A review of carbon sequestration dynamics in the Himalayan region as a function of land-use change and forest/soil degradation with special reference to Nepal
A review of carbon sequestration dynamics in the Himalayan region as a function of land-use change and forest/soil degradation with special reference to Nepal
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DOI：
10.1016/j.agee.2004.09.007
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发表时间：
2005-02
期刊：
影响因子：
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通讯作者：
T. Upadhyay;P. L. Sankhayan;B. Solberg
中科院分区：
文献类型：
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作者：
T. Upadhyay;P. L. Sankhayan;B. Solberg
兴都库什-喜马拉雅地区土地使用的变化以及森林和土壤退化对二氧化碳排放和全球气候变化具有重要影响，需要进行跨学科研究，分析问题的复杂性。本文代表了在这个方向上的努力，通过审查该地区的土地利用变化，森林/土壤退化及其对碳固存的影响的文献。这项研究的主要目的是记录碳固存知识的影响，土地利用的变化和森林/土壤退化。我们发现很少尝试研究这个问题的整体，并缺乏可靠的数据，在该地区的碳封存的动态相关的基本生态参数。该区域现有的研究记录了按主要土地使用类别分列的土地使用变化、土壤侵蚀造成的流失和土壤有机碳含量的估计数。一些证据表明，土地利用变化和森林/土壤退化对C库有显著影响。根据早期的研究，尼泊尔土地利用变化导致的碳净排放量为6.9× 106至42.1× 106 Mgyear-1。与这些发现相反，我们自己对1994年的估计是1.47× 106 Mgyear-1，代表了薪材消耗和土壤侵蚀造成的碳排放量减去每年植被生长造成的碳固定。最后，提出了一个分析框架，调查碳封存的动态。在审查过去的研究的基础上，似乎有一个很大的潜力，通过改善退化土地的管理，以提高在喜马拉雅地区的植被和土壤中的碳固存。建议在未来的研究工作中，理想情况下，通过以下系统的方法来分析该地区不同的生物物理和社会经济因素所造成的碳固存动态的复杂性。
Land-use changes and degradation of forests and soils in the Hindu Kush Himalayan region have important implications for CO2emissions and global climatic change that calls for an interdisciplinary research to analyse the complexity of the problem. This paper represents an effort in this direction by reviewing the literature on land-use changes, forest/soil degradation and their effects on C sequestration in this region. The main objective of this study was to document knowledge on C sequestration as affected by land-use changes and forest/soil degradation. We found a very few attempts at studying the subject in its entirety, and a lack of reliable data on essential ecological parameters related to the dynamics of C sequestration in the region. Estimates of land-use changes, loss of soil due to erosion and soil organic carbon contents by dominant land-use categories have been documented from the available studies in the region. Some evidence exists to show that the land-use changes and forest/soil degradation affect C pools significantly. The net emissions of C due to land-use changes in Nepal were reported to be 6.9×106to 42.1×106Mgyear−1by earlier studies. In contrast to these findings, our own estimate for the year 1994 was 1.47×106Mgyear−1, representing C emissions from fuelwood consumption and loss of soil due to erosion less C fixation due to annual vegetation growth. Finally, an analytical framework is presented for investigating the dynamics of C sequestration. On the basis of review of past studies, there appeared to be a high potential for enhancing the C sequestration in the vegetation and soils of the Himalayan region through improved management of degraded lands. It is suggested that the complexity of dynamics of C sequestration caused by diverse bio-physical and socio-economic factors in the region needs ideally be analysed by following systems approach in the future research endeavours.