Estimation of total fine root production using continuous inflow methods in tropical mangrove forest on Pohnpei Island, Micronesia: Fine root necromass accumulation is a substantial contributor to blue carbon stocks
Estimation of total fine root production using continuous inflow methods in tropical mangrove forest on Pohnpei Island, Micronesia: Fine root necromass accumulation is a substantial contributor to blue carbon stocks
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使用连续流入法估算密克罗尼西亚波纳佩岛热带红树林的细根总产量：细根坏死物积累是蓝碳储量的重要贡献者
DOI：
10.1111/1440-1703.12280
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发表时间：
2021
影响因子：
2
通讯作者：
et al
中科院分区：
文献类型：
--
作者：
Kenji Ono; Ryuichi Tabuchi;Shingo Taniguchi;et al
细根分解、死亡和生产是红树林生态系统地下碳动态的基本组成部分。红树林是一种高生产力的生态系统，具有巨大的碳储量;然而，关于红树林土壤中沉水细根动态的信息是有限的。估计细根生产在几个网站的红树林社区的波恩佩岛，密克罗尼西亚，我们估计连续流入使用一个简单的质量平衡模型结合联合收割机向内生长的核心和垃圾袋实验结果。根据我们的研究结果，之前报道的红树林细根生产值被严重低估，因为实验期间忽视了细根分解过程。我们估计，0.3 m深处的细根年产量从13.8（木榄在向陆地的地块）到56.3 Mg ha− 1年−1（B）不等。在向海的地块中的裸地）。然而，将细根产量与样品树中单位茎横截面积增加进行比较，Rhizophoraspp.比其他物种都要大。细根的年死亡率和分解率分别为年生产量的70%~ 105%和11%~ 52%。这里估计的细根年产量远远高于以前报道的。这些发现开始量化高生产力的红树林细根固碳的贡献和重要性的蓝碳生态系统。本研究为红树林植被演替过程中红树林土壤有机碳的动态变化提供了新的认识。
Fine root decomposition, mortality, and production are fundamental components of belowground carbon dynamics in mangrove ecosystems. Mangroves are highly productive ecosystems with huge carbon stocks; however, information on the dynamics of submerged fine roots in mangrove soils is limited. To estimate fine root production in several sites of mangrove communities on Pohnpei Island, Micronesia, we estimated continuous inflows using a simple mass balance model to combine ingrowth core and litterbag experimental results. According to our findings, previously reported mangrove fine root production values were severely underestimated because the fine root decomposition process was disregarded during the experimental period. We estimated that annual fine root production up to 0.3 m in depth ranged from 13.8 (Bruguiera gymnorrhizain a landward plot) to 56.3 Mg ha−1year−1(B. gymnorrhizain a seaward plot). However, comparing the fine root production with respect to the unit of stem cross‐section area increase in the sample tree, the fine root production ofRhizophoraspp. was greater than that of other species. The annual fine root mortality and decomposition to annual fine root production was 70%–105% and 11%–52% of annual production, respectively. The annual fine root production estimated here was much higher than that previously reported. These findings begin to quantify the contribution and importance of highly productive mangrove fine roots for carbon sequestration in blue carbon ecosystems. Moreover, this study provides new insights into the organic carbon dynamics in mangrove soils with mangrove vegetation succession.