On the Landscape Pattern Change and the Ecological Service Value Response: Taking Qianyang County as an Example

Taking Qianyang County in Shaanxi Province as the research area, this paper extracts remote sensing data from 2000 to 2015 and consults land use degree index,landscape index and mathematical model to analyze the change characteristics of landscape pattern. According to the evaluation model of ecosystem service value, the paper quantitatively analyzes the impact of the change of Qianyang County's landscape pattern on the ecological service value (ESV). The results show that from the year of 2000 to 2015, the farming area decreased year by year, and was transformed into grassland and woodland; the unused land was transferred to construction land and water conservancy land. The landscape connectivity and uniformity of the study area in the past 15 years improve and the overall ecosystem service value show an increasing trend of 4.40%. The individual ecosystem service value is mainly based on biodiversity protection, water conservation, and soil formation and protection, with soil protection and formation value accounting for 18.25% of the total. The 4 phases of land use are higher than the national average, and the land is fully utilized. The sensitivity analysis verifies the estimated results of the ESV coefficient. The results show that the change of landscape pattern in Qianyang County affects the value trend of ESV and the value of regional ecosystem services.