施氮量对覆膜旱作水稻产量形成和冠层光谱特性的影响  

Effect of Nitrogen Fertilization on Yield Formation and Spectral Indices in the Canopy of a“Ground Cover Rice Production System(GCRPS)”

作　　者：郭琳 王化宏 程道德 彭希[1] 胡克林[1] 左强[1] 林杉[1] GUO Lin;WANG Hua-hong;CHENG Dao-de;PENG Xi;HU Ke-lin;ZUO Qiang;LIN Shan(College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193,China;College of Agronomy,Jiangxi Agricultural University,Nanchang 330045,China;Bureau of Agriculture of Fang County,Shiyan City Hubei 442000,China)

机构地区：[1]中国农业大学资源与环境学院,北京100193 [2]江西农业大学农学院,南昌330045 [3]湖北省十堰市房县农业局,湖北十堰442000

出　　处：《西南大学学报（自然科学版）》2021年第1期67-74,共8页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金项目(41371286,51139006).

摘　　要：试验共设5个氮肥施用量(0,60,120,180,240 kg/hm^2),测定籽粒产量、产量构成因子、水稻冠层6种高光谱指数,并将高光谱指数与产量和产量构成因子进行回归分析.获得如下主要结果:①增加施氮量,显著提高了覆膜旱作水稻籽粒和秸秆产量;②覆膜旱作水稻的有效穗和穗粒数,随着施氮量增加呈增长趋势;③水稻冠层比值植被指数(RVI)与覆膜旱作水稻产量、产量构成因子以及氮肥利用效率呈显著正相关关系.In the“ground cover rice production system(GCRPS)”,all fertilizers have to be applied as basal fertilization before film mulching,which results in excessive vegetativegrowth and potential N deficiency during the reproductive stage.However,it remains unknown how nitrogen application rate affects rice growth and yield in GCRPSand whether canopy hyperspectral vegetation indices can accurately reflect the N nutrition status of film-mulched rice plants.In order to provide a rapid andefficient way for rice nitrogen diagnosis and optimization in GCRPS,a field experiment was conductedin which rice plants were supplied with nitrogen fertilizer at 0,60,120,180 and 240 kg/hm 2,andyield,yield-forming factorsand 6 canopy hyperspectral indices of rice were determined.Then,regression analysis was made of the hyperspectral indices with rice yield and yield-forming factors.The results showed that rice grain and straw yield increasedsignificantly with higher nitrogen application in GCRPS;thatproductive tillers and spikelets per panicle increased with higher nitrogen application;and the ratio vegetation index(RVI)of rice canopy was in a highly significant positive correlation with the yield,yield-contributing characters and nitrogen use efficiency of the plants.

关 键 词：水稻覆膜节水栽培体系 产量 产量构成因子 氮肥利用效率 高光谱 回归模型 

分 类 号：S511[农业科学—作物学]