摘要
不同生育期水稻(Oriza sativa L.)冠层光谱反射率随着营养条件的变化而发生波动,掌握其变化规律,对快速诊断水稻养分亏缺,指导水稻施肥具有重要意义.以水稻合美占和粤晶丝苗2号品种为试验材料,以0.027、0.018、0.009和0 kg/m^24个施氮水平进行田间小区试验,对不同关键生育期水稻冠层光谱反射率的变化规律进行了研究.结果表明:水稻抽穗前,冠层的比值植被指数(Ratio vegetation index,RVI)(810,720)逐渐增大,到孕穗期达到最大值;水稻抽穗后,冠层的RVI(810,720)值逐渐减小,至收获期降至最低值.水稻RVI(810,720)与氮肥水平正相关,品种间无显著差异.随着生育进程推进,差值环境植被指数(Difference vegetation index,DVI)(810,720)逐渐增加,在齐穗期达到最高,而后逐渐降低,不同氮肥水平DVI(810,720)值差异显著,且DVI(810,720)值与施氮水平正相关.从总体上看,分蘖期的归一化植被指数(Normalized Difference Vegetation Index,NDVI)(810,720)稍高于拔节期、孕穗期、开花期和乳熟期,而拔节期、孕穗期、开花期和乳熟期的NDVI(810,720)值无显著差异,收获期达到最大值,水稻NDVI(810,720)值与氮肥水平呈负相关,品种间无显著差异.
Canopy spectral reflectance of rice（ Orizae sativa L.） at different growth stages changes with nutritional conditions. To know the changes is of great significance for the rapid diagnosis of rice nutrient deficiency,and fertilizer application. A plot experiment was conducted using two rice varieties Hemeizhan（ HMZ） and Yeujingsimiao2（ YJSM2） as test material,and at four nitrogen levels（ 0. 027,0. 018,0. 009 and 0. 000 kg / m^2） to study changes of canopy spectral reflectance of rice（ Oryza sativa L.） at different growth stages. The result showed that the ratio vegetation index（ RVI）（ 810,720） value before heading increased gradually,and up to the maximum at booting stage; while the RVI（ 810,720） value after heading decreased gradually to the minimum at harvest period. The RVI（ 810,720）values was positively correlated with nitrogen levels but there was no significant difference between varieties. The environment difference vegetation index（ DVI）（ 810,720） values increased with growth,and the peak was at heading period,then gradually decreased. The DVI（ 810,720） values were significantly different among different nitrogen levels,and were positively correlated with nitrogen levels. Overall,the NDVI（ 810,720） value at the tillering stage was slightly higher than those at other stages,while there had no significant differences among jointing,booting,flowering,and milk stages,and thehighest value was at harvest stage. NDVI（ 810,720） values were negatively correlated with nitrogen levels and there was no significant difference between varieties.
出处
《仲恺农业工程学院学报》
CAS
2015年第4期26-31,共6页
Journal of Zhongkai University of Agriculture and Engineering
基金
广东省科技计划(2012B020317002)
公益性行业(农业)科研专项(201303109-4)
校级大学生创新训练(2014B10)资助项目
