岩性和种植年限对火龙果地土壤碳、氮、磷生态化学计量特征的影响  

Effects of lithology and planting years on ecological stoichiometry characteristics of soil carbon,nitrogen and phosphorus in Hylocereus undulatus Britt land

作　　者：易芬 邓艳[1] 洪涛[1] 谢运球[1] 吴松 柯静 YI Fen;DENG Yan;HONG Tao;XIE Yunqiu;WU Song;KE Jing(Guangxi Key Laboratory of Karst Dynamics/Key Laboratory of Karst Ecosystem and Rocky Desertification Control,Ministry of Natural Resources,Institute of Karst Geology,Chinese Academy of Geological Sciences,Guilin,Guangxi,541004;China University of Geosciences(Wuhan),Wuhan,430074;College of Environmental Science and Engineering,Guilin University of Technology,Guilin,Guangxi,541006)

机构地区：[1]中国地质科学院岩溶地质研究所,广西岩溶动力学重点实验室/自然资源部岩溶生态系统与石漠化治理重点实验室,广西桂林541004 [2]中国地质大学(武汉),武汉430074 [3]桂林理工大学环境科学与工程学院,广西桂林541006

出　　处：《地质论评》2022年第6期2219-2232,共14页Geological Review

基　　金：广西重点研发计划项目(编号:桂科AB19110004);广西重点基金项目(编号:2022GXNSFDA035067)的成果。

摘　　要：以石漠化问题突出区域——广西平果县太平镇耶圩火龙果种植园不同岩性背景(白云岩、碎屑岩)和不同种植年限(1、3、5a)土壤为研究对象,采用相关性分析和冗余分析方法探讨了不同岩性背景和火龙果种植年限下土壤碳、氮、磷生态化学计量特征及其影响因素。结果表明:(1)白云岩区土壤全磷含量显著高于碎屑岩区,而土壤有机碳含量、生态化学计量比(C/N、C/P和N/P)显著低于碎屑岩区;且白云岩和碎屑岩背景下的生态化学计量比(5.96、11.78、1.96和8.71、19.78、2.28)均远低于全国水平。(2)随着火龙果种植年限的增加,土壤有机碳、全氮含量和C/N、C/P、N/P呈现出逐渐增加的趋势,而土壤有效氮、全磷和有效磷含量无显著变化规律。随着土层深度增加,土壤有机碳、全氮、有效氮含量和C/N、C/P、N/P均增加,而土壤全磷含量无明显变化规律。(3)土壤C/N和C/P与有机碳、有效氮均呈显著正相关(P<0.01),而与土壤水分、容重呈显著负相关,土壤N/P与全磷呈显著负相关。(4)冗余分析表明不同岩性背景和火龙果种植年限下土壤有效氮含量是土壤碳、氮、磷及其生态化学计量比的重要影响因子,且呈显著正相关关系(P<0.01)。白云岩背景下火龙果的生长受到氮元素的影响更大,长期火龙果种植有利于碳、氮元素固存,土壤有效氮含量是影响土壤碳、氮、磷及其生态化学计量比的关键因子。Objectives:Soil carbon,nitrogen and phosphorus ecologic measurement ratio reflects the content of limiting elements in soil,which can provide theoretical basis for land balance management and plant growth.The effects of lithology and planting years on the ecological stoichiometry of soil carbon,nitrogen and phosphorus is still not clear.Methods:In this study,we collected soil from different lithological background(dolostone,clastic rock)and fixed number of year(1,3,5 a)in Yexu Hylocereus undulatus Britt Plantation,Taiping Town,Pingguo County,Guangxi.Correlation analysis and redundancy analysis were employed to discuss the ecological stoichiometric characteristics of carbon,nitrogen and phosphorus in 0~80 cm soil under different lithologic backgrounds and planting years.Results:The results show that:(1)The total phosphorus content in dolostone area was significantly higher than that in clastic rock area,while the soil organic carbon content,C/N,C/P and N/P in dolostone area were significantly lower than that in clastic rock area.The ecological stoichiometric ratios(5.96,11.78,1.96 and 8.71,19.78,2.28)in dolostone and clastic rock backgrounds are far lower than the national level.(2)The contents of soil organic carbon,total nitrogen and C/N,C/P,N/P increased with increasing of planting years,while the contents of soil available nitrogen,total phosphorus and available phosphorus had no significant change.Soil organic carbon,total nitrogen,available nitrogen and C/N,C/P,N/P increased as the soil get deep,while soil total phosphorus content had no obvious change pattern.(3)Soil C/N and C/P were positively correlated with soil organic carbon and available nitrogen(P<0.01),but negatively correlated with soil moisture and bulk density,and soil N/P was negatively correlated with total phosphorus.(4)Redundancy analysis showed that soil available nitrogen content was an important factor influencing soil C,N,P and its ecological stoichiometric ratio under different lithologic background and planting years,which showed a sign

关 键 词：岩性 火龙果种植年限 土壤碳氮磷 生态化学计量特征 冗余分析 

分 类 号：S153.6[农业科学—土壤学] S667.9[农业科学—农业基础科学]