Radiocarbon evidence of the impact of forest-to-plantation conversion on soil organic carbon dynamics on a tropical island
Radiocarbon evidence of the impact of forest-to-plantation conversion on soil organic carbon dynamics on a tropical island
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热带岛屿森林向人工林转变对土壤有机碳动态影响的放射性碳证据
DOI：
10.1016/j.geoderma.2020.114484
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发表时间：
2020
期刊：
影响因子：
6.1
通讯作者：
Jiang Y
中科院分区：
文献类型：
--
作者：
Jiang Y
热带土壤是重要的陆地碳库，具有丰富的生物多样性，对环境变化反应迅速。在全球范围内，近几十年来，不断扩大的天然热带森林转化为人工林，以满足经济需求，显着影响了土壤有机碳（SOC）库的循环，然而，在SOC动态变化的机制知之甚少。在这项研究中，我们研究了SOC动态和土壤微生物群落在5个相邻的热带森林的特点，在过去的几十年中，不同的采伐和种植园的做法，在中国海南岛，通过应用天然丰度放射性碳（14 C）和磷脂脂肪酸（PLFA）分析。在一个>35年的橡胶种植园和一个>50年的桉树种植园，在上30厘米的土壤层中观察到放射性碳丰度的异常下降。这可能是持续的土壤有机质分解后很长一段时间的森林人工林转换，是一致的SOC库存在上30厘米的土壤层在这两个网站显着低于NF。土壤有机碳表观放射性碳年龄和土壤有机碳库存在桉树种植园网站，其中停止耕作20年前是类似的NF，表明恢复过程已经发生。土壤微生物生物量普遍较低，在种植园网站比在NF网站。土壤微生物生物量与上层土壤放射性碳丰度和有机碳含量均呈正相关，表明微生物在有机碳的去向中起着重要作用。还表明，放射性碳可以作为一个强有力的工具，用于评估土壤碳动态的潜在变化，从森林到种植园的转换。
Tropical soils are critical terrestrial carbon reservoirs with abundant biodiversity that respond rapidly to environmental change. Globally, the expanding conversion of natural tropical forest to plantations in recent decades, to meet economic demands, has markedly influenced the cycling of soil organic carbon (SOC) pools; however, the mechanisms underlying the changes in SOC dynamics are poorly understood. In this study, we examined the SOC dynamics and soil microbial communities at five adjacent tropical forest sites characterized by different logging and plantation practices over the past few decades on Hainan Island, China, by applying natural abundance radiocarbon (14C) and phospholipid fatty acid (PLFA) analysis. At a >35-year rubber plantation site and a >50-year eucalyptus plantation site, an abnormal up-profile decrease in radiocarbon abundance was observed in the upper 30 cm soil layer. This could be indicative of continued soil organic matter decomposition long after forest–plantation conversion, and was consistent with the SOC inventories in the upper 30 cm soil layer at the two sites being significantly lower than those of NF. Both the SOC apparent radiocarbon ages and SOC inventory at a eucalyptus plantation site in which tillage was stopped 20 years ago were similar to those of NF, indicating that a recovery process had occurred. The soil microbial biomass was generally lower at the plantation sites than at the NF site. Both the radiocarbon abundance and SOC inventories in the upper 30 cm soil layer showed positive correlations with the soil microbial biomass, suggesting that microbes may have played a key role in the fate of SOC. This study provided evidence that forest–plantation conversion may facilitate the dissimilation of SOC, and also demonstrated that radiocarbon can serve as a powerful tool for assessing the potential changes of soil carbon dynamics resulting from forest-to-plantation conversion.
土壤施肥导致草地施肥实验中微生物群落 δ13C 谱的样本间变异性下降
影响因子：
3.7
作者：
S. Veresoglou;B. Thornton;G. Menexes;A. Mamolos;D. S. Veresoglou
通讯作者：
D. S. Veresoglou
影响因子：
9.7
作者：
Apostel, Carolin;Dippold, Michaela;Kuzyakov, Yakov
通讯作者：
Kuzyakov, Yakov