Dawen Qian

ORCID: 0000-0002-9807-8097
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About
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Research Areas
  • Rangeland Management and Livestock Ecology
  • Land Use and Ecosystem Services
  • Ecology and Vegetation Dynamics Studies
  • Soil Carbon and Nitrogen Dynamics
  • Soil erosion and sediment transport
  • Wildlife Ecology and Conservation
  • Cryospheric studies and observations
  • Climate change and permafrost
  • Wildlife-Road Interactions and Conservation
  • Plant Water Relations and Carbon Dynamics
  • Plant Ecology and Soil Science
  • Remote Sensing in Agriculture
  • Soil and Unsaturated Flow
  • Peatlands and Wetlands Ecology
  • Conservation, Biodiversity, and Resource Management
  • Remote Sensing and Land Use
  • Forest Management and Policy
  • Species Distribution and Climate Change
  • Bioenergy crop production and management
  • Phytochemicals and Antioxidant Activities
  • Rangeland and Wildlife Management
  • Mycorrhizal Fungi and Plant Interactions
  • Atmospheric and Environmental Gas Dynamics
  • Tea Polyphenols and Effects
  • Traditional Chinese Medicine Analysis

Chongqing Normal University
2023-2024

Xinjiang Institute of Ecology and Geography
2018-2023

Chinese Academy of Sciences
2017-2023

Qinghai Tibetan Hospital
2021

Northwest Institute of Plateau Biology
2021

University of Chinese Academy of Sciences
2018

Northwest Institute of Eco-Environment and Resources
2017-2018

Alpine shrub-meadow is an important ecosystem type on the Qinghai-Tibetan Plateau, providing a variety of services while supporting livelihoods pastoralists. However, there clear lack understanding changes in spatial patterns and alpine degradation. This study combined aerial photography ground surveys to investigate analyse impact degradation their services, relationships between services. The results showed that led fragmentation patchiness shrub-meadow, as evidenced by decrease proportion...

10.1016/j.ecolind.2022.108541 article EN cc-by-nc-nd Ecological Indicators 2022-01-10

Alpine grassland has very important water conservation function. Grassland degradation seriously affects the function; moreover, there is little understanding of change state during restoration. Our study aims to bridge this gap and improve our changes in soil moisture restoration process. In study, storage, vegetation, meteorology a non-degradation (grazing intensity 7.5 sheep/ha) severely degraded 12-18 were monitored Qinghai-Tibet Plateau for seven consecutive years. We used correlation,...

10.3389/fpls.2021.778656 article EN cc-by Frontiers in Plant Science 2021-12-16

Abstract Aboveground biomass (AGB) and belowground (BGB) allocation productivity–richness relationship are controversial. Here, we assessed AGB BGB the at community level across four grassland types based on data collected from 80 sites Qinghai Plateau during 2011–2012. The reduced major axis regression general linear models were used showed that (a) median values of significantly higher in alpine meadow than other three types; ratio root to shoot (R/S) was desert (36.06) intemperate...

10.1002/ece3.5920 article EN cc-by Ecology and Evolution 2019-12-11

The degradation of alpine grasslands directly affects their ability to conserve water, but changes in soil water storage grassland under different degrees are poorly understood. Here, we selected four plots along a gradient: no-degradation (NG), lightly degraded (LG), moderately (MG) and severely (SG). We then applied an automatic moisture monitoring system study processes. Results revealed significant (p < 0.05) differences among NG, LG, MG SG. Specifically, LG lost 35.9 mm compared with...

10.3390/su12062523 article EN Sustainability 2020-03-23

Abstract Plateau pika burrows are common feature of degraded grassland in the Qinghai–Tibet (QTP) and serve as an important indicator activity degradation. However, current understanding spatial pattern changes their critical thresholds across a degradation gradient alpine is deficient. In this study, we investigated quantified plateau under typical shrub meadows northeastern QTP using unmanned aerial vehicle landscape metrics. The meadow leads to change from two‐layered structure mosaic...

10.1002/ece3.8176 article EN Ecology and Evolution 2021-10-07

Alpine shrub meadows hold significant importance as grassland ecosystems on the Qinghai-Tibetan Plateau (QTP). They provide a range of vital ecosystem services (ESs) and are commonly utilized summer pastures by herders, resulting in short grazing periods high intensities. Unfortunately, these practices have led to varying degrees degradation, thereby affecting sustainable provision ESs. However, current knowledge regarding changes ESs their characteristics under influence particularly...

