Luoshan is the most important ecological barrier and water conservation land in the central arid zone of Ningxia. To explore the impact of terrain factors on the ecosystem service value (ESV) of Luoshan grassland, we used the revised ecosystem service value equivalent to estimate ESV based on remote sensing images in 2021, and analyzed its spatial distribution characteristics and terrain gradient effects. The results showed that the total ESV of Luoshan grassland was 34.18×107 yuan, with desert steppe accounting for the highest proportion (50.7%). Among all the service types, the ESV of regulation service was the largest, which was 22.11×107 yuan. The ESV was higher in the south region and lower in the north region, higher in the west region and lower in the east region. There was a strong spatial dependence of ESV, forming a spatial pattern of two poles gathering. The ESV of grassland showed topographic differentiation, which decreased first and then increased with the increases of elevation. The ESV increased with slope and terrain index, with the lowest ESV on the north slope and the highest ESV on the northeast slope. The results can provide scientific basis for the optimization of ecosystem pattern and grassland management in Luoshan.
罗山是宁夏中部干旱带最重要的生态屏障和水源涵养地,为探究地形因素对罗山草地生态系统服务价值的影响,本研究基于2021年的遥感影像,采用修正后的生态系统服务价值当量,估算罗山草地生态系统服务价值(ESV)并分析其空间分布特征及地形梯度效应。结果表明: 2021年,罗山草地生态系统服务总价值为34.18×107元,其中,荒漠草原ESV占比最高,为50.7%;在各类生态系统服务中,调节服务的ESV最大,为22.11×107元。研究区草地ESV在空间上整体呈西高东低、南高北低的特点,形成两极聚集的空间格局。罗山草地ESV具有一定地形分异规律,表现为随海拔升高而先减后增;其与坡度和地形位指数呈线性增加的变异规律;在正北坡向最低,东北坡向最高。研究结果可为罗山草地生态系统格局优化和管控提供科学依据。.
Keywords: ecosystem service value; grassland ecosystem; spatial distribution; terrain gradient.