淋溶过程对亚高山针叶林土壤碳、氮海拔分布特征的影响  

Effects of leaching process on characteristics of altitudinal distribution of soil carbon and nitrogen in subalpine coniferous forest

作　　者：何晓丽 吴艳宏[2] 周俊[2] 马婷婷 HE Xiaoli;WU Yanhong;ZHOU Jun;MA Tingting(College of Resource,Environment and Tourism,Hubei University of Arts and Science,Xiangyang 441053,China;Chengdu Institute of Mountain Hazards and Environment,Chinese Academy of Sciences/Ministry of Water Resources,Chengdu 610041,China)

机构地区：[1]湖北文理学院资源环境与旅游学院,襄阳441053 [2]中国科学院水利部成都山地灾害与环境研究所,成都610041

出　　处：《华中农业大学学报》2021年第1期187-194,共8页Journal of Huazhong Agricultural University

基　　金：国家自然科学基金项目(41630751,41877011);湖北省高等学校优秀中青年科技创新团队计划项目(T2020016);湖北文理学院学科开放基金项目(XK2020063)。

摘　　要：为揭示淋溶过程在山地养分循环中的重要作用,研究了贡嘎山东坡海拔2600~3200 m针叶林土壤碳(C)、氮(N)的海拔分布特征,分析了不同海拔4个样点的针叶林土壤C、N含量及碳氮比(C/N),并结合其他土壤物理、化学和生物指标探讨了淋溶过程对土壤C、N海拔分布特征的影响。结果显示:分解强烈的凋落物层(O H层)的C、N含量和碳氮比(C/N)随海拔升高有降低趋势。由于凋落物碳(C lit)含量分别与O H层C、N含量显著正相关(P<0.05),因此,O H层C、N海拔分布特征主要由C lit输入量控制。与O H层相比,矿质土层(A、B和C层)中C、N含量及C/N并未发现明显的梯度变化趋势。A层C、N含量在2781 m样点较低,而B和C层C、N含量均在2781 m样点最高。天然降雨中C、N含量明显低于壤中流中C、N含量,展现了淋溶作用对C、N空间分布的影响。上述结果表明,淋溶过程对西南亚高山针叶林土壤C、N空间分布格局具有不可忽略的影响。In order to reveal the importance of leaching on mountainous nutrients cycling,the characteristics of altitude distribution of soil C and N in the coniferous forest at an altitude of 2600-3200 m on the eastern slope of the Gongga mountain were studied.The soil C,N content and C/N of the conifers at 4 sampling points at different altitudes were analyzed.Combined with other soil physical,chemical and biological indicators,the effects of the leaching process on the characteristics of altitudinal distribution of soil C and N were explored.The results showed that the spatial distributions of C,N contents and C/N in the humified litter horizon(O H horizon)exhibited a similar decreasing trend with the increase of altitude.Since the content of C in litters(C lit)was positively correlated with soil C and N in the O H horizon(P<0.05),the production of C lit was the main factor affecting the altitudinal distributions of soil C and N in the O H horizon.The obvious altitudinal trend was not observed for soil C,N contents and C/N in the mineral horizons(A,B and C horizon).The contents of soil C and N in the A horizon were lower than those in the 2781 m site,while the maximums were for the B and C horizon in this site.The contents of soil C and N in the rainfall were significantly lower than those in the interflow,which showed the effects of leaching on the spatial distributions of soil C and N.It is indicated that the effects of leaching process on the spatial distributions of soil C and N in subalpine coniferous forest in Southwest Asia can not be ignored.

关 键 词：碳、氮海拔分布特征 淋溶过程 针叶林土壤 亚高山 山地养分循环 C、N生物地球化学循环 

分 类 号：P593[天文地球—地球化学] S153.6[天文地球—地质学]