首页|高寒草地沙漠化土地固碳潜力分析——以黄河源区为例

高寒草地沙漠化土地固碳潜力分析——以黄河源区为例

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沙漠化过程导致草地生态系统的退化和土壤有机碳的流失,增加了陆地生态系统向大气CO_2的排放,使退化土地就成为陆地重要的碳源之一.然而,通过有效的沙漠化防治,沙漠化过程能够得到一定程度的控制,退化土地也会得到恢复.沙漠化土地的恢复将是增加陆地碳汇,减少大气CO_2的有效途径之一.黄河源区沙漠化土地处于正在发展和强烈发展阶段,沙漠化形势严峻.目前沙漠化土地面积达3 519.97 km~2,其中轻度沙漠化土地面积占45.82%、中度沙漠化占26.20%、重度沙漠化土地与极重度沙漠化土地面积分别占13.80%和14.18%.我们设想通过沙漠化治理.使极重度、重度、中度沙漠化得到恢复并转变为轻度沙漠化土地,这将使1907.27 km~2的沙漠化土地得到恢复.根据目前沙漠化土地土壤有机碳密度,我们初步估计将会有10.25×10~6 t的土壤有机碳能够得到固定.在固定的土壤碳中,极重度沙漠化土地、重度沙漠化土地和中度沙漠化土地贡献分别为4%,30%,36%.因此,目前黄河源区沙漠化土地具有较高的固碳潜力,通过沙漠化的有效治理,不仅能够改善区域生态环境,促进区域社会经济的可持续发展,而且将使黄河源区成为陆地碳汇的重要区域.
Potential to Sequestering Carbon from Atmosphere through Rehabilitating Desertified Land in the Head Water of the Yellow River
Desertification resulted grassland ecosystem deterioration and soil organic matter lost,leading to terrestrial carbon being released to the atmosphere.Therefore.degraded land would become a major carbon source.However,through effective measures for combating desertification,desertification process could be controlled to some extent and the degraded lands could be restored.Restoring desertified lands would be all alternative approach to sequester the carbon from atmosphere.If we assume that most severe,severe,moderate desertitied lands can be rehabilitated and converted to mild desertified land through combating desertifieation using rational land use.the total 1 907.27 km~2 of various types of desertified lands could be rehabilitated in the headwater area of the Yellow River.Based on the present organic carbon content in desenified land.we could make some preliminary estimates of total 10.25×10~6 t organic carbon can be fixed in the soil.Ofthese fixations most severe.severe.modcrate desertified lands would contribute,respectively,34%,30%,36%.Therefore,present desertitied lands have potential to sequestering carbon from atmosphere through rehabilitating desertified land.

high and cold grass landrehabilitating desertified landorganic carbon contentpotential to sequestering carbon from atmospherehead water of the Yellow River

曾永年、马正龙、冯兆东

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中南大学信息物理工程学院,中南大学空间信息技术与可持续发展研究中心,湖南,长沙,410083

兰州大学西部环境教育部重点实验室,甘肃,兰州,730000

高寒草地 沙漠化治理 土壤有机碳 固碳潜力 黄河源区

国家自然科学基金国家自然科学基金教育部重大项目教育部骨干教师资助项目

400710664077119810425

2009

山地学报
中科院水利部成都山地灾害与环境研究所 中国地理学会

山地学报

CSTPCDCSCD北大核心
影响因子：1.275
ISSN：1008-2786
年,卷(期)：2009.27(6)
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