稻纵卷叶螟为害下水稻分蘖期的光谱特征及生物量分析
毕业论文关键词：稻纵卷叶螟；为害程度；光谱特征；诊断模型；生物量
Spectral Characteristics and Biomass Analysis of Rice Damaged by Cnaphalocrocis medinalis at Tillering Stage
Abstract:【Objective】The purpose of this study was to analyze the effect of different degrees of damage on the spectral characteristics of rice leaf at the tillering stage. Starting with the spectral reflectance, finding out the sensitive bands which could represent the damage degree of Cnaphalocrocis medinalis and the SPAD and the LAI after Cnaphalocrocis medinalis damage, and getting the corresponding diagnostic models. Based of this study, we could provide theoretical indexes and methods for remote sensing monitoring of Cnaphalocrocis medinalis. At the same time to investigate the rule between the damage degree of Cnaphalocrocis medinalis and the rice biomass.【Method】Releasing different numbers of Cnaphalocrocis medinalis to experiment rice field plot and piding the plots into different damage degrees. The spectral reflectance, SPAD and LAI of rice leaves were measured by ASD spectrometer, SPAD instrument and plant canopy analyzer AccuPAR respectively, then recevied the sensitive bands. After rice harvest, measured the biomass of each rice plot by sampling randomly and investgated the relation between the damage degree of Cnaphalocrocis medinalis and the biomass of rice.【Result】 At the rice tillering stage, the band of the largest correlation coefficient between the reflectivity and the SPAD is 962nm, and the band of the largest correlation coefficient between the reflectivity and LAI is 710nm. The diagnosis model between the damage degree and the leaf damge level, SPAD, LAI respectively. These model are: y = -34.553x +56.554 (R² = 0.809), y = -34.553x +56.554 (R² = 0.809), y = -34.553x +56.554 (R² = 0.809), y = -34.553x +56.554 (R² = 0.809), y = = 0.458), y = -11.368x +3.377 (R² = 0.815), respectively.
Key words: Cnaphalocrocis medinalis; Damaged level; Spectral characteristics; Diagnosis model; Biomass
目 录
摘要1
关键词1
Abstract1
Key words1
引言1
1 材料与方法3
1.1 试验区田块、水稻、虫源的准备3
1.1.1 试验田及水稻选择3
1.1.2供试虫源4
1.1.3 罩笼设置4
1.1.4 试验设计4
1.1.5 接虫时间及测定方法4
1.2 光谱和生物量的测定 4
1.2.1 光谱的测定 4
1.2.2 叶绿素含量（SPAD）的测定5
1.2.3 叶面积指数的测定5
1.2.4 生物量的测定5
1.3 数据分析方法5