摘要【目的】全球气候变化的背景下,森林土壤在陆地生态系统碳平衡和碳固存中起着越来越重要的作用,而次生演替是森林土壤有机碳库变化的重要驱动因素。【方法】本文以长白山原始阔叶红松林和杨桦次生林为例,通过严格的样地对比途径,研究了两种林型土壤中有机碳库大小及其剖面分布差异,旨在探讨次生演替对温带森林土壤碳源汇效应的影响及机制。【结果】杨桦次生林比原始阔叶红松林在表层和亚表层(0 ~ 20 cm)土壤积累了更多的有机碳,而在深层土壤中有机碳含量和密度无显著差异,表明林型或次生演替对土壤有机碳库的影响仅限于表层和亚表层。两种林型5 ~ 10 cm 与0 ~ 5 cm 土层、10 ~ 20 cm 与5 ~ 10 cm 土层有机碳含量均表现为显著正相关,但杨桦次生林上部土层对下部土层的决定系数(R2)明显高于阔叶红松林,即杨桦次生林上部土层有机碳含量对下部土层的影响比原始阔叶红松林更明显。【结论】土壤动物活动和土壤环境改变所致根系分布变化可能是次生演替引起土壤有机碳库变化的重要原因;次生演替过程中土壤有机碳库变化的主要驱动机制尚有待研究。
李斯雯,赵华晨,高 菲,高 雷,王明哲,崔晓阳. 长白山两种森林类型土壤有机碳库及其剖面分布特征[J]. 温带林业研究, 2019, 2(2): 7-10.
HUI Gang-ying,WANG Hong-xiang. Soil Organic Carbon Pools and Profile Distribution under Broad-Leaved Korean
Pine Forest and Betula platyphylla Secondary Forest in Changbai Mountain. 温带林业研究, 2019, 2(2): 7-10.
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