生态环境学报Issue(1)：50-57,8.
芦芽山土壤有机碳和全氮沿海拔梯度变化规律
Distribution characteristics of soil organic carbon and total nitrogen along elevation gradients in Luya Mountain
摘要
Abstract
Better understanding the distribution pattern of soil carbon storage (SOC) and total nitrogen (total N) along elevation gradients will facilitate the projection of global change on terrestrial C and N cycling. Soil organic carbon and total nitrogen contents in 0-0.1, 0.1-0.25 and 0.25-0.4 m soil layers were measured following the standard procedures for four vegetation communities:Subalpine meadow, cold temperate coniferous forest, coniferous and broad-leaved mixed forest and shrub grassland, along elevation gradients from 1 703.1 m to 2 756.3 m on the Luya Mountains in the eastern rim of the Loess Plateau in China. The results showed that the SOC and total N in the three layers were all positive linear correlated with elevation (P<0.001). The SOC of different layers are (35.71±13.32), (29.18±12.85) and (26.39±12.74) g· kg-1 respectively, and the total N contents are (2.83±0.93), (2.38±0.84) and (2.12±0.80) g· kg-1 respectively. Both are decreased with soil depth declined. The CN ratio varied from5 to 19 in study area. The highest value was observed in cold-temperate coniferous forest (2 332.6 m), but the lowest value in subalpine meadow (2 756.3 m). The CN ratio variation trend showed “Λ” with elevation gradients and which fitted with the Gaussian model. Elevation induced microclimatic differences and vegetation community types were found to be important factors for the significant variations in SOC and total N in the Luya Mountains.关键词
芦芽山/有机碳/全氮/C/N/海拔梯度Key words
Luya Mountain/soil organic carbon (SOC)/total nitrogen/C/N/elevation gradients分类
农业科技引用本文复制引用
武小钢,郭晋平,田旭平,杨秀云..芦芽山土壤有机碳和全氮沿海拔梯度变化规律[J].生态环境学报,2014,(1):50-57,8.基金项目
国家自然科学基金项目(30970480)；山西省自然科学基金项目(2010021027-4；2010021028-6)；山西农业大学博士科研启动项目；山西农业大学“学术骨干”项目 （30970480）
