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  • CSIRO Publishing  (3)
  • 1
    Online Resource
    Online Resource
    Monitoring and prediction of soil moisture spatial–temporal variations from a hydropedological perspective: a review
    CSIRO Publishing ; 2012
    In:  Soil Research Vol. 50, No. 8 ( 2012), p. 625-
    Details
    In: Soil Research, CSIRO Publishing, Vol. 50, No. 8 ( 2012), p. 625-
    Abstract: Accurate prediction of soil moisture spatial–temporal variations remains critical in agronomic, hydrological, pedological, and environmental studies. Traditional approaches of soil moisture monitoring and prediction have limitations of being time-consuming, labour-intensive, and costly for direct field observation; and having low spatial resolution for remote sensing, and inconsistent accuracy and reliability for landscape feature (e.g. topography, land use, vegetation) modelling. Innovative and effective approaches for accurate soil moisture simulation are needed. Pedological properties, including soil structure, particle size distribution, porosity, horizon, redox feature, and organic matter content, have been accepted as important factors controlling soil moisture and can be potentially used in soil moisture prediction. However, pedological properties mostly lack quantification (e.g. redox feature, horizon, soil structure), and soil sampling and analysis are time-consuming and costly, especially at large spatial scale. These limitations have restricted the utilisation of pedological information to predict soil moisture spatial–temporal variations at different spatial scales. To overcome these difficulties, new tools including geophysical tools and computed tomography, and new methods including mining soil survey information and integrating pedological information with landscape features and modelling, are proposed in this paper.
    Type of Medium: Online Resource
    ISSN: 1838-675X
    URL: Article
    DOI: 10.1071/SR12228
    Language: English
    Publisher: CSIRO Publishing
    Publication Date: 2012
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Soil erosion in the Three Gorges Reservoir area
    CSIRO Publishing ; 2011
    In:  Soil Research Vol. 49, No. 3 ( 2011), p. 212-
    Details
    In: Soil Research, CSIRO Publishing, Vol. 49, No. 3 ( 2011), p. 212-
    Abstract: Spatial and temporal change in soil erosion in the Three Gorges Reservoir area since the water storage of the reservoir began filling to 135 m in 2003 is poorly understood. Using a modified soil erosion model, this study quantifies and analyses change in the extent and intensity of soil erosion in the region from 2000 to 2008. MODIS-NDVI remote sensing data (with 250 m spatial resolution) are used in the modelling and analysis of the study. The total amount, area, and intensity of soil erosion in the reservoir region presented a declining trend from 2000 to 2008. Yet there was an anomaly in the trend, in which extreme soil erosion occurred in 2003 and lasted until 2005. The average volume of soil erosion per year decreased by 4.10 × 106 t and the mean area of land experiencing soil erosion reduced by 1129.6 km2 from the pre-storage period (2000–02) to post-storage period II (2006–08). Land suffering soil erosion at high, very high, and severe levels mainly comprises forest and cropland on slopes with gradients ≥15° and is largely distributed in the eastern and south-western sections of the reservoir area. Land experiencing soil erosion at slight or moderate levels mainly involves cropland and forest on slopes with gradients ≥10° in the central section of the reservoir area. The impact of the Three Gorges Project on soil erosion since 2000 has been mainly mediated through three mechanisms: near-resettlement of rural and urban people; increased frequency and severity of geological hazards induced by rising storage of the reservoir; and implementation of ecological projects in the region. Through the former two mechanisms, soil erosion in the affected communities has been exacerbated, while the ongoing ecological projects appear to offset both the extent and intensity of soil erosion in the reservoir region. Other important factors influencing soil erosion include urban reconstruction and expansion, varying intensity of precipitation, and soil degradation.
    Type of Medium: Online Resource
    ISSN: 1838-675X
    URL: Article
    DOI: 10.1071/SR10191
    Language: English
    Publisher: CSIRO Publishing
    Publication Date: 2011
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  • 3
    Online Resource
    Online Resource
    The aquatic ecological health-state assessment and the influencing mechanism of Poyang Lake
    CSIRO Publishing ; 2023
    In:  Marine and Freshwater Research Vol. 74, No. 10 ( 2023-2-16), p. 807-816
    Details
    In: Marine and Freshwater Research, CSIRO Publishing, Vol. 74, No. 10 ( 2023-2-16), p. 807-816
    Abstract: Context Freshwater lakes are still facing a series of problems, e.g. a decline in water quality, and a decrease in biodiversity. Thus, assessing the state of aquatic ecological health of the lake has drawn widespread attention from scholars both at home and abroad. Aims This study aims to assess the state of aquatic ecological health of Poyang Lake and analyse the influencing factors. Methods The long-term (2007–2018) site-monitoring data were analysed on the basis of the extension–evaluation method and correlation-analysis method. Key results The results showed that the aquatic ecological health was mainly ‘good’, and remarkable seasonal differences were observed. The seasonal order of relative aquatic ecological health could be expressed as the wet season being better than the dry season, whereas the rising season was similar to the retreating season. And the pollutant discharged into the lake was found to be the key factor, and the hydrological conditions led to seasonal differences in the state of aquatic ecological health of Poyang Lake. Conclusions Consequently, scholars and policymakers should focus on both nutrient concentrations and hydrological conditions, which are the key factors influencing the aquatic ecological health of Poyang Lake. Implications The results of this study have provided a theoretical and practical basis of the causes of ecological deterioration and should help with ecological-health protection of the large lakes connected with the Yangtze River.
    Type of Medium: Online Resource
    ISSN: 1323-1650 , 1448-6059
    URL: Article
    DOI: 10.1071/MF22154
    Language: English
    Publisher: CSIRO Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1283028-8
    SSG: 12
    SSG: 21,3
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