黑河中游荒漠绿洲过渡带典型固沙植物根区土壤C、N、P化学计量特征  

Characteristics of soil C,N and P stoichiometry in the root zone of typical sand-fixing plants in the desert oasis transition zone of the middle reaches of the Heihe River

作　　者：刘鹏 胡广录[1,2] 陶虎 周成乾 LIU Peng;HU Guangu;TAO Hu;ZHOU Chengqian(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Yellow River Water Environment in Gansu Province,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]甘肃省黄河水环境重点实验室,甘肃兰州730070

出　　处：《甘肃农业大学学报》2024年第6期175-185,共11页Journal of Gansu Agricultural University

基　　金：国家自然科学基金项目(41561102,41867074);甘肃省水利厅水资源费预算项目(甘水建管发〔2019〕255号)。

摘　　要：【目的】土壤C、N、P化学计量特征可表征土壤养分供应能力和储量变化,是反映土壤养分循环及其肥力水平的关键指标。固沙植物以灌木和半灌木为主,在抑制荒漠化和维持绿洲生态安全方面扮演着重要的角色。分析固沙植物根区的土壤C、N、P化学计量特征,探究其养分含量变化规律,可为维持荒漠绿洲过渡带的稳定性和今后的防风固沙工程实践提供科学方案和必要参考。【方法】以黑河中游荒漠绿洲过渡带3种典型固沙植物梭梭、泡泡刺和沙拐枣为研究对象,测定固沙植物根区不同土层深度土壤中的有机碳(SOC)、全氮(STN)和全磷(STP)指标,分析3种固沙植物根区土壤C、N、P化学计量特征及影响因素。【结果】3种典型固沙植物根区SOC含量均在60~80cm土层出现峰值,STN、STP含量的峰值均出现在表层土壤;SOC含量随土层深度的增加先增大后减小,STN和STP随土层深度的增大而减小;在研究区特定的环境条件下,植物类型对土壤C、N、P含量及其化学计量特征有显著影响,梭梭根区的土壤养分含量较其他两种植物更高;3种典型固沙植物根区各理化性质指标之间的相关系数总体表现为梭梭>泡泡刺>沙拐枣。【结论】黑河中游荒漠绿洲过渡带梭梭、泡泡刺和沙拐枣根区土壤C、N、P含量具有显著差异(P<0.05),梭梭的保肥能力及其环境适应性较其他两种植物更强。【Objective】The stoichiometric properties of soil C,N and P characterise changes in soil nu-trient supply and storage capacity and are key indicators of soil nutrient cycling and balance.Sand-fixing plants,mainly shrubs and semi-shrubs,play an important role in controlling desertification and maintaining the ecological security of oases.Analyzing the stoichiometric characteristics of soil C,N and P in the root zone of sand-fixing plants and exploring their nutrient variation patterns can provide scientific solutions and necessary references for maintaining the stability of the desert-oasis transition zone and for future engineer-ing practices to control wind and sand.【Method】Soil organic carbon(SOC),soil total nitrogen(STP)and soil total phosphorus(STP)were measured and analyzed in soil samples from July to September 2021 at dif-ferent soil depths in the root zone of three typical sand-fixing plants in the transition zone of the middle reaches of the Heihe River desert oasis to study the stoichiometric characteristics and influencing factors of soil C,N and P in the root zone of the three sand-fixing plants.【Result】The SOC content in the root zone of the three typical sand-fixing plants peaked in the 60~80 cm soil layer,and the peaks of STN and STP content were all in the top soil layer;the SOC content increased and then decreased with increasing soil depth,and STN and STP decreased with increasing soil depth.Under the specific environmental conditions of the study area,plant type had a significant effect on soil C,N and P contents and their stoichiometric char-acteristics,with the root zone of Haloxylon ammodendron having a higher soil nutrient content than the other two plants.The correlation coefficients between the indicators of the root zone of the three typical sand-fixing plants were generally H.ammodendron>Nitraria sphaerocarpa>Calligonum mongolicum.【Conclusion】There are significant differences in the C,N and P contents of soils in the root zones of H.am-modendron,N.sphaerocarpa and C.mongo

关 键 词：荒漠绿洲过渡带 固沙植物 C、N、P含量 土壤保肥能力 

分 类 号：S153.1[农业科学—土壤学]