草业学报 ›› 2022, Vol. 31 ›› Issue (3): 1-15.DOI: 10.11686/cyxb2020573
• 研究论文 •
沈洁1(), 丁蕾1, 辛晓平1(), 张翔1,2, 徐大伟1, 侯路路1, 闫瑞瑞1
收稿日期:
2020-12-23
修回日期:
2021-03-01
出版日期:
2022-03-20
发布日期:
2022-01-15
通讯作者:
辛晓平
作者简介:
Corresponding author. E-mail: xinxiaoping@caas.cn基金资助:
Jie SHEN1(), Lei DING1, Xiao-ping XIN1(), Xiang ZHANG1,2, Da-wei XU1, Lu-lu HOU1, Rui-rui YAN1
Received:
2020-12-23
Revised:
2021-03-01
Online:
2022-03-20
Published:
2022-01-15
Contact:
Xiao-ping XIN
摘要:
放牧活动不但影响草原生态过程,而且改变草原群落空间格局。为进行草地冠层连续变化的尺度对放牧强度响应的研究,基于无人机机载激光雷达和多光谱遥感获取亚米级的草原冠层数据,利用小波分析方法研究了不同放牧强度下草原冠层空间格局及其尺度特征,探究草原冠层高度(CH)、植被覆盖度(FVC)、归一化植被指数(NDVI)等不同冠层参数空间尺度特征对放牧强度的响应。结果表明:CH、FVC、NDVI的小波方差随放牧强度增大呈下降趋势,草原冠层空间结构整体趋于均匀;小波方差和系数实部分析显示,CH,FVC和NDVI的空间格局存在170~180 m、116~140 m等2个主特征尺度,不随放牧强度而变化,较为稳定;中度、重度放牧使植物群落在空间中产生了许多小斑块,植被盖度的空间格局在小尺度上的变化较大。
沈洁, 丁蕾, 辛晓平, 张翔, 徐大伟, 侯路路, 闫瑞瑞. 基于无人机激光雷达与多光谱数据的不同放牧强度下草原冠层尺度特征研究[J]. 草业学报, 2022, 31(3): 1-15.
Jie SHEN, Lei DING, Xiao-ping XIN, Xiang ZHANG, Da-wei XU, Lu-lu HOU, Rui-rui YAN. Canopy scale characteristics of grassland under different grazing intensities based on UAV lidar and multispectral data[J]. Acta Prataculturae Sinica, 2022, 31(3): 1-15.
植被参数 Vegetation parameter | 数据产品 Data product | 分辨率 Resolution (m) | 获取时间Time (年-月-日 Year-month-day) |
---|---|---|---|
CH | HS-600无人机激光扫描系统CH产品 CH products of HS-600 UAV laser scanning system | 0.2 | 2018-09-11 |
FVC | HS-600无人机激光扫描系统FVC产品 Fractional vegetation cover products of HS-600 UAV laser scanning system | 0.2 | 2018-09-11 |
NDVI | 搭载MicaSense Red Edge-MX传感器Sense Fly无人机多光谱影像 Multispectral image of Sense Fly UAV with MicaSense Red Edge-MX sensor | 0.1 | 2018-09-11 |
表1 研究数据来源
Table 1 Research data sources
植被参数 Vegetation parameter | 数据产品 Data product | 分辨率 Resolution (m) | 获取时间Time (年-月-日 Year-month-day) |
---|---|---|---|
CH | HS-600无人机激光扫描系统CH产品 CH products of HS-600 UAV laser scanning system | 0.2 | 2018-09-11 |
FVC | HS-600无人机激光扫描系统FVC产品 Fractional vegetation cover products of HS-600 UAV laser scanning system | 0.2 | 2018-09-11 |
NDVI | 搭载MicaSense Red Edge-MX传感器Sense Fly无人机多光谱影像 Multispectral image of Sense Fly UAV with MicaSense Red Edge-MX sensor | 0.1 | 2018-09-11 |
植被参数 Vegetation parameter | 项目 Item | 放牧强度 Grazing intensity | |||
---|---|---|---|---|---|
GI0 | GI1 | GI3 | GI5 | ||
CH (cm) | 均值Mean | 10.6136 | 6.6287 | 4.4974 | 2.4724 |
标准差Standard deviation | 4.9968 | 3.5149 | 2.5772 | 1.0140 | |
FVC (%) | 均值Mean | 78.6755 | 76.2432 | 72.1455 | 61.7160 |
标准差Standard deviation | 0.8188 | 3.6008 | 4.7962 | 5.7201 | |
NDVI | 均值Mean | 0.5731 | 0.5617 | 0.5699 | 0.5184 |
标准差Standard deviation | 0.5040 | 0.3990 | 0.3700 | 0.4460 |
表2 CH、FVC、NDVI在不同放牧强度下的均值与标准差
Table 2 Mean and standard deviation of CH, FVC and NDVI under different grazing intensities
植被参数 Vegetation parameter | 项目 Item | 放牧强度 Grazing intensity | |||
---|---|---|---|---|---|
GI0 | GI1 | GI3 | GI5 | ||
CH (cm) | 均值Mean | 10.6136 | 6.6287 | 4.4974 | 2.4724 |
标准差Standard deviation | 4.9968 | 3.5149 | 2.5772 | 1.0140 | |
FVC (%) | 均值Mean | 78.6755 | 76.2432 | 72.1455 | 61.7160 |
标准差Standard deviation | 0.8188 | 3.6008 | 4.7962 | 5.7201 | |
NDVI | 均值Mean | 0.5731 | 0.5617 | 0.5699 | 0.5184 |
标准差Standard deviation | 0.5040 | 0.3990 | 0.3700 | 0.4460 |
图10 3个尺度范围下不同放牧梯度的草地冠层高度、植被覆盖度和归一化植被指数的小波方差
Fig.10 Wavelet variance of grassland canopy height (CH), fractional vegetation coverage (FVC) and normalized difference vegetation index (NDVI) under different grazing intensities in the three scales
图11 FVC和NDVI在不同放牧强度下第一主特征尺度均值与其对应的小波方差均值
Fig.11 Mean values of the the first principal characteristic scale and the wavelet variance corresponding to the first principal characteristic scale under different grazing intensities of FVC and NDVI
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