Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 8.
  1. Library Resource
    Articles et Livres
    décembre, 2014
    Chine

    The pattern of soil respiration and its responsible factors are still unclear in subalpine ecosystems. In this study, we used a static chamber system to measure soil respiration in a primary Abies fabri (Masters) Craib forest, a secondary A. fabri forest and a clear-cut land on Gongga Mountain, east of Tibetan Plateau in China. Our results showed there were substantial diurnal and temporal variations in these three subalpine ecosystems. The diurnal coefficient of variation (CV) of soil respiration was lowest in primary forest (20.5%), and highest in clear-cut land (40.4%).

  2. Library Resource
    Articles et Livres
    décembre, 2014
    Chine

    The Chinese government started implementation of the Grain for Green Project (GGP) in 1999, aiming to convert cropland to forestland to mitigate soil erosion problems in areas across the country. Although the project has generated substantial environmental benefits, such as erosion reduction, carbon sequestration and water quality improvements, the magnitude of these benefits has not yet been well quantified due to the lack of location-specific data describing the afforestation efforts.

  3. Library Resource
    Articles et Livres
    décembre, 2014
    Chine

    Six national programs—including the Natural Forest Protection Program (NFPP), Sloping Land Conversion Program (SLCP), Desertification Combating Program around Beijing and Tianjin (DCBT), Shelterbelt Network Development Program (SNDP), Wildlife Conservation and Nature Reserve Protection Program (WCNR), and Industrial Timberland Plantation Program (ITPP)—were adopted as means to achieve the Chinese Government sustainable development national policy. While the programs have made promising progress circa 10 yr at the national level, problems exist at the regional and locals levels.

  4. Library Resource
    Articles et Livres
    décembre, 2014
    Chine

    In coastal sandy soils, the establishment of a plant cover is fundamental to avoid degradation and desertification processes. A better understanding of the ability of plants to promote soil microbial process in these conditions is necessary for successful soil reclamation. The current study was to investigate the ability of four different plant species to regenerate the microbiological processes in the rhizosphere soil and to discuss which species were the most effective for the reclamation of the coastal zone.

  5. Library Resource
    Articles et Livres
    décembre, 2014
    Chine, Norvège

    Efficient plant nutrition and good agronomical practices are essential to meet future challenges in agriculture, while high land productivity is an obvious measure to integrate food security and environment protection. However, nutrient management in agriculture, including fertilizer applications and issues linked to nutrient losses, are highly complex due to multidimensional variability. Thus, robust systems of measurements and documentation, including planning, are required in order to support decision-making.

  6. Library Resource
    Articles et Livres
    décembre, 2014
    Chine

    Estimates of changes and possible causes of regional soil organic carbon (SOC) are critical for evaluation of potential responses of terrestrial biosphere to global changes. A total of 382 soil samples, collected in the 1980s from four counties in the Corn Belt of northeastern China, and of 1,514 samples collected in 2005 from the same area, were examined for SOC concentrations. Spatial and temporal SOC concentrations were evaluated after the 25-year interval using geostatistics and kriging interpolation method.

  7. Library Resource
    Articles et Livres
    décembre, 2014
    Chine

    Remote sensing is a useful technology for monitoring the spatial distribution and expansion of built-up and bare land areas. One effective approach, known as the normalized difference built-up index (NDBI), has been promoted for identifying built-up areas based on Landsat Thematic Mapper (TM)/Enhanced Thematic Mapper (ETM+) data.

  8. Library Resource
    avril, 2014
    Japon

    This research explores the activities of community institutions in achieving sustainable forest management (SFM) and sustained forest cover. Three institutions representing the administrative, economic, and social/traditional institutions were identified. The institutions had 30 forest management activities and satisfied about 66% of SFM Criteria and Indicators. A loss of 122 ha of forest cover was estimated over the last 30 yr, attributed to conversion of forests to built-up areas.

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