| 摘要: |
| 为构建基于结构参数与光谱特征的荒漠灌木地上生物量 (Above-ground biomass, AGB) 估算
模型, 研究以西鄂尔多斯国家级自然保护区 3 种典型荒漠灌木为对象, 通过耦合冠层形态参数与多光谱遥
感数据, 建立 AGB 反演模型, 进而可评估荒漠生态系统健康状况。 基于拍照法获取灌木株高、 冠幅和地
径等结构参数, 并衍生计算灌木面积和体积参数。 利用植被指数, 建立灌木结构参数、 植被指数与地上
生物量的定量关系模型。 结果表明, (1) 实际测量与拍照法测量值具有高度一致性 (R
2
>0. 9)。 (2) 灌
木体积参数与地上生物量呈极显著正相关关系 (皮尔逊相关系数 R
2 = 0. 65 ~ 0. 86, P<0. 001), 其中椭圆
柱体 V4 模型与四合木 Tetraena mongolica 地上生物量呈现显著相关性 (R
2 = 0. 64, P<0. 01), 而植被指数
与地上生物量相关性不显著 (R
2
<0. 49); (3) 体积模型 V5 (半椭球体+椭圆台组合) 对生长形态各异的
灌木具有最佳普适性 (R
2 = 0. 80 ~ 0. 86), 其中四合木与圆柱体 V1 (R
2 = 0. 87)、 沙冬青 Ammopiptanthus
mongolicus 与椭圆柱体 V2 (R
2 = 0. 85) 和霸王 Sarcozygium xanthoxylon 与 V5 (R
2 = 0. 91) 模型精度最高
(均 P<0. 01)。 该几何建模方法通过解析植物形态的三维空间分布特征, 显著提升了干旱区形状多样的灌
木生物量估算的精度与可靠性。 |
| 关键词: 荒漠灌木 地上生物量 拍照测量法 西鄂尔多斯 |
| DOI： |
| 分类号: |
| 基金项目:中国水利水电科学研究院基本科研业务费项目 ( MK0199A122021), 内蒙古自治区防沙治沙科技创新重大示范工程 (2024JBGS0013)。 |
|
| Study on Estimation Model of Aboveground Biomass of Desert Shrub in West Ordos |
|
namahan1, lijinrong2, caoyuxuan1, shenyanfei1, qupengcheng1
|
|
1.Agricultural University of Inner Mongolia;2.Institute of Pastoral Water Resources, China Institute of Water Resources and Hydropower Research
|
| Abstract: |
| To construct estimation models for desert shrub above-ground biomass (AGB) based on structural parameters and spectral characteristics, this study targeted three typical desert shrubs in the West Ordos National Nature Reserve. By coupling canopy morphological parameters with multispectral remote sensing data, AGB inversion models were established to assess desert ecosystem health. Structural parameters including shrub
height, crown width, and ground diameter were acquired via the photography method, from which shrub area
and volume parameters were derived. Using vegetation indices, quantitative relationship models between shrub
structural parameters, vegetation indices, and AGB were developed. The results showed that: (1) There was
a high degree of consistency between the actually measured values and the values measured by the photography
method (R
2
>0. 9). (2) The shrub volume parameter (V) showed an extremely significantly positive correlation with AGB (Pearson correlation coefficient R
2 = 0. 65-0. 86, P<0. 001). Specifically, the elliptic cylinder
model V4
showed a significant correlation with the AGB of Tetraena mongolica (R
2 = 0. 64, P<0. 01). However, the correlation between vegetation indices and AGB was not significant (R
2
<0. 49). (3) The volume
model V5 (a combination of a semi-ellipsoid and an elliptical frustum) had the best universality for shrubs with
diverse growth forms (R
2 = 0. 80-0. 86). Among them, the models of Tetraena mongolica-cylinder V1 (R
2 =
0. 87), Ammopiptanthus mongolicus-elliptic cylinder V2 (R
2 = 0. 85), and Sarcozygium xanthoxylon-V5 (R
2
= 0. 91) had the highest accuracy (all P<0. 01). This study confirms that the method based on three-dimensional geometric volume parameters can effectively estimate the AGB of desert shrubs, providing a reliable technical solution for the monitoring of ecosystems in arid regions. |
| Key words: desert shrub above-ground biomass photographic measurement method West Ordos |
