中国农业大学学报2025，Vol.30Issue(3)：71-84,14.DOI:10.11841/j.issn.1007-4333.2025.03.07
高温下减氮对水稻化学计量特征和非结构性碳水化合物分配的影响
Effect of nitrogen reduction under high temperature on the stoichiometric characteristics and non-structural carbohydrate allocation in rice
摘要
Abstract
The study aimed to investigate the effects of reducing the application of chemical fertilizers and organic fertilizers on the chemical stoichiometry and non-structural carbohydrate allocation of rice under high temperature stress during the earing stage.In the experiment,three temperature treatments were set during the heading period of rice:normal temperature(NT),moderate high temperature(2 ℃ higher than normal temperature,MT),and extremely high temperature(5 ℃ higher than normal temperature,HT).Meanwhile,four fertilization methods were studied,which were full fertilization of chemical fertilizer(CF),full fertilization of organic fertilizer(OF),reducing application by 20％compared to CF(-20％CF)and reducing application by 20％compared to OF(-20％OF).The effects of the interaction between temperature and fertilization method on the stoichiometric characteristics of nitrogen,phosphorus,and kalium in various organs of rice,as well as the allocation of non-structural carbohydrate(NSC)were analyzed.The results showed that the interaction effect between fertilization method and temperature treatment had a highly significant impact(P＜0.01)on the stoichiometric characteristics and NSC mass fraction of rice.Under moderate high temperature condition,compared with CF,OF treatment increased the nitrogen mass fraction of rice stems,leaves,and grains.-20％OF treatment increased the kalium mass fraction in leaves and stems,and also increased the K∶P ratio of stems,leaves,and grains-20％CF treatment increased the phosphorus mass fraction of stems and grains,as well as the NSC mass fraction of mature grains.Under extreme high temperature conditions,the N∶P ratio of rice stems,leaves,and grains is less than 14.Compared with CF,-20％CF,and OF treatments,the N∶P ratio of rice stems,leaves,and grains is the highest in-20％OF treatment,indicating that-20％OF treatment can alleviate the N limitation faced by rice nutrient absorption process.At the same time,under extremely high temperature condition,-20％CF reduces the N∶K ratio of stems,leaves,and grains compared to CF.Relevant analysis shows that N∶K in the grain,K∶P in the stem,and NSC transport rate in the stem sheath are significantly positively correlated with yield.In summary,under extremely high temperatures,moderate application of organic fertilizer can alleviate nitrogen limitation in rice,and facilitate NSC transport and actual yield;Under moderate high temperatures,moderate application of organic fertilizer and reduced application of chemical nitrogen fertilizer are beneficial for optimizing the stoichiometric characteristic values of stems,leaves,and grains and increasing the NSC mass fraction of grains.关键词
高温胁迫/化学计量特征/非结构性碳水化合物/源库关系Key words
high temperature stress/stoichiometric characteristics/non-structural carbohydrate/source-sink relationship分类
农业科学引用本文复制引用
俞施龙,张明静,王光华,赵金标,陈远杰,陈宇琪,黄丽芬..高温下减氮对水稻化学计量特征和非结构性碳水化合物分配的影响[J].中国农业大学学报,2025,30(3):71-84,14.基金项目
江苏省碳达峰碳中和科技创新专项(BE2022425) （BE2022425）
2024年江苏省研究生科研与实践创新计划项目(MX120230751) （MX120230751）
