空演变特征。研究发现：(1)除粮食供给外，产水服务、固碳释氧和土壤保持服务呈波动性增加的趋势，增幅分别为52.2%、21.8%和73.4%;在空间上表现为中部平原地区服务水平低，低山丘陵地带高的分布特征。(2)除土壤保持服务外，粮食供给、产水服务和固碳释氧服务需求量不断增加，增幅分别为10.1%、17.5%和769.4%;中部平原地区生态系统服务需求量大，低山丘陵地带小。(3)除土壤保持和产水服务外，粮食供给、固碳释氧及综合服务供需指数不断下降，其中，2015年粮食供给和固碳释氧供需指数分别为-0.47和-0.71。研究结果可为决策者了解区域的生态系统服务供需均衡匹配状况提供科学基础信息，直接服务并...

The balance between ecosystem services supply and demand in the Pearl River Delta Urban Agglomerations area

The examination of the supply and demand for ecosystem services provides precise and fundamental scientific data for ecosystem management. Based on land use, remote sensing, meteorological and socio-economic data, we used the ecological process methods and models such as remote sensing retrieval, water balance equation, revised universal soil loss equation (RUSLE) and CASA to evaluate the grain supply (GS), water yield (WY), carbon sequestration and oxygen release (CS) and soil conservation (SC), and used the relevant socio-economic indicators to calculate the amount of key ecosystem services demand in the Pearl River Delta urban agglomerations from 1990 to 2015. We analyzed the balance between ecosystem services supply and demand at the grid, county and city levels. The results showed that:(1) Except for GS, the WY, CS and SC showed an increasing trend with fluctuation, increased about 52.2%, 21.8% and 73.4%, respectively. Ecosystem service supply was characterized by low levels in the central plain and high levels in the low mountain and hilly areas. (2) In addition to SC, the demand for GS, WY and CS had a trend of continuous increase, increased about 10.1%, 17.5% and 769.4%, respectively. The demand is high in the central plain areas and low in the low mountains and hills. (3) Except for SC and WY, the supply-demand index of the GS, CS and the integrated services declined at different level. In 2015, the supply-demand indices of GS and CS were -0.47 and -0.71, respectively. The study''s findings would provide basic scientific information for decision-makers to grasp the balance and matching conditions between ecosystem service supply and demand, which could directly serve and guide regional ecosystem management and planning, as well as promote the sustainable development of eco-socio-economic system.