摘要
为探究不同施氮和施磷水平对农田土壤全量养分、速效养分含量及其生态化学计量的影响,分析土壤环境因子和碳、氮、磷含量与全量养分生态化学计量和速效养分生态化学计量相关关系,阐明不同施肥水平对农田土壤养分动态平衡的影响。以黄土高原春小麦农田土壤为研究对象,于2017年布设N、P添加试验,试验处理包括对照(CK)、低氮(LN)、中氮(MN)、高氮(HN)、低磷(LP)、中磷(MP)、高磷(HP)共7个处理。结果表明:(1)氮添加显著增加了土壤氨态氮(NH_(4)^(+)-N)、硝态氮(NO_(3)^(-)-N)含量,磷添加显著降低了土壤NH_(4)^(+)-N、NO_(3)^(-)-N含量(P<0.05);氮、磷养分添加对全氮(TN)含量均无显著影响(P>0.05)。(2)N添加显著增加了土壤C/N、C/P、N/P、C/AP、AN/AP,显著降低了土壤C/AN(P<0.05);P添加显著降低了土壤C/N、C/P、N/P、C/AP、AN/AP,显著增加了土壤C/AN(P<0.05)。(3)土壤C/N和C/AN呈显著负相关关系(P<0.05),C/P和C/AP、N/P和AN/AP呈显著正相关关系。综上,黄土高原地区农田土壤速效养分和速效生态化学计量能够更加灵敏地响应N、P养分添加。
To investigate the effects of different nitrogen and phosphorus levels on total nutrient content,available nutrient content and ecological stoichiometry in agricultural soils,the authors analyzed the relationships between soil environmental factors,carbon(C),nitrogen(N)and phosphorus(P)content,and the ecological stoichiometry of total and available nutrients to elucidate the impact of different fertilizer levels on the dynamic balance of soil nutrients in agricultural fields.We selected spring wheat farmland soils in Loess Plateau as our research subject and conducted N and P addition experiments in 2017.The experimental treatments included a control group(CK),low nitrogen(LN),medium nitrogen(MN),high nitrogen(HN),low phosphorus(LP),medium phosphorus(MP)and high phosphorus(HP),totaling seven treatments.The results showed that:(1)nitrogen addition significantly increased the content of ammonium nitrogen(NH_(4)^(+)-N)and nitrate nitrogen(NO_(3)^(-)-N)in the soil,while phosphorus addition significantly decreased the NH_(4)^(+)-N and NO_(3)^(-)-N content(P<0.05).The addition of nitrogen and phosphorus nutrients had no significant effect on total nitrogen(TN)content(P>0.05).(2)N addition significantly increased soil C/N,C/P,N/P,C/AP and AN/AP ratios,and significantly decreased soil C/AN ratio(P<0.05).P addition significantly decreased soil C/N,C/P,N/P,C/AP and AN/AP ratios,and increased soil C/AN ratio(P<0.05).(3)Soil C/N and C/AN showed a significant negative correlation(P<0.05),while C/P and C/AP,N/P and AN/AP showed a significant positive correlation.In conclusion,available nutrient content and available ecological stoichiometry in agricultural soils in loess plateau region are more sensitive to N and P nutrient additions.
作者
李志强
齐鹏
王雅芝
王晓娇
甘润
薛江龙
李国山
LI Zhiqiang;QI Peng;WANG Yazhi;WANG Xiaojiao;GAN Run;XUE Jianglong;LI Guoshan(College of Resources and Environmental Sciences,Gansu Agricultural University,Lanzhou 730070;Gansu Provincial Key Laboratory of Arid Land Crop Science,Gansu Agricultural University,Lanzhou 730070;Engineering Research Center for the Resource Utilization of Livestock and Poultry Wastes in Gansu Province,Lanzhou 730070;College of Management,Gansu Agricultural University,Lanzhou 730070;Wuwei Agricultural Technology Extension Center,Wuwei,Gansu 733000)
出处
《中国农学通报》
2024年第10期95-102,共8页
Chinese Agricultural Science Bulletin
基金
甘肃省高校创新基金项目“不同氮磷配施对陇中黄土高原旱作农田土壤磷形态的影响研究”(2020B-135)
甘肃农业大学青年导师扶持基金项目“磷添加对旱作农田温室气体排放的酶学机制”(GAU-QDFC-2021-20)
重点研发计划-农业领域“武威市沿沙灌区盐碱地土壤改良及耕地质量提升技术体系研究”(23YFNH0003)。
关键词
土壤养分
生态化学计量
黄土高原
主成分分析
soil nutrients
ecological stoichiometry
loess plateau
principal component analysis
