Ecological Resilience of Picea schrenkiana along Altitude Gradients in the Western Section of the Northern Slope of Tianshan Mountains,China
Based on the data of basal area increment of Picea schrenkiana that collected at intervals of 100 m altitude gradients in the Wenquan-Haxia forest area of the western section of the northern slope of the Tianshan Mountains,the changes in ecological resilience of trees in this region were analyzed.Drought events are the most significant disturbance factor for regional ecological resilience,while high temperature events are also one of the disturbance factors.The intensity of these disturbance factors leads to changes in the characteristics of ecological resilience gradients.In extreme drought years,the gradient growth resilience characteristics of the Haxia area are most pronounced,with strong resistance and weak recovery at mid-to-high altitudes,and the opposite trend at low altitudes,accompanied by growth decline.During moderate drought events,all altitudes exhibit strong resistance and relatively strong recovery.In high temperature years,low altitudes show weak resistance and recovery.When drought events persist in the Haxia forest area,tree growth is suppressed at all altitudes,but the decline intensity is greater at low altitudes than at high altitudes.Trees at high altitudes have stronger drought adaptation ability than those at mid-to-low altitudes.
Picea schrenkiananorth slope of Tianshan MountainsTree-ringelevation gradientecological elasticity