1975—2005年中亚土地利用/覆被变化对森林生态系统碳储量的影响

土地利用/覆被变化(LUCC)对碳循环的影响研究已覆盖全球绝大多数地区,但中亚LUCC对森林生态系统碳库的影响仍属未知。论文以人工林面积、森林产品收获产量及林地转移面积为基础数据,应用Bookkeeping模型,分析了1975—2005年期间三种LUCC方式对中亚森林碳库的影响。近30 a LUCC对其碳库的影响总体表现为碳汇,固碳量为3.07 Tg。植树造林表现出强烈的碳汇功能,总固碳量为12.97 Tg。森林采伐是最主要的碳释放来源,共释放碳5.80 Tg。林地转移呈现较强的碳释放特征,共排放为4.10 Tg。结果表明1975—2005年该区域LUCC对森林碳库具有明显的增汇效应。研究结果将有利于减少LUCC对全球碳收支影响的不确定性。

Sources and Sinks of Carbon Caused by Forest Land Use Change from 1975 to 2005 in Central Asia

The contribution of forest land use change to the carbon source has been researched in most tropical regions, but it is poorly documented for arid forest ecosystem. Using Bookkeeping model, we estimated the sources and sinks of carbon caused by forest land use change between 1975 and 2005 in Central Asia. The results indicated that: The forest land use change performed as carbon sink overall, with total carbon sequestration of 3.07 Tg. The accelerated afforesting led to a strong carbon sequestration (12.97 Tg), while the deforestation was a main carbon source, releasing 5.80 Tg. The woodland transfer also performed as carbon source, releasing 4.10 Tg. We recommend that some efficient measures should be taken on increasing the quality and quantity of forest resources in the future to enhance the forestry carbon sequestration in Central Asia. Therefore, this can offset the carbon loss caused by industrial activities, so as to provide sufficient space for the sustained and healthy development of the economy in Central Asia. This study is conducive to profoundly understand the influence of human activities on global carbon balance.