引用本文:朱浩宇,陆 畅,高 明,黄 容,吕 盛,王子芳.缙云山4种林分土壤植硅体碳分布特征[J].土壤学报,2020,57(2):359-369. DOI:10.11766/trxb201904150631
ZHU Haoyu,LU Chang,GAO Ming,HUANG Rong,LÜ Sheng,WANG Zifang.Distribution of PhytoOC in Soils under Four Different Types of Forest in Jinyun Mountain[J].Acta Pedologica Sinica,2020,57(2):359-369. DOI:10.11766/trxb201904150631
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缙云山4种林分土壤植硅体碳分布特征
朱浩宇, 陆 畅, 高 明, 黄 容, 吕 盛, 王子芳
西南大学资源环境学院
摘要:
森林生态系统中丰富的植硅体可以将部分有机碳封存于土壤中,形成稳定的碳库,对全球碳平衡起到重要作用。以重庆市缙云山的竹林、阔叶林、针叶林和针阔叶混交林4种亚热带森林植被为研究对象,研究不同林分下土壤植硅体及植硅体碳在0~20、20~40、40~60 和 60~100 cm土壤剖面上的分布规律。结果表明,整个土壤剖面(0~100 cm)上,不同林分下竹林土壤有机碳含量和储量、土壤植硅体和植硅体碳含量及植硅体碳储量均最高,显著高于其他3种林分(P<0.05)。4种林分下有机碳和植硅体碳含量呈现一定的表层(0~20 cm)富集现象,并呈现随土层深度增加含量减少的趋势。相关性分析发现,植硅体和植硅体中的有机碳存在显著的负相关关系(P<0.05),而与植硅体碳存在极显著的正相关关系(P<0.01)。缙云山4种林分中,竹林土壤有机碳含量、储量,植硅体、植硅体碳含量、储量均为最高,是较好的富碳森林类型。
关键词:  不同林分  有机碳  植硅体  植硅体碳
基金项目:国家重点研发计划项目(2017YFD0800101)
Distribution of PhytoOC in Soils under Four Different Types of Forest in Jinyun Mountain
ZHU Haoyu,LU Chang,GAO Ming,HUANG Rong,Lü Sheng,WANG Zifang
College of Resource and Environment, Southwest University
Abstract:
【Objective】The abundant phytoliths in the forest ecosystem can seal part of the organic carbon in the soil, thus forming a stable carbon pool, which plays an important role in maintaining global carbon balance.【Method】Four different types of subtropical woodlots, i.e. bamboo forest, broad-leaved forest, coniferous forest and coniferous- and broad-leaved mixed forest, in the Jinyun Mountain of Chongqing were selected as research objects in this study. Distribution of soil phytolith and phytolith carbon in the 0~20, 20~40, 40~60 and 60~100 cm soil layers under the forests was studied.【Result】Results show that the soil profile (0~100 cm) under the bamboo forest was the highest in content and reserves of organic carbon, content and reserves of phytolith and content and reserves of phytolith carbon. Both organic carbon and phytolith carbon tended to concentrate in the topsoil layer (0~20 cm) in all the four types of forest soils and declined in content with soil depth. In terms of average content of soil phytolith-occluded organic carbon in the 0~100 cm soil profile, the four forest soils exhibites an order of bamboo forest (1.96 g•kg-1) > coniferous and broad-leaved mixed forest (0.52 g•kg-1) >coniferous forest (0.33 g•kg-1) > broad-leaved forest(0.28 g•kg-1); the soil phytolith and the phytolith-occluded organic carbon in the bamboo forest were the highest, and significantly higher than their respective ones in the other three forests (P<0.05), and the lowest in the broad-leaved forest. Phytolith carbon showed a trend of surface enrichment in all the four forests. Correlation analysis found that phytolith was significantly and closely related to phytolith-occluded organic carbon (P<0.01), but significantly and negatively related to organic carbon in phytoliths (P<0.05). 【Conclusion】Among the four forest types of forests in the Jinyun Mountain, bamboo forests are the highest in content and storage of soil organic carbon, phytolith, phytolith-occluded organic carbon, and hence a good carbon-rich forest type.
Key words:  Different stand types  Organic carbon  Phytolith  Phytolith-occluded organic carbon