摘要
为探究稻田退耕对土壤碳(C)、氮(N)、磷(P)生态化学计量特征的影响,本研究以黄河三角洲退耕2 a(TG2a)和退耕15 a(TG15a)土地为研究对象,以退耕前稻田(DT)、未开垦自然湿地(ZR)为对照组,对稻田退耕土壤碳、氮、磷及其生态化学计量特征进行研究,揭示关键作用因子。结果表明:不同土地类型土壤有机碳(TOC)、全氮(TN)和全磷(TP)含量均值变化在1.30~3.86、0.30~1.03 g·kg^(-1)和0.39~0.72 g·kg^(-1)之间;TG2a土壤碳、氮、磷含量较DT明显下降,而TG15a土壤较TG2a明显上升。相应土壤C∶N、C∶P和N∶P均值变化在4.31~5.81、8.23~17.56和1.56~4.10之间,稻田退耕后C∶N变化趋势因土壤层次而异,而C∶P和N∶P则整体升高。研究表明,溶解性有机碳和黏粒含量是影响退耕土壤TOC、TN、TP及其生态化学计量比变化的主要因子。
In order to explore the effects of returning paddy field on ecological stoichiometric characteristics of soil carbon(C),nitrogen(N)and phosphorus(P),returned paddy fields for 2 years(TG2a)and for 15 years(TG15a)were selected in the Yellow River Delta,and the paddy field(DT)and natural wetland(ZR)were selected as the controls,to study the ecological stoichiometric characteristics of soil carbon,nitrogen and phosphorus in paddy field,and also to reveal the key impacting factors.The results showed that the mean values of total organic carbon(TOC),total nitrogen(TN)and total phosphorus(TP)contents of different soils were 1.30-3.86,0.30-1.03 g·kg^(-1),and0.39-0.72 g·kg^(-1),respectively.A decreased was found for the contents of TOC,TN and TP in the TG2a soil compared to DT,while an increase was found in the TG15a soil compared to TG2a.The mean ratios of C∶N,C∶P and N∶P in soils were 4.31-5.81,8.23-17.56 and 1.56-4.10,and values of C∶N varied with soil layers and those of C∶P and N∶P increased overall in the returned paddy field.The study indicated that the contents of dissolved organic carbon and clay were the main factors affecting the changes in TOC,TN,TP and their ecological stoichiometric characteristics in soils as a response to returning paddy field to wetland.
作者
王琦璇
杨继松
卢国伟
孙丹丹
王志康
周迪
邵秋玲
WANG Qixuan;YANG Jisong;LU Guowei;SUN Dandan;WANG Zhikang;ZHOU Di;SHAO Qiuling(Institute for Advanced Study in Coastal Ecology,Ludong University,Yantai 264025,China;Dongying Academy of Agricultural Sciences,Dongying 257091,China)
出处
《农业环境科学学报》
北大核心
2025年第4期1046-1055,共10页
Journal of Agro-Environment Science
基金
国家自然科学基金项目(42271055)
“黄河三角洲学者”人才工程项目
山东省高等学校青创团队项目(2022KJ118)。
关键词
碳
氮
磷
生态化学计量特征
退耕还湿
稻田
黄河三角洲
carbon
nitrogen
phosphorus
ecological stoichiometric characteristics
returning to wetland
paddy field
the Yellow River Delta
