Effects of climate change on biomass carbon sequestration in old-growth forest ecosystems on Changbai Mountain in Northeast China
Effects of climate change on biomass carbon sequestration in old-growth forest ecosystems on Changbai Mountain in Northeast China
复制标题
气候变化对东北长白山原始森林生态系统生物量固碳的影响
DOI：
10.1016/j.foreco.2012.06.046
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发表时间：
2013-07-15
影响因子：
3.7
通讯作者：
Jiang, Linhai
中科院分区：
文献类型：
--
作者：
Dai, Limin;Jia, Juan;Jiang, Linhai
原始森林生态系统是巨大的碳库，最近的研究发现，原始森林通常是全球碳汇。然而，气候变化对原始森林生态系统固碳能力的影响尚不确定。结合长白山原始森林30年的固定样地监测和优势木径向生长变化，研究了长白山原始森林生态系统中优势木的净生物量固碳量以及气候变暖对优势木固碳量的影响。结果表明，2010年红松阔叶混交林、云冷杉林和白桦林活木生物量碳密度分别为201.22、106.46和89.49 t ha（-1）。在过去的30年里，KBF和EBF的净生物量碳密度增加，每年净增加1.79 t ha（-1）和1.22 t ha（-1），分别;而SFF的净碳密度下降，每年净减少0.55 t ha（-1）。尽管KBF的碳密度增加，但气候变暖导致1981-2010年期间生物量碳固存减少了0.96 t ha（-1），相当于总林分生物量碳增加的1.8%。KBF净碳密度的增加主要与年龄或大小有关，因为森林仍在成熟。林分密度的降低可能是由于气候引起的林分优势木径向生长衰退和死亡所致。在1981-2010年期间，气候引起的SFF固碳减少为7.30 ha（-1）。森林凋落物中与风有关的树木死亡可能导致林分固碳量减少75.09tha（-1），约为气候变暖引起的10.3倍。在EBF，气候变暖导致林分固碳量略有增加，净碳密度的增加也主要与年龄或大小有关，反映了这一森林仍在成熟的事实。我们的研究还表明，在持续的气候变暖，红松在KBF的优势将下降，水曲柳的优势将增加，这与以前的森林模型的结果是一致的。(c)2012爱思唯尔有限公司版权所有。
Old-growth forest ecosystems are large carbon pools, and recent research has found that old-growth forests generally serve as global carbon sinks. However, the impact of climate change on the capacity for carbon sequestration in old-growth forest ecosystems is uncertain. Combining data from 30-year monitoring of permanent plots with that measuring variations in radial growth of dominant trees in an old-growth forest on Changbai Mountain in Northeast China, this study investigated the net biomass carbon sequestration and the effects of climate warming on carbon sequestration for dominant living trees in this forest ecosystem. The results showed that in 2010 biomass carbon density for living trees was 201.22 t ha(-1) in Korean pine and broad-leaved mixed forest (KBF), 106.46 t ha(-1) in spruce-fir forest (SFF), and 89.49 t ha(-1) in Erman's birch forest (EBF). During the past 30 years the net biomass carbon density has increased in KBF and EBF, with annual net increases of 1.79 t ha(-1) and 1.22 t ha(-1), respectively; while net carbon density has decreased in SFF, with an annual net decrease of 0.55 t ha(-1). Despite the increase of carbon density in KBF, climate warming has contributed to a decrease of 0.96 t ha(-1) in biomass carbon sequestration for the period of 1981-2010, an amount equivalent to 1.8% of total stand biomass carbon increase. The increase in net carbon density in KBF was primarily age- or size-related, since that forest is still maturing. The decreased density in SFF may be caused by climate-induced radial growth decline and mortality of dominant trees in these stands. For the period of 1981-2010, climate-induced decrease of carbon sequestration in SFF was 7.30 ha(-1). Wind-related tree mortality in SFF may have led to the stand carbon sequestration decrease of 75.09 t ha(-1), about 10.3 times that induced by climate warming. In EBF, climate warming has led to a small increase in stand carbon sequestration, and the increase in net carbon density was also primarily age- or size-related, reflecting the fact that this forest is also still maturing. Our study also suggests that the dominance of Korean pine in KBF will decrease and that of Manchurian ash will increase under continuing climate warming, which is in agreement with the results from previous forest models. (c) 2012 Elsevier B.V. All rights reserved.