河西走廊中段荒漠绿洲土壤生态化学计量特征  

Soil Stoichiometry Characterization in the Oasis-desert Transition Zone of Linze,Zhangye

作　　者：孙雪 龙永丽 刘乐 刘继亮 金丽琼[3] 杜海峰 陈凌云[1] SUN Xue;LONG Yong-li;LIU Le;LIU Ji-liang;JIN Li-qiong;DU Hai-feng;CHEN Ling-yun(Laboratory of Microbiota,College of Life Science,Northwest Normal University,Lanzhou 730070,China;Linze Inland River Basin Research Station,Northwest Institute of Ecological and Environmental Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Gansu Provincial Analysis and Testing Center,Lanzhou 730000,China;The Longnan Environmental Monitoring Station of Gansu Province,Longnan 746000,China)

机构地区：[1]西北师范大学生命科学学院,微型生物学研究室,兰州730070 [2]中国科学院西北生态环境资源研究所临泽内陆河流域研究站,兰州730000 [3]甘肃省分析测试中心,兰州730000 [4]甘肃省陇南生态环境监测中心,陇南746000

出　　处：《环境科学》2023年第6期3353-3363,共11页Environmental Science

基　　金：国家自然科学基金项目(42067012);甘肃省自然科学基金项目(20JR5RA532);甘肃省重点研发计划项目(21YF5WA012);甘肃省陇南市科技计划项目(2021-03);环境化学与生态毒理学国家重点实验室开放基金项目(KF2021-02);甘肃省教育厅优秀研究生“创新之星”项目(2021CXZX-335);西北师范大学研究生科研项目(2021KYZZ02129)。

摘　　要：为探究荒漠绿洲土壤C、N、P和K的含量变化及生态化学计量特征,阐明其对环境因子的生态学响应,选择河西走廊中段张掖临泽荒漠绿洲10块样地,采集表层土壤样品,测定土壤C、N、P和K含量,揭示不同生境中土壤养分含量变化和化学计量比的分布特征以及与其他环境因子间的相关关系.结果表明:(1)土壤C在各样点分布不均匀且具有明显的异质性(R=0.761,P=0.06).其中,ω(C)在绿洲平均值最高,为12.85 g·kg^(-1),过渡带次之,为8.65 g·kg^(-1),荒漠最低,为4.1 g·kg^(-1);(2)土壤K含量除在盐碱地含量较低外,在荒漠、过渡带和绿洲之间均无显著变化且含量较高;(3)土壤C∶N平均值为12.92,C∶P平均值为11.69,N∶P平均值为0.9,均低于全球土壤平均水平(13.33、72.0、5.9)和中国土壤平均水平(12、52.7、3.9);(4)土壤含水量为影响荒漠绿洲土壤C、N、P、K和生态化学计量特征的最大影响因子,贡献率为86.9%,其次为土壤酸碱度和土壤孔隙度,贡献率分别为9.2%和3.9%.研究结果为荒漠和绿洲生态系统的恢复和保护提供基础资料,也为后期研究该地区生物多样性维持机制及其与环境间的相关关系提供科学依据.To investigate the changes in C,N,P,and K contents and ecological stoichiometry of desert oasis soils and to elucidate their ecological responses to environmental factors,10 sample plots were selected in the Zhangye Linze desert oasis in the middle part of the Hexi Corridor,and surface soil samples were collected to determine the C,N,P and K contents of soils and to reveal the distribution characteristics of soil nutrient contents and stoichiometric ratios in different habitats and the correlation with other environmental factors.The results showed that:(1)the distribution of soil carbon was uneven and heterogeneous across sites(R=0.761,P=0.06).The highest mean value was 12.85 g·kg^(-1)in the oasis,followed by 8.65 g·kg^(-1)in the transition zone and 4.1 g·kg^(-1)in the desert.(2)The content of total soil potassium did not vary significantly and was high among deserts,transition zones,and oases and low in saline areas.(3)The mean soil C∶N value was 12.92,the mean C∶P value was 11.69,and the mean N∶P value was 0.9,all of which were lower than the global average soil content(13.33,72.0,and 5.9)and the Chinese soil average(12,52.7,and 3.9).(4)Soil water content was the most influential factor affecting C,N,P,K,and ecological stoichiometry characteristics of desert oasis soils,with a contribution of 86.9%,followed by soil pH and soil porosity,with contributions of 9.2% and 3.9%,respectively.The results of this study provide basic information for the restoration and conservation of desert and oasis ecosystems and establish a basis for future study of the biodiversity maintenance mechanism in the region and its correlation with the environment.

关 键 词：张掖临泽 荒漠绿洲 荒漠过渡带 生态化学计量 空间异质性 

分 类 号：X171[环境科学与工程—环境科学]