摘要
利用连续3年不同灌水下限(25、35和45 kPa)和施氮量(75、300和525 kg N·hm^(-2))的膜下滴灌设施番茄田间试验,探讨水氮调控对设施土壤供氮潜力的影响。结果表明:灌水下限和施氮量对土壤有机碳和全氮储量的影响显著,而水氮交互作用对二者影响均不显著;灌水下限、施氮及其交互作用对休耕期0～30 cm设施土壤有机氮组分、微生物量氮和固定态铵储量的影响显著;不同水氮调控下,设施番茄休耕期0～30 cm土壤酸解氮组分储量及占酸解总氮比例的大小顺序依次为酸解氨基酸氮>酸解铵态氮>酸解未知氮>酸解氨基糖氮;酸解氨基酸氮是设施土壤中最主要的有机氮形态;酸解氨基酸氮与酸解铵态氮、酸解氨基糖氮、酸解总氮、非酸解氮、有机碳和全氮均呈显著相关;土壤固定态铵与酸解氨基酸氮呈显著正相关;土壤微生物量氮与酸解铵态氮、酸解氨基糖氮呈显著正相关,与酸解氨基酸氮呈显著负相关。土壤酸解氨基酸氮、土壤微生物量氮和固定态铵在一定程度上可作为设施土壤供氮潜力的反映指标,科学合理的水氮措施对提升设施土壤供氮潜力具有重要意义。
Soil organic carbon(SOC),total nitrogen(TN),fixed ammonium(FA),microbial biomass nitrogen(SMBN)and organic nitrogen fractions are important indicators of soil nitrogen supply potential.A three-year tomato field experiment with mulch-film drip irrigation was conducted to investigate the effects of lower irrigation limits(25,35,and 45 kPa)and nitrogen fertilization levels(75,300,and 525 kg·N·hm-2)on greenhouse soil N supply potential(including SOC,TN,FA,SMBN and soil organic nitrogen fraction storage).The results showed that the main effects of irrigation and nitrogen fertilization on the storage of SOC and TN were statistically significant,but that was not the case for their interactive effects.The main and interactive effects of irrigation and nitrogen fertilization on the storage of greenhouse soil organic nitrogen fractions,SMBN and FA at 0-30 cm soil layer were significant in the fallow period.Under different treatments of irrigation and nitrogen fertilization regulations,the proportions of acidolysable organic nitrogen fractions in greenhouse soil during the fallow period followed the order:acidolysable amino acid nitrogen(AAN)>acidolysable ammonium nitrogen(AN)>acidolysable unknown nitrogen(UN)>acidolysable amino sugar nitrogen(ASN).AAN was the major fraction of greenhouse soil organic nitrogen.AAN had a significant positive correlation with AN,ASN,acid hydrolyzed nitrogen(AHN),non-acidrolyzable nitrogen(NAN),SOC and TN.There was a significant positive correlation between FA and AAN.SMBN was positively correlated with ASN and AN,and negatively correlated with AAN.Therefore,AAN,SMBN and FA could be used as indicators for greenhouse soil nitrogen supply potential in a certain extent.Reasonable regulations of irrigation and nitrogen fertilization are conducive to improving greenhouse soil nitrogen supply potential.
作者
吴汉卿
李素捷
刘洋屹
张鑫蕊
赵奇隆
李梦思
邹洪涛
党秀丽
张玉玲
虞娜
WU Han-qing;LI Su-jie;LIU Yang-yi;ZHANG Xin-rui;ZHAO Qi-long;LI Meng-si;ZOU Hong-tao;DANG Xiu-li;ZHANG Yu-ling;YU Na(College of Land and Environment,Shenyang Agricultural University,Shenyang 110866,China;Key Laboratory of Arable Land Conservation(Northeast China),Ministry of Agriculture and Rural Affairs,Shenyang 110866,China;National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources,Shenyang 110866,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2019年第5期1410-1418,共9页
Chinese Journal of Ecology
基金
国家自然科学基金项目(41401322)
国家重点研发计划项目课题(2016YFD0300807)
国家科技支撑计划项目(2015BAD23B01)
沈阳农业大学大学生创新计划项目资助
关键词
水氮调控
设施土壤
供氮潜力
有机氮组分
微生物量氮
固定态铵
储量
irrigation and nitrogen fertilization regulation
greenhouse soil
nitrogen supply potential
organic nitrogen fraction
microbial biomass nitrogen
fixed ammonium
storage
