东北林区固碳能力时空分异特征及其气候驱动研究OA

[Objective]This study aimed to systematically elucidate the spatiotemporal evolution patterns of carbon sequestration capacity,its topographic differentiation,and the contributions of climatic drivers in the Northeast Forest Region of China.[Methods]Using meteorological and remote sensing data,with net ecosystem productivity(NEP)as the core indicator,we integrated spatial clustering,partial correlation analysis,and multiple correlation analysis and incorporated topographic factors,including terrain relief,elevation,and slope.[Results]1)The annual mean NEP across the forest region was 301.2 g·m⁻2.A total of 92.2%of the forest area showed an increasing trend in carbon sequestration capacity,although considerable interannual variability was observed.Specifically,58.2%of the area exhibited low stability.Carbon sequestration capacity showed a decreasing latitudinal gradient,characterized by a"high in the southeast and low in the northwest"pattern.2)Significant spatial autocorrelation was detected,with high-value clusters(40.3%)and low-value clusters(41.3%)forming a distinct"high in the east,low in the west"spatial pattern.3)Topography exerted significant regulatory effects.Carbon sequestration capacity,stability,and the proportion of high-value cluster areas all increased with increasing terrain relief and slope,but decreased with elevation.Moreover,the rate of change in carbon sequestration exhibited a unimodal response to gradients of terrain relief and elevation,initially increasing and then decreasing.4)Climatic factors influenced carbon sequestration across 42.6%of the forest area.Precipitation was the most widespread climate driver(18.0%),mainly affecting eastern Inner Mongolia and southeastern Heilongjiang.The influence of climatic drivers strengthened with increasing terrain complexity,including greater relief,higher elevation,and steeper slopes.[Conclusion]Carbon sequestration capacity in the Northeast Forest Region shows a distinct decreasing latitudinal gradient and strong spatial clustering.Topography plays a significant regulatory role,precipitation is the primary climatic driver,and climatic influences are amplified under more complex terrain conditions.These findings provide a scientific basis for accurately assessing forest carbon sinks and implementing differentiated ecological management in regions with complex topography.