img

官方微信

高级检索

中国沙漠 ›› 2026, Vol. 46 ›› Issue (2): 131-142.DOI: 10.7522/j.issn.1000-694X.2025.00127

• • 上一篇    

干旱半干旱区典型流域生物结皮分布遥感提取方法

宋志祺1(), 王晨沣2, 刘梦云1, 王小平1,3()   

  1. 1.西北农林科技大学,资源环境学院,陕西 杨凌 712100
    2.西北农林科技大学,水土保持科学与工程学院,陕西 杨凌 712100
    3.西北农林科技大学,农业农村部西北旱地农业绿色低碳重点实验室,陕西 杨凌 712100
  • 收稿日期:2024-11-27 修回日期:2025-05-27 出版日期:2026-03-20 发布日期:2026-04-13
  • 通讯作者: 王小平
  • 作者简介:宋志祺(2003—),男,湖北咸宁人,硕士研究生,主要从事定量遥感研究。E-mail: 2826935912@qq.com
  • 基金资助:
    国家重点研发计划项目(2022YFF1300801)

A remote sensing method for extracting bio-crust distribution from a typical watershed in arid and semi-arid areas

Zhiqi Song1(), Chenfeng Wang2, Mengyun Liu1, Xiaoping Wang1,3()   

  1. 1.College of Natural Resources and Environment /, Northwest A&F University,Yangling 712100,Shaanxi,China
    2.College of Soil and Water Conservation Science and Engineering /, Northwest A&F University,Yangling 712100,Shaanxi,China
    3.Key Laboratory of Low-carbon Green Agriculture in Northwestern China, Northwest A&F University,Yangling 712100,Shaanxi,China
  • Received:2024-11-27 Revised:2025-05-27 Online:2026-03-20 Published:2026-04-13
  • Contact: Xiaoping Wang

摘要:

生物结皮是干旱半干旱区广泛分布的地被植物,对于治理该区域水土流失与调节生态环境稳定性方面具有重要作用。目前生物结皮的研究集中于点尺度的观测,基于遥感技术的大尺度提取方法研究存在明显不足,一定程度上阻碍了生物结皮时空变化、生态水文效应研究。本研究以干旱半干旱区典型流域皇甫川为研究区,考虑地表覆盖的复杂性、时空异质性,利用多个遥感指数协同组合方法,构建基于逐步提取的干旱半干旱区生物结皮提取的遥感模型。该方法采用逐步识别模型,以此提取裸土、植被及生物结皮像元,收集了典型干旱半干旱区皇甫川流域30 m分辨率的生物结皮空间分布数据,并探讨了地形、气候以及土地利用方式对生物结皮空间分布的影响。结果表明:基于土壤调节植被指数(SAVI)、修正土壤调节植被指数(MSAVI)、归一化差值植被指数(NDVI)、新型光合植被指数(NIRV)、生物结皮指数(BSCI)构建的干旱区生物结皮逐步提取模型,不同植被指数间阈值存在显著差异(SAVI<0.13和SAVI≥0.19;MSAVI<0.11和MSAVI≥0.17;0≤NDVI<0.44;0≤NIRV<0.11;5.89≤BSCI<7.28),该模型提取干旱半干旱区生物结皮的总体精度可靠。基于该方法发展了皇甫川流域2021年生物结皮空间分布数据,发现皇甫川流域生物结皮广布,生物结皮像元面积占总面积的21.51%,且生物结皮主要分布在草地、耕地等地区;生物结皮空间分布与研究区各区域降水量之间存在较高的相关性,降水量越大,生物结皮分布越多。本研究重点在于考虑不同地物的光谱差异特征发展干旱半干旱区大尺度生物结皮逐步提取的遥感提取方法,为皇甫川及干旱半干旱区生物结皮研究奠定研究范式,以期为流域生态水文循环研究提供科学参考。

关键词: 生物结皮, 空间分布, 皇甫川流域, 多光谱遥感, 逐步提取

Abstract:

Bio-crust is a widely distributed ground cover plant in arid and semi-arid regions, which plays an important role in controlling soil erosion and regulating the stability of the ecological environment in the region. Currently, the study of bio-crust mainly focuses on the observation of sample area scale, and the large-scale extraction method based on remote sensing technology has significant deficiencies, which, to some extent, hinders the exploraition of the spatial and temporal changes of bio-crust and their ecohydrological effects. In this study, we take Huangfuchuan, a typical drainage basin in the arid area, as the study area, and consider the complexity and spatial and temporal heterogeneity of the ground cover, and use the synergistic combination of multiple remote sensing indices to construct a remote sensing model based on step-by-step extraction of bio-crust. The method uses a stepwise identification model to extract bare soil, vegetation, and bio-crust pixels, develops 30 m-resolution spatial distribution datasets of bio-crust in the Huangfuchuan drainage basin in a typical arid area, and explores the effects of topography, climate, and land use practices on the spatial distribution of biocrust. The results show that there were significant differences in the thresholds between different vegetation index in the stepwise extraction model of bio-crust in arid regions constructed based on the soil adjusted vegetation index (SAVI), Modified soil adjusted vegetation Index (MSAVI), Normalized difference vegetation index (NDVI), Near-infrared reflectance of vegetation (NIRV), and biological soil crusts index (BSCI). (SAVI<0.13 and ≥0.19; MSAVI<0.11 and ≥0.17; 0≤NDVI<0.44; 0≤NIRV<0.11; 5.89≤BSCI<7.28), but the overall accuracy of the model to extract the bio-crust in the arid regions was reliable. The spatial distribution data of bio-crust in Huangfuchuan drainage basin in 2021 were developed, and it was found that the bio-crust in Huangfuchuan drainage basin was widely spread, and the area of bio-crust like element accounted for 21.51% of the total area, and the bio-crust was mainly distributed in the area of grassland, cropland, and other land-use types; There is a high correlation between the spatial distribution of bio-crust and the magnitude of precipitation in each region of the study area, and the larger the precipitation, the more bio-crust are distributed. The focus of this study is to develop a large-scale remote sensing extraction method of bio-crust in arid and semi-arid areas, and to lay down a research paradigm for the study of bio-crust in the Huangfuchuan drainage basin and arid and semi-arid regions, with a view to providing scientific references for the study of ecological and hydrological cycles in the basin.

Key words: bio-crust, spatial distribution, Huangfuchuan drainage basin, multispectral remote sensing, progressive extraction

中图分类号: