Responses of Soil Organic Carbon Distribution Characteristics to Altitude in Picea crassifolia Forest in the Middle Qilian Mountains
Understanding the distribution characteristics of soil organic carbon and soil organic carbon densi-ty at different altitudes and soil layers in Picea crassifolia plantation in the Qilian Mountains is of great significance for maintaining carbon balance in the alpine mountains.In July 2021,soil samples of different layers were collected from the plots of Picea crassifolia plantations at the altitudes of 2 700,2 900,3 100,and 3 300 m in the study area.The soil samples were subject to different measurements,such as soil volume weight,soil organic carbon density.The differences of soil organic carbon(SOC)and soil organic carbon density(SOCD)between different soil layers at different altitudes were analyzed by Kruskal-Wallis ANOVA and one-way ANOVA.Adonis multivariate variance was used to analyze the effects of altitude on SOC and SOCD.The results showed that the SOC decreased with the increase of soil layer at all altitudes,while the SOCD showed no obvious trend with the increase of soil layer.The average range of SOC in this region was 127.63-62.17 g/kg,and the SOCD was 5.53-4.28 kg/m2.There was no difference between SOC and SOCD except for the altitude of 2900 m,and there were significant differences between surface soil and deep soil in the rest of the altitudes.With the change of altitude,the difference of SOC in different soil layers was concentrated in the 10 cm soil layer,while the difference in SOCD was concentrated in the 10 cm and 20 cm soil layers.Altitude had a significant effect on the difference of SOC formation in each soil layer,and only significantly affected the difference in the formation of SOCD in the 10 and 20 cm soil layers.The distribution characteristics of SOC are more sensitive to changes in altitude than soil organic carbon density.
Qilian Mountainssoil depthaltitude gradientsoil organic carbonsoil organic carbon density
万方数据
维普
