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  • Liang, Boyi  (2)
  • Geography  (2)
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  • Geography  (2)
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  • 1
    Online Resource
    Online Resource
    Impact of bedrock geochemistry on vegetation productivity depends on climate dryness in the Guizhou karst of China
    SAGE Publications ; 2021
    In:  Progress in Physical Geography: Earth and Environment Vol. 45, No. 1 ( 2021-02), p. 20-32
    Details
    In: Progress in Physical Geography: Earth and Environment, SAGE Publications, Vol. 45, No. 1 ( 2021-02), p. 20-32
    Abstract: The Guizhou karst area is one of the largest continuous areas of karst in the humid climate zone and is representative of karst landforms in China. Large portions of the karst system are characterized by extremely shallow soils underlain by weathered bedrock and water deficits are common. Although the distribution of ecosystem productivity is largely related to variations in the temperature and precipitation, the influence of the substrate in karst areas requires further exploration. We explored the relative importance of the bedrock geochemistry (characterized by the concentrations of Ca, Mg and Si) and climatic factors (temperature and precipitation) to explain the spatial variability in gross primary productivity (GPP) with various degrees of water deficit during the time period 2001–2015. Our results show that the impact of bedrock geochemistry is an important parameter in changing the original relationship between climate and the GPP. The bedrock geochemistry functioned as a “regulator” of the relation between climate and the GPP, which strengthened with decreasing climate favourability. The variations in GPP and surface water storage were significantly different when different elements (Ca, Mg or Si) were dominant. The Mg-rich regions showed the greatest annual variations in the GPP, whereas the Si-rich regions had the strongest surface water storage potential to support vegetation growth. The results of our study are important for systematically evaluating the effects of climate on vegetation productivity and provide a benchmark for global vegetation modelling predictions.
    Type of Medium: Online Resource
    ISSN: 0309-1333 , 1477-0296
    URL: Article
    DOI: 10.1177/0309133320936085
    RVK:
    RA 1000
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2006623-5
    SSG: 14
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Forestation does not necessarily reduce soil erosion in a karst watershed in southwestern China
    SAGE Publications ; 2021
    In:  Progress in Physical Geography: Earth and Environment Vol. 45, No. 1 ( 2021-02), p. 82-97
    Details
    In: Progress in Physical Geography: Earth and Environment, SAGE Publications, Vol. 45, No. 1 ( 2021-02), p. 82-97
    Abstract: Forestation as part of the Returning Farmland to Forest Project was implemented to mitigate soil erosion in southwestern China. However, whether forestation has effectively reduced soil erosion in southwestern China remains unclear, mostly because of the lack of monitoring forest cover change and soil erosion at watershed scales. We interpreted forest cover change from satellite images and simulated soil erosion changes for the period of 1986–2018 in the Chong’an River Basin with the Water and Tillage Erosion Model and Sediment Delivery Model. Our results show that the change in forest cover has the highest correlation coefficient with the sediment yield in the watershed, with an obvious inverse phase relationship between them for all the simulated years. From 2002 to 2014, large-scale forestation and frequent droughts caused the forest cover to vary, resulting in significant changes in the annual soil erosion amount. Because crevices favoring tree growth are more developed in limestone than in dolomite, the forest cover reduction on dolomite is significantly higher than that on limestone under severe droughts in karst areas. Our study implied that the function of forestation in preventing soil erosion depends on lithology in karst areas.
    Type of Medium: Online Resource
    ISSN: 0309-1333 , 1477-0296
    URL: Article
    DOI: 10.1177/0309133320958613
    RVK:
    RA 1000
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2006623-5
    SSG: 14
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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