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Mostrando ítems 1 a 9 de 15.
  1. Library Resource
    Artículos de revistas y libros
    Diciembre, 2015
    China

    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

  2. Library Resource
    Artículos de revistas y libros
    Diciembre, 2009
    China

    1. China's Grain for Green Project is a rapid landscape-scale shift in ground cover and land use with significant implications for biodiversity. From 1998 to 2005, we carried out field studies to examine the landscape-level impacts of this project, and to provide a practical example of the successes and failures of a large-scale attempt to restore a vulnerable environment. 2. In a northern part of China's Shaanxi Province, our results indicated that the total vegetation cover in areas covered by this project increased from 29·7% in 1998 to 42·2% in 2005.

  3. Library Resource
    Artículos de revistas y libros
    Diciembre, 2010
    Japón

    This study was conducted to determine the reproductive characteristics of Barbarea vulgaris under different disturbance regimes (mowing and tilling) in two different habitats: a levee and a wheat field. On the levee, 77 of the 114 individuals that had had their floral stalks removed by the first mowing produced new rosettes at the basal part of the stem during the same growing season. The plants that were mowed four times per year had a significantly greater survival rate than the plants that were mowed twice per year.

  4. Library Resource
    Artículos de revistas y libros
    Diciembre, 2012
    China

    The purpose of this paper is to empirically track the progress and consequences of the emergence of cultivated land markets in China since 2000. We draw on a set of nationwide, household‐level panel data (for 2000 and 2008) and find that the markets for cultivated land rental have emerged robustly. According to our data, 19 of China's cultivated land was rented in farm operators in 2008. We also find that the nature of China's cultivated land rental contracts has become more formal and lengthened the period of time that the tenant is able to cultivate the rented‐in plots.

  5. Library Resource
    Artículos de revistas y libros
    Diciembre, 2006
    China

    Notwithstanding the ambiguous research and productivity promoting effects of plant variety protections (PVPs) even in developed countries, many developing countries have adopted PVPs in the past few years, in part to comply with their Trade-Related Aspects of Intellectual Property Rights (TRIPS) obligations. Seeking and maintaining PVPs reserves options to an expected revenue stream from the future sale of protected varieties, the value of which varies for a host of reasons.

  6. Library Resource
    Artículos de revistas y libros
    Diciembre, 2014
    India, China

    The onset of the grain price spikes in late 2007 heralded a heated discussion among economists and policy makers on the source of the problem and appropriate policy responses. The subsequent rounds of price surges hit landless poor consumers hard, and transferred billions of dollars from them to landowners worldwide. Economists offered a list of highly plausible explanations for the recent jumps in grain price levels.

  7. Library Resource
    Artículos de revistas y libros
    Diciembre, 2009
    Viet Nam, China

    This study examines the impact of current land policies in China and Vietnam on women's entitlement to land, women's wellbeing and gender power relations. The ethnographic study of one village in each of the two countries contextualizes women's lives in the kinship and marriage system in which power and gender relations are embedded. Current land policies, when implemented in the existing kinship and marriage system, make women's entitlement to land more vulnerable than men's, limit women's choices and weaken their power position.

  8. Library Resource
    Artículos de revistas y libros
    Diciembre, 2015
    China

    Soil organic matter (SOM) is a key property determining soil functions and a major form of carbon stored in soil. Understanding the spatial and temporal variability of SOM and the driving forces responsible for spatial and temporal changes is important to assess regional soil quality and carbon sequestration potential and, particularly, to establish better practices for land use and management. We evaluated the spatio‐temporal change in SOM content from 1979–1982 to 2006 and its driving forces in Jiangsu Province, East China, using geostatistics.

  9. Library Resource
    Artículos de revistas y libros
    Diciembre, 2008
    Mongolia

    1. The concept of threshold has become important in ecology, but the nature of potential threshold responses of vegetation to grazing in rangeland ecosystems remains poorly understood. We aimed to identify ecological thresholds in vegetation changes along a grazing gradient and to examine whether threshold changes were expressed similarly at a variety of ecological sites. 2. To accomplish this, we surveyed the vegetation along grazing gradients at 10 ecological sites, each located at different landscape positions in Mongolia's central and southern rangelands.

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