摘 要：小麦叶面积指数是评价其长势和预测产量的重要农学参数, 多光谱遥感能够实现快速无损地监测叶面积指数。本文以中国淮安市为研究区域，以宁麦13、扬辐麦4号以及淮麦20为试验材料，设四个不同的氮水平，0、8、15、22kg N/667m2。采用GreenSeeker测得了归一化植被指数，用CGMD302测得了归一化植被指数、比值植被指数和正交植被指数，研究了小麦叶面积指数与植被指数的关系。结果显示，随着施氮量的增高，叶面积指数呈增高趋势；同时归一化植被指数、比值植被指数和正交植被指数也呈增高趋势。小麦叶面积指数、归一化植被指数、比值植被指数和正交植被指数随着小麦采样时期都是呈现先增长再下降的趋势。构建了小麦叶面积指数的反演模型，发现GreenSeeker测得的归一化植被指数对叶面积指数的的拟合度最好，能够满足实际应用的需要。67606

毕业论文关键词：小麦，叶面积指数，多光谱无损监测，植被指数

Abstract：Wheat leaf area index is important to evaluate agronomic parameters and predict its growing production, multispectral remote sensing could rapidly and non-destructive monitor the leaf area index. In this paper, China Huai'an City as the study area, Ningmai 13, Yang Fumai 4, Huaimai 20wheat as test materials, setting four different nitrogen levels, 0,8,15,22kg N / 667m2. Adopting GreenSeeker had normalized different vegetation index, use CGMD302 had normalized difference vegetation index, orthogonal ratio vegetation index and quadrature vegetation index, we studied the relationship between wheat leaf area index and vegetation index. The results show that as the amount of nitrogen increased, the leaf area index showed a trend of increase; at the same time, the normalized difference vegetation index, the ratio vegetation index and orthogonal vegetation index also showed a trend of increase. Wheat leaf area index , ratio of normalized difference vegetation index and vegetation index and orthogonal vegetation index as the sampling period is presented first of wheat growth to decline again. Build the inversion model of wheat leaf area index, found GreenSeeker measured the normalized difference vegetation index of leaf area index of the fitting is best,could satisfy the need of practical application.

Keywords：wheat ,leaf area index , multi-spectral noninvasive, vegetation index

目    录

1 前言 4

2 材料与方法 5

2.1 田间试验方案 5

2.2 实验方法 6

2.2.1 基于数码图像的叶面积测量方法 6

2.2.2 LI-3000C便携式叶面积仪 6

2.2.3 LAI的计算 7

2.2.4 光谱数据采集 7

3 结果分析 8

3.1 图像法叶面积的测量精度研究 8

3.2  LAI随氮肥处理和小麦不同采样时期的变化 8

3.2.1 不同施氮量对LAI的影响 8

3.2.2 LAI随小麦不同采样时期的变化 9

3.3 GreenSeeker测得数据随氮肥处理和小麦不同采样时期的变化 10

3.3.1 不同施氮量对NDVI的影响 10

3.3.2 NDVI随着小麦不同采样时的变化 11

3.4 CGMD所测得数据与小麦不同采样时期的变化