10.1002/ece3.10351 article EN cc-by Ecology and Evolution 2023-07-01

Abstract The accurate estimation of evapotranspiration (ET) is essential for assessing water availability and requirements regional‐scale terrestrial ecosystems, understanding the hydrological cycle in alpine ecosystems. In this study, two large‐scale weighing lysimeters were employed to estimate magnitude dynamics actual a humid Kobresia meadow from January 2018 December 2019 on northeastern Qinghai‐Tibetan Plateau (QTP). results showed that daily ET averaged 2.24 ± 0.10 mm day −1...

10.1002/hyp.14051 article EN Hydrological Processes 2021-01-20

Understanding the impact of grazing management strategies on alpine meadow is fundamental importance for grassland conservation. However, vegetation and soil properties in response to different implemented Kobresia pygmaea remains elusive. In this study, a medium-term field experiment with three (free grazing, FG; no NG; reduced RG) was conducted. The results revealed that total aboveground biomass (AGB), cover litter increased significantly under NG treatment, whereas belowground (BGB)...

10.1016/j.gecco.2023.e02680 article EN cc-by-nc-nd Global Ecology and Conservation 2023-10-31

As emerging woody oil crops, the tree peony seeds recently have been attracting great attention for their metabolites and bioactivities. In this research, phytochemical profiles of seed coats peonies from different production regions were investigated systematically. Twelve phytochemicals separated prepared, mainly belonging to stilbenes. A variation in stilbene content was detected three Paeonia plants, ostii (POSC) had significantly higher contents compounds than other species. There...

10.1039/d1fo02341a article EN Food & Function 2021-01-01

One of the challenges managing grasslands sustainably is conflict between different ecosystem services they provide. This especially evident in Qinghai-Tibetan Plateau (QTP) region, where fragile alpine ecosystems make balancing needs grassland conservation and development difficult. However, our current understanding relationships drivers degraded shrub meadows on QTP insufficient. To address this, we studied forage provisioning water retention a meadow northeastern QTP. We analyzed changes...

10.3390/d15050596 article EN cc-by Diversity 2023-04-26

The methane (CH4) fluxes in grasslands are sensitive to changes precipitation and soil nitrogen concentrations, which was poorly understood, especially on the Tibetan Plateau. Therefore, an experiment conducted from May 2012 October 2013, by using static chamber technique gas chromatography method. We set up five treatments: increased 2 g m-2 NH4NO3 treatment (2gN); 4 (4gN); with 20% (Pre), added (20%) (N+Pre), a control (CK). treatments showed decreasing CH4 uptake rates following order: CK...

10.3161/15052249pje2020.68.2.001 article EN Polish Journal of Ecology 2020-09-22

Micro-patches are the basic unit of grazing ecosystems; characteristics these micro-patches relatively stable in species under different intensities same vegetation, but obviously terms distribution pattern. This leads to differentiation plant community numerical intensities. Understanding driving force soil nutrient variation disturbances will help us comprehend regulation strategy and adaptation mechanisms ecosystem against over-disturbance. We designed four scales: spatial (three typical...

10.3390/d14080656 article EN cc-by Diversity 2022-08-14

Understanding the mechanisms of diversity–productivity relationships is a central question in community ecology. Grazing main driving force affecting biodiversity, function, and stability grassland ecosystems, thus should play an important role mediating diversity-productivity relationships. In this study, we examined effect grazing intensity on both aboveground biomass biodiversity explored relationship between them alpine meadow ecosystems Sanjiangyuan, which source Yangtze, Yellow,...

10.3390/d14111002 article EN cc-by Diversity 2022-11-19

Glomalin-related soil protein (GRSP) is a recalcitrant glycoprotein mainly produced by arbuscular mycorrhizal fungi and contributes to carbon sequestration. Human activities (grazing, fertilization, etc.) can change plant productivity, pool, microbial community in an alpine grassland ecosystem. However, no study has reported on the effect of human GRSP. Besides, interaction between environmental factors GRSP unknown. This assessed response grazing intensity gradients fertilization...

10.22541/au.170668521.19685345/v1 preprint EN Authorea (Authorea) 2024-01-31

Grassland degradation poses a significant challenge to achieving the Sustainable Development Goals (SDGs) on Qinghai–Tibetan Plateau (QTP). Effective monitoring of grassland is essential for ecological restoration. Hyperspectral technology offers efficient and accurate identification degradation. However, influence observation time, data analysis methods classification techniques accuracy identifying alpine grasslands remains unclear. In this study, spectral reflectance degraded meadow,...

10.3390/rs16203884 article EN cc-by Remote Sensing 2024-10-18
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