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作 者:何金松 吴小红[1] 王卫[2] 闫文德[1] HE Jinsong;WU Xiaohong;WANG Wei;YAN Wende(College of Life and Environmental Sciences,Central South University of Forestry&Technology,Changsha 410004,China;Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China)
机构地区:[1]中南林业科技大学生命与环境科学学院,长沙410004 [2]中国科学院亚热带农业生态研究所,长沙410125
出 处:《生态学杂志》2025年第3期920-929,共10页Chinese Journal of Ecology
基 金:湖南省“三尖”创新人才工程项目(2022RC1124);湖南省自然科学基金优秀青年基金项目(2020JJ3064);长沙市科技计划项目(kq2208244);水利部三峡后续工作项目(HY110161A0012022)资助。
摘 要:为探究水分管理对土壤生态化学计量比和水稻产量特征的影响,本研究以亚热带地区耕灌雨养、间歇灌溉和长期淹灌下的稻田土壤为对象,对早稻期和晚稻期的土壤养分、化学计量比、微生物群落和水稻产量进行了分析。结果表明:(1)间歇灌溉土壤可溶性有机碳(DOC)含量和DOC/速效磷(AP)最高。长期淹灌的土壤有机碳(SOC)、全氮(TN)、全磷(TP)和AP含量均低于耕灌雨养和间歇灌溉。(2)间歇灌溉土壤细菌Shannon(6.4)、Chao1指数(3549.9)和水稻产量(6727 kg·hm^(-2))在晚稻期显著高于耕灌雨养处理(P<0.05)。(3)水稻产量与土壤DOC、DOC/速效氮(AN)和DOC/AP呈显著正相关(P<0.05);土壤DOC、DOC/AN和DOC/AP与土壤细菌Alpha多样性、土壤梭菌目(Clostridiales)和根瘤菌目(Rhizobiales)相对丰度呈正相关。(4)结构方程模型表明,土壤细菌Alpha多样性、梭菌目和根瘤菌目等细菌相对丰度的提高,有利于土壤DOC含量的增加,进而提高了DOC/AN和DOC/AP,最终提高了水稻产量。综上,间歇灌溉提高了土壤细菌Alpha多样性、DOC含量、DOC/AN和DOC/AP,有利于水稻产量的增产。To clarify the effects of water management on soil ecological stoichiometric ratios and rice yield,we analyzed soil nutrients,stoichiometric ratios,microbial communities,and rice yield in paddy soils under flooding-rainfed(F-RF),flooding-midseason drying-flooding(F-D-F),and continuous flooding(CF)in a subtropical region,during the early and late rice seasons.The results showed that:(1)The highest soil dissolved organic carbon(DOC)content and DOC/available phosphorus(AP)were observed in the F-D-F.Soil organic carbon(SOC),total nitrogen(TN),total phosphorus(TP),and AP contents in the CF were lower than those in the F-RF and F-D-F.(2)Soil bacterial Shannon(6.4)and Chao1(3549.9)indices as well as rice yield(6727 kg·hm^(-2))were significantly higher(P<0.05)in the F-D-F than in the FRF during the late rice season.(3)Rice yield was positively correlated with soil DOC,DOC/available nitrogen(AN)and DOC/AP(P<0.05).Soil DOC,DOC/AN,and DOC/AP were significantly correlated with bacterial alpha diversity and the relative abundances of Clostridiales and Rhizobiales.(4)Structural equation modeling indicated that increased soil bacterial alpha diversity and relative abundances of Clostridiales and Rhizobiales stimulated soil DOC accumulation,which in turn increased DOC/AN and DOC/AP and ultimately increased rice yield.In conclusion,the F-D-F treatment increased soil bacterial alpha diversity,DOC content,and DOC/AN,DOC/AP,and thus resulted in higher rice yield.
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