摘要
作为土壤活性有机碳主要组分之一的轻组分有机碳(LFOC),对高海拔和高纬度低温生态系统的土壤有机碳动态及稳定性具有重要意义。通过在西南亚高山—高山海拔梯度上(3 250,3 438,3 672,3 852,4 098m)对亚高山森林土壤均质化后进行原位培养,研究高寒土壤中轻组分有机碳在海拔梯度上的响应特征与季节变化趋势。结果表明:海拔升高及低温季节均有利于土壤LFOC积累,而生长季节是土壤LFOC的消耗时期;在同一采样时间的同一海拔高度上,表层(0—10cm)和表下层(10—20cm)土壤LFOC含量总体表现出随深度增加而降低的规律,其中在低温季节中后期的11月和3月均达到差异显著水平。
The soil light fraction organic carbon(LFOC)as one of the main components of soil labile organic carbon is of significance for dynamics and stability of the soil organic carbon in the cryogenic ecosystems of high altitude and high latitude area.Repacked columns of homogenized topsoil(0—20cm)were incubated along a altitudinal gradients(3 250 m,3 438 m,3 672 m,3 852 m,4 098m)in subalpine-alpine area of southwestern China.By analyzing response characteristics and trends of soil light fraction organic carbon(LFOC)the 0—10cm and 10—20cm depths in the elevation gradient,seasonal dynamics of soil light fraction organic carbon(LFOC)and its related biochemical processes under temperature gradient caused by different altitudes were revealed.The results showed that elevation and cold seasons are conducive to the accumulation of soil LFOC but the growing season is the consumption period of soil LFOC.All content of soil LFOC decreased with increase of depth in soil layer of 0—10cm and 10—20cm at the same elevation of the same sampling time,which presents the significant difference levels in November and March.
出处
《水土保持研究》
CSCD
北大核心
2015年第1期51-55,共5页
Research of Soil and Water Conservation
基金
国家自然科学基金(41271094
40871124)
中央高校基本科研业务费(2010SCU22007)
关键词
土壤轻组分有机碳
土壤活性有机碳
海拔梯度
低温季节
alpine cold soil
soil light fraction organic carbon
soil labile organic carbon
altitudinal gradients
cold season