PLANT TRAITS AND BIOMASS ALLOCATION OF GENTIANA HEXAPHYLLA ON DIFFERENT SLOPE ASPECTS AT THE EASTERN MARGIN OF QINGHAI-TIBET PLATEAU

Based on field geological survey and stratigraphic profile survey in the eastern margin of the Qinghai-Tibet Plateau, the basic characteristics and evolution of geological structure in the eastern margin of the Qinghai-Tibet Plateau are studied. The Dongyuan area of the Qinghai-Tibet Plateau is divided into the late Cenozoic period and the current period. During the Late Cenozoic, the Pliocene Xigeda lacustrine deposits develops from 4.2 MaBP to 2.6 MaBP, with 9 cold-warm climate change stages. There are 4.3 MaBP old glacial period in this area, and 5 extreme paleoclimate events in Quaternary. At present, the horizontal movement intensity and mode of different tectonic zones are determined by the northward extrusion, eastward extrusion and rotation around the eastern tectonic junction in the study area, and the stages of the movement state changing with time are related to the gestation and occurrence of extra-large earthquakes. At present, the three-dimensional crustal movement shows that the tectonic activity differentiation of mountain and basin, which is related to tectonic dynamic environment and deep material activity, is related to the compression, shortening and uplift of plateau mountain and the extension and subsidence of basin, reflecting the inheritance of neotectonic activity. Through practical analysis, it is found that the eastern margin of the Qinghai-Tibet Plateau is composed of Minshan fault block and Longmenshan structural belt. The left-lateral dislocation of Minjiang fault is roughly the same as the vertical dislocation. In Longmenshan tectonic belt, the right-lateral dislocation of Maowen-Wenchuan fault, Beichuan-Yingxiu fault and other main faults is the same as the vertical dislocation.

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The relationship of the main root-shoot morphological characteristics and biomass allocation of Saussurea salsa under different habitat conditions in Sugan lake wetland on the northern margin of the Qinghai-Tibet Plateau

Ecological Indicators ◽

10.1016/j.ecolind.2021.107836 ◽

2021 ◽

Vol 128 ◽

pp. 107836

Author(s):

Qun Li ◽

Cheng-Zhang Zhao ◽

Man-Ping Kang ◽

Xiao-Ya Li

Keyword(s):

Biomass Allocation ◽

Morphological Characteristics ◽

Tibet Plateau ◽

Habitat Conditions ◽

Main Root ◽

Northern Margin ◽

Relationship Of ◽

Qinghai Tibet Plateau ◽

The Relationship

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Drainage Density and Its Controlling Factors on the Eastern Margin of the Qinghai–Tibet Plateau

Frontiers in Earth Science ◽

10.3389/feart.2021.755197 ◽

2022 ◽

Vol 9 ◽

Author(s):

Hongshan Gao ◽

Fenliang Liu ◽

Tianqi Yan ◽

Lin Qin ◽

Zongmeng Li

Keyword(s):

Vegetation Index ◽

Normalized Difference Vegetation Index ◽

Arid Environment ◽

Drainage Density ◽

Tibet Plateau ◽

Vegetation Coverage ◽

Mean Annual Precipitation ◽

Eastern Margin ◽

Qinghai Tibet Plateau ◽

Planation Surfaces

The drainage density (Dd) is an important index to show fluvial geomorphology. The study on Dd is helpful to understand the evolution of the whole hydrological and geomorphic process. Based on the Shuttle Radar Topography Mission 90-m digital elevation model, the drainage network of basins along the eastern margin of the Qinghai–Tibet Plateau is extracted using a terrain morphology-based method in ArcGIS 10.3, and Dd is calculated. The spatial characteristics of Dd are analyzed, and the relationship between Dd and its influencing factors, e.g., the topography, precipitation, and vegetation coverage, is explored. Our results show that terrains with a plan curvature ≥3 can represent the channels in the study area. Dd ranges from 2.5 to 0.1 km/km2, increases first, and then decreases from north to south on the eastern margin of the Qinghai–Tibet Plateau. Dd decreases with increasing average slope and average local relief. On the low-relief planation surfaces, Dd increases with increasing altitude, while on the rugged mountainous above planation surfaces, Dd decreases rapidly with increasing altitude. Dd first increased and then decreased with increasing mean annual precipitation (MAP) and normalized difference vegetation index (NDVI), and Dd reaches a maximum in the West Qinling Mountains with a semi-arid environment, indicating that Dd in different climatic regions of the eastern margin of the Qinghai–Tibet Plateau was mainly controlled by precipitation and vegetation.

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