摘要
在夏玉米的不同生长阶段,测定冠层光谱,结合农学参数 LTN、CHL.C、CHL.D、LAI ,研究了农学参数的光谱响应规律及其与冠层光谱参量 反射率R、一阶微分光谱R′和红边位置REP 的相关性,并建立预测数学模型,结果表明,拔节-抽雄期,伴随着植株生长和群体壮大,红边斜率缓慢增加,红边位置呈逐渐偏向长波方向的 红移 ,至抽雄期群体稳定后而停止;开花-乳熟期,随着个体衰老和群体减弱,红边斜率减小,红边位置又呈偏向短波方向的 蓝移 .利用一阶微分光谱和红边位置推算夏玉米冠层CHL.D不仅是可行的,而且反演精度较高,最适模型分别为指数 R2=0.9487 和抛物线 R2=0.9392 .
The experimentation analyzed the spectral variation of agronomy parameters(LTN,CHL.C,CHL.D,LAI) and canopy hyperspectral data of the difference growth duration, researched the correlations and estabilished statistical models between the hyperspectral data(R,R′and REP)and agronomy parameters. The results indicated: Red edge slope slowly increased,and REP moved to the long wave band side from jointing stage to tasseling stage along with plant growing and colony granding,which was called 'red transference',and then it stopped in tasseling stage after the population was stable.The change was contrary from anthesis to milking stage,which was called 'blue transference'.It was not only feasible to estimate CHL.D by using the first derivative spectrum and REP, but also had higher precision,and the properest models were index(R^2=0.9487)and parabola (R^2=0.9392) respectively.
出处
《西北植物学报》
CAS
CSCD
2004年第6期1041-1046,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家863项目 (2003AA209040)
国家973项目 (G2000779)
国家自然科学基金项目 (30030090) 资助
关键词
高光谱数据
叶片全氮
叶绿素
叶面积指数
夏玉米
Hyperspectral data
leaf total nitrogen
chlorophyll content
leaf area index
summer maize
