稻田土壤碳氮磷含量及其生态化学计量特征对大气CO_(2)浓度升高和增温的响应  

Responses of the contents and stoichiometry of soil carbon,nitrogen,and phosphorus to elevated atmospheric CO_(2) concentration and warming in paddy field

作　　者：范亚冉 于冰冰 夏少攀 朱紫琪 范豫川 刘晓雨[1,2] 张旭辉 郑聚锋[1,2] FAN Yaran;YU Bingbing;XIA Shaopan;ZHU Ziqi;FAN Yuchuan;LIU Xiaoyu;ZHANG Xuhui;ZHENG Jufeng(Institute of Resource,Ecosystem and Environment of Agriculture,College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China;Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization,Nanjing 210095,China;Department of Soil,Water,and Ecosystem Sciences,University of Florida-IFAS,Gainesville 32603,Florida,USA)

机构地区：[1]南京农业大学资源与环境科学学院,农业资源与生态环境研究所,南京210095 [2]江苏省有机固体废弃物资源化协同创新中心,南京210095 [3]佛罗里达大学土壤、水和生态系统科学系,美国佛罗里达州盖恩斯维尔32603

出　　处：《应用生态学报》2024年第12期3409-3418,共10页Chinese Journal of Applied Ecology

基　　金：江苏省自然科学青年基金项目(BK20221028);国家自然科学青年基金项目(42303078)资助。

摘　　要：研究大气CO_(2)浓度升高和增温对稻田土壤有机碳(SOC)、总氮(TN)、总磷(TP)及其生态化学计量比的影响及机制,对理解气候变化下稻田生态系统功能具有重要意义。本研究以T-FACE气候变化平台为依托,共设置4个处理:正常环境条件(CK);CO_(2)浓度600μmol·mol^(-1);冠层升温2℃;CO_(2)浓度600μmol.mol^(-1)和冠层升温2℃,测定了SOC、TN、TP、土壤有机碳组分、土壤容重、土壤含水量和粒径组成,运用方差分析和Pearson相关性分析方法探究气候和土壤理化性质对SOC、TN、TP含量及其生态化学计量特征的影响机制。结果表明:与CK相比,大气CO_(2)浓度升高提高了SOC、TN和TP的积累量。增温导致SOC积累损失,促进了TN积累,对TP积累没有影响。大气CO_(2)浓度和气温协同增加对SOC、TN和TP的影响更接近单一增温的影响,表明增温对土壤碳氮磷的影响大于大气CO_(2)浓度升高。大气CO_(2)浓度升高和增温总体上导致0~100cm剖面土壤C/N、C/P和C/N/P值下降,说明气候变化不利于土壤有机碳的稳定性和埋藏潜力。SOC、TN、TP及生态化学计量比与碳组分、土壤含水量呈正相关,与土壤容重呈负相关,与粒径组成没有相关性。0~30cm土层土壤化学计量特征(SOC、TN和C/P)与CO_(2)浓度的关系较为密切,而30~100cm土层土壤化学计量特征(SOC、TP、C/N和C/P)与增温的关系较为密切,表明稻田表层和底层土壤化学计量特征对气候变化的响应机制不尽相同。To study the effects of elevated atmospheric CO_(2)concentration and warming on the contents and stoichiometry of soil organic carbon(SOC),total nitrogen(TN),total phosphorus(TP)in paddy field is of great significance for understanding the functions of paddy ecosystem under climate change.Based on the T-FACE platform,we conducted an experiment with four treatments:ambient conditions(CK);elevated atmospheric CO_(2)concentration up to 600μmol·mol-1;warming of canopy air by 2℃Cover ambient;elevated atmospheric CO_(2)concentration up to 600μmol·mol-1combined with warming of canopy air by 2℃Cover ambient.The contents of SOC,TN,TP,soil organic carbon composition,soil bulk density(BD),soil water content(SWC)and particle size composition were measured.Using variance analysis and Pearson correlation analysis,we explored the influencing mechanisms of climate change and soil physicochemical properties on the contents and stoichiometry of SOC,TN,and TP.The results showed that elevated atmospheric CO_(2)concentration increased the accumulation of SOC,TN,and TP.Warming caused the loss of SOC accumulation,promoted TN accumulation,with limited effect on TP accumulation.The effects of combined elevated atmospheric CO_(2)concentration and warming on SOC,TN,and TP were in line with the effects of single warming treatment,indicating that warming had greater impacts on SOC,TN and TP than elevated atmospheric CO_(2)concentration.Elevated atmospheric CO_(2)concentration and warming overall decreased soil C/N,C/P and C/N/P values in the O-100 cm layer,indicating that climate change was not conducive to the stability and burial potential of SOC.The contents and stoichiometry of SOC,TN,and TP were positively correlated with organic carbon components and soil water content,negatively correlated with bulk density,and not correlated with particle size composition.The relationships between soil stoichiometry characteristics(e.g.,SOC,TN,and C/P)in the O-30 cm layer and elevated atmospheric CO_(2)concentration were relatively close,whil

关 键 词：稻田 土壤剖面 碳氮磷 生态化学计量 大气CO_(2)浓度升高 增温 

分 类 号：S154.1[农业科学—土壤学]