Spatio-Temporal Variations and Driving Factors of Sand Fixation and Windbreaks in the Horqin Grassland Ecological Zone
The Horqin Grassland Ecological Function Zone belongs to the National Key Ecological Function Zone for sand fixation and windbreak.Analyzing the spatio-temporal changes and driving factors of its sand fixation and windbreak functions is of great significance for ensuring the ecological environment security of the Beijing-Tianjin-Hebei region and the rest of the country.This study evaluated the spatio-temporal changes of sand fixation and windbreak functions in the Horqin Grassland Ecological Function Zone from 2000 to 2020 based on the RWEQ model.At the same time,the method of partial derivatives was used to assess the impacts of climate change and human activities on the changes of the sand fixation and windbreak functions.The results show that:(1)From 2000 to 2020,the volume of sand fixation and windbreak function in the Horqin Grassland Ecological Function Zone showed a significantly upward trend overall(P＜0.05),with an average annual increase of 3.71×108 t.The lowest value occurred in 2001,while the highest was reached in 2018,at 4.32×108 t,representing a 39.35%increase compared to 2001.(2)From a spatial perspective,the high-value areas for sand fixation and windbreak function were mainly concentrated in the central and southern parts of the study area,while low values were mainly distributed in the northern part.The area with an increasing trend in sand fixation accounts for approximately 74.23%of the total study area,while the area with a decreasing trend accounts for 25.76%,particularly in areas like Balin Right Banner.(3)From 2000 to 2020,climate change significantly influenced the volume of sand fixation and windbreak function,with areas showing an increase in sand fixation accounting for 49.08%.The area where the volume of sand fixation and windbreak increased due to human activities accounted for 24.37%,particularly in the northern part of Jarud Banner and surrounding regions.The study highlights that climate change has a significant impact on sand fixation and windbreak functions.Further in-depth research is needed to explore the mechanisms through which climate change affects these functions,and scientific measures aimed at enhancing ecosystem resilience to climate change.
sand fixation and windbreak functionclimate changedriving factorscontribution analysiskey ecological function zones
万方数据
维普
