1 引 言
2 材料与方法
2.1 试验设计
2.2 基于无人机图像的群体株高获取
2.2.1 无人机图像获取
2.2.2 无人机图像处理
2.3 各小区群体株高人工测量方法
表1 获取株高数据时各播期所处生育时期Table 1 The growth period of each sowing date when the plant height was obtained |
播期 | 7月25日 | 8月27日 | ||||
---|---|---|---|---|---|---|
FK139 | JNK728 | ZD958 | FK139 | JNK728 | ZD958 | |
B1 | AS 41 d | AS 36 d | AS 34 d | AS 74 d | AS 69 d | AS67 d |
B2 | AS 31 d | AS 29 d | AS 26 d | AS 64 d | AS 62 d | AS59 d |
B3 | AS 21 d | AS 18 d | AS 16 d | AS 54 d | AS 51 d | AS49 d |
B4 | AS 10 d | AS 7 d | AS 5 d | AS 43 d | AS 40 d | AS38 d |
B5 | AS 5 d | AS 1 d | Silking | AS 38 d | AS 34 d | AS33 d |
B6 | V14 | V12 | V12 | AS 27 d | AS 24 d | AS22 d |
B7 | V7 | V8 | V7 | AS 17 d | AS 12 d | AS10 d |
B8 | V6 | V6 | V6 | AS 8 d | AS 4 d | AS2 d |
|
2.4 分析与统计方法
3 结果与分析
3.1 不同处理下群体株高差异及图像表现
表1 7月25日和8月27日两次监测时人工测定的各小区平均株高 单位: mTable 1 Average plant height of two treatments measured artificially on 25 July and 27 August |
播期 | 7月25日 | 8月27日 | ||||
---|---|---|---|---|---|---|
FK139 | JNK728 | ZD958 | FK139 | JNK728 | ZD958 | |
B1 | 2.3b | 2.5b | 2.1c | 2.3d | 2.5d | 2.1d |
B2 | 2.2c | 2.6a | 2.2c | 2.1e | 2.5d | 2.2cd |
B3 | 2.4a | 2.6a | 2.5b | 2.4bc | 2.6cd | 2.5b |
B4 | 2.5a | 2.7a | 2.4b | 2.5ab | 2.7bc | 2.5b |
B5 | 2.5a | 2.8a | 2.6a | 2.5a | 2.9a | 2.6a |
B6 | 1.9d | 2.0c | 1.7d | 2.4bc | 2.8ab | 2.5b |
B7 | 1.2e | 1.0d | 0.9e | 2.4c | 2.6cd | 2.2c |
B8 | 0.3f | 0.3e | 0.3f | 2.1e | 2.2e | 1.9e |
|
3.2 无人机影像监测群体高度与人工实测株高间的关系
3.3 影响图像监测高度的因素分析
表3 不同玉米品种归一化图像高度与人工实测株高特征参数Table 3 Normalized image height of different cultivars and characteristic parameters of artificially measured plant height |
测量日期 | 品种 | 相关系数 | |
---|---|---|---|
RGB图像 | 多光谱图 | ||
7月25日 | FK139 | 0.818* | 0.486 |
JNK728 | 0.954** | 0.774* | |
ZD958 | 0.945** | 0.737* | |
—— | 0.900** | 0.672** | |
8月27日 | FK139 | 0.478 | 0.306 |
JNK728 | 0.549 | 0.272 | |
ZD958 | 0.797* | 0.415 | |
—— | 0.604** | 0.332 |
|