Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 31.
  1. Library Resource
    Articles et Livres
    décembre, 2015
    Chine

    The recent increase in the number of tourists has raised serious concerns about grassland degradation by tourism activities in Inner Mongolia. Thus, we evaluated the effects of tourism activities on the vegetation and soil in Hulunbuir grassland. We identified all the plant species, measured the number and height of plants and plant coverage rate, calculated species diversity, and estimated above-ground biomass in the used plot and the non-use plot. We also examined soil hardness, and soil physical and chemical properties in both plots.

  2. Library Resource
    Articles et Livres
    décembre, 2015
    Chine

    Grassland degradation has been caused by overgrazing in Inner Mongolia. Previous studies revealed the effect of grazing pressure on the vegetation and soil. However, that of different land use types (i.e., grazing and mowing) has not been fully understood, though land use has been dramatically changed from grazing to mowing after land contract system was introduced in 1996. The objective of this study, therefore, was to evaluate that effect on the vegetation and soil.

  3. Library Resource
    Articles et Livres
    septembre, 2015
    Chine

    The purpose of this study is to help build a clear picture of grazing in an agriculture region of China, to find out why farmers buy supplemental feed which is used in winter when their farmland is abandoned and covered by weeds. To meet this goal, I used the case of a village where farmers not only supplied but also bought supplemental feed to see how they used farmland. I discovered the following : The land fragmentation causes them to abandon arable field and borrow farmland from others by their relationship. So they don't have enough farmland to plant feed.

  4. Library Resource
    Articles et Livres
    décembre, 2014
    Chine

    The semi-arid grasslands in Inner Mongolia, China have been degraded by long-term grazing. A series of ecological restoration strategies have been implemented to improve grassland service. However, little is known about the effect of these ecological restoration practices on soil carbon and nitrogen storage.

  5. Library Resource
    Articles et Livres
    décembre, 2013
    Chine

    This paper analyzes increasingly individualized herding behavior after the implementation of a grazing ban policy in northern China based on empirical research in 12 pastoralist villages. The findings reveal that de-collectivization of pastureland has not necessarily led to direct changes in individual land use strategies.

  6. Library Resource
    Articles et Livres
    décembre, 2015
    Chine

    Organic carbon (OC) sequestration in degraded semi‐arid environments by improved soil management is assumed to contribute substantially to climate change mitigation. However, information about the soil organic carbon (SOC) sequestration potential in steppe soils and their current saturation status remains unknown. In this study, we estimated the OC storage capacity of semi‐arid grassland soils on the basis of remote, natural steppe fragments in northern China. Based on the maximum OC saturation of silt and clay particles

  7. Library Resource
    Articles et Livres
    décembre, 2015
    Chine

    Desertification, which affects more than two-thirds of the world's arid and semi-arid regions, is a significant global ecological and environmental problem. There is a strong link between desertification of the drylands and emission of CO₂ from soil and vegetation to the atmosphere. The Horqin Sandy Land is a severely desertified area in China's agro-pastoral ecotone due to its fragile ecology, combined with unsustainable land management.

  8. Library Resource
    Articles et Livres
    décembre, 2002
    États-Unis d'Amérique, Chine

    The industrial emission of carbon (C) in China in 2000 was about 1 Pg yr 1, which may surpass that of the United States (1.84 Pg C) by 2020. China’s large land area, similar in size to that of the United States, comprises 124 Mha of cropland, 400 Mha of grazing land and 134 Mha of forestland. Terrestrial C pool of China comprises about 35–60 Pg in the forest and 120–186 Pg in soils. Soil degradation is a major issue affecting 145 Mha by different degradative processes, of which 126 Mha are prone to accelerated soil erosion.

  9. Library Resource
    Articles et Livres
    décembre, 2011
    Chine

    Grassland degradation not only results in soil degradation and severe decreases in land productivity, but also can promote the emission of soil carbon and nitrogen compounds as greenhouse gases into the atmosphere. The primary objective of this study was to characterize the impact of grassland degradation on carbon and nitrogen budgets in Inner Mongolia, China. We investigated the changes of total carbon, organic carbon, inorganic carbon and total nitrogen that occur in a grassland ecosystem (including vegetation and top 30 cm soil layer) in the course of grassland degradation.

  10. Library Resource
    Articles et Livres
    décembre, 2012
    Chine

    Sedge dominated peatlands do not rehabilitate well after being drained for rangelands and specific approaches are required in order to restore these sites. Restoration by blocking drainage canals aims to recover peatland functions, principally by raising the water table. Field surveys in Ruoergai, China identified the status of peatland degradation and satellite image analysis concluded that most of Ruoergai's peatlands are degraded mainly due to drainage and overgrazing.

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