Estimation of the Tibetan Wild Ass Population in Gaize County of Chang Tang Plateau based on the Belt Transect Method and Random Forest Model

Tian, Qiao; Xu, Zhongfeng; Wei, Ziqian

doi:10.5814/j.issn.1674-764x.2022.05.010

Cited by 3 publications

(2 citation statements)

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“…The Changtang Plateau has an average altitude of ~4800 meters and includes a wide variety of landscapes including plains, hügellands, and mountains, and it is surrounded by the Tanggula Mountains, the Nyainqêntanglha Mountains, and the Kailash Range (Xu et al, 2020). It is cold and dry on the Changtang Plateau because the mountains on the southern side block the warm and humid airflow from the Indian Ocean (Cuo et al, 2014;Tian et al, 2022). Therefore, the climate and hydrography of the Changtang Plateau both result in widespread saline lakes.…”

Section: Resultsmentioning

confidence: 99%

A framework of freshwater and saline lake typology classification through leveraging hydroclimate, spectral, and literature evidence

Ding,

Wang,

Song

et al. 2023

Preprint

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Separating saline and freshwater lakes is of immense importance for monitoring lentic ecosystems and assessing surface freshwater availability. However, conventional lake typology often relies on in situ salinity measurements, thus limiting the feasibility of a global application. To enable an effective workaround, we here propose and test a framework that classifies saline and freshwater lakes through systematic, integrated leveraging of hydrological, climatological, spectral, and literature evidence. In principle, saline lakes were sequentially identified if a lake is (1) located at the drainage terminal where salinity tends to build up as a result of lacking surface outflow (hydrological evidence), (2) distributed in an arid/semiarid climate with lacustrine evaporites visible from a high-resolution multispectral image (climatological and spectral evidence), or (3) documented to be (sub)saline or have measured salinity exceeding the maximum freshwater threshold (literature evidence). We applied the HydroSHEDS hydrography dataset, the Köppen-Geiger climate classification, and a large volume of spectral satellite images and literature to implement this framework. This framework was tested on the Tibetan Plateau using the Landsatbased, 30-m-resolution UCLA circa-2015 global lake mask, and the result was benchmarked against the Chinese national lake survey. Our collected literature shows a 95% agreement between the lake types classified using hydrological, climatological, and spectral evidence alone and those documented in the literature. After further corrections based on the literature evidence, our final classification reached an overall accuracy of nearly 70% in terms of lake count and 94% in lake area. Given such promising accuracies, we further applied our framework to Australia, showcasing its effectiveness for lake typology classification without additional in situ surveys across the world's most saline continent. While our method, in theory, results in a conservative recognition of saline lakes and should not be considered a complete substitute for in situ surveys, the proposed 3 framework demonstrates potential for performing global-scale freshwater and saline lake typology classification with reasonable accuracies, using only remote sensing images, open-source hydrography and climate data, and existing literature.

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Section: Resultsmentioning

confidence: 99%

A framework of freshwater and saline lake typology classification through leveraging hydroclimate, spectral, and literature evidence

Ding,

Wang,

Song

et al. 2023

Preprint

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show abstract

“…驴、藏原羚种群数量，采用受试工作特征曲线下面积(area under curve, AUC)进行精度验证 [37] 。 2 结果分析只；黄青东智等 [36] 于 2020 年冷季开展样线调查，估算出黄河源园区藏野驴、藏原羚的种群数量分别为 2400～7632 头、 1765～3219 只 [36] 。本文估计的野生动物种群规模低于杨帆等 [30] 、 Gao 等 [33] 的结果，与李欣海等 [39] 、黄青东智等 [36] 的结果接近。根据本文方法及数据计算，可知 2015-2017 年玛多县畜兽争草相对强度在 1/4.5~1/7.3 [25,30,33] 。本文显示玛多县畜兽争草相对强度为 1/14.7，畜兽争草强度有所下降。对照全球陆生野生哺乳动物与家畜的生物量之比 (1/29) [40] ，可知研究区畜兽冲突强度仍较大。 [30] 、低于耿远月等 [28] 的结果。原因可能是，本文样方调查得到的可食牧草产量比例高于杨帆等 [30] 的 0.6 的经验值，耿远月等 [28] 则没有严格区分地上生物量和可食牧草产量。由…”

Section: 研究区域概况unclassified

Intensity of competition for forage between livestock and wild herbivores based on grassland carrying capacity

WANG,

XU,

QIAO

et al. 2023

Progress in Geography

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A framework of freshwater and saline lake typology classification through leveraging hydroclimate, spectral, and literature evidence

Ding,

Wang,

Song

et al. 2024

Journal of Hydrology

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Estimation of the Tibetan Wild Ass Population in Gaize County of Chang Tang Plateau based on the Belt Transect Method and Random Forest Model

Cited by 3 publications

References 10 publications

A framework of freshwater and saline lake typology classification through leveraging hydroclimate, spectral, and literature evidence

A framework of freshwater and saline lake typology classification through leveraging hydroclimate, spectral, and literature evidence

Intensity of competition for forage between livestock and wild herbivores based on grassland carrying capacity

A framework of freshwater and saline lake typology classification through leveraging hydroclimate, spectral, and literature evidence

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