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Total carbon and nitrogen stocks under different land use/land cover types in the Southwestern region of Nigeria
Geoderma Regional ( IF 4.1 ) Pub Date : 2020-08-05 , DOI: 10.1016/j.geodrs.2020.e00320
Idowu Ezekiel Olorunfemi , Johnson Toyin Fasinmirin , Ayorinde Akinlabi Olufayo , Akinola Adesuji Komolafe

Land use systems play a vital role in the storage of soil total nitrogen (STN) and terrestrial carbon stocks and offset of the atmospheric CO2 concentration. In this study, we estimated the overall-ecosystem carbon stocks under different land cover types in some parts of Southwestern Nigeria, sub-Saharan Africa (SSA). Soil carbon and total nitrogen concentrations were measured at 0–10, 10–20 and 20–30 cm soil depths for four land covers (forests (FOR), plantations (TP), woodlands (WD) and croplands (CP)). The aboveground biomass carbon (Mg C ha−1) followed the order: FOR (118.19 Mg C ha−1) > TP (64.57 Mg C ha−1) > WD (31.09 Mg C ha−1) > CP (17.31 Mg C ha−1). Soil organic carbon (SOC) and STN concentration in all land uses decreased significantly (p < 0.05) with depth increment. Total SOC stock in 0–30 cm soil layer follows the order: FOR land use (93.62 Mg C ha−1) > TP (60.87 Mg C ha−1) > WD (55.21 Mg C ha−1) > CP (50.23 Mg C ha−1). The majority of carbon stocks in our study area were concentrated in the aboveground and soil carbon pool. Overall, the total carbon stock (TCS) of FOR was 163.67 Mg C ha−1, 152.86 Mg C ha−1 and 107.98 Mg C ha−1, respectively, greater than that of CP, WD and TP, respectively. This result indicated that forests stored larger amount of TCS compared to croplands and woodlands. As such, agroforestry, forest plantations and forestry should be given serious considerations as strategies to sequester carbon. Land use management practices and disturbance history are major factors impacting changes in carbon storage among land use systems. Improved knowledge of these and their spatial and temporal variability is very important in understanding the global change in soil carbon stocks and in enhancing human capacity to implement mitigation and adaptation strategies.



中文翻译:

尼日利亚西南地区不同土地利用/土地覆被类型下的总碳和氮储量

土地利用系统在土壤总氮(STN)和陆地碳储量的存储以及大气CO 2浓度的抵消中起着至关重要的作用。在这项研究中,我们估算了尼日利亚西南部,撒哈拉以南非洲(SSA)某些地区不同土地覆被类型下的整体生态系统碳储量。在四个土地覆被(森林(FOR),种植园(TP),林地(WD)和农田(CP))的土壤深度0-10、10-20和20-30 cm处测量了土壤碳和总氮浓度。地上生物质碳(Mg C ha -1)的顺序为:FOR(118.19 Mg C ha -1)> TP(64.57 Mg C ha -1)> WD(31.09 Mg C ha -1)> CP(17.31 Mg C ha -1)。 随着深度的增加,所有土地利用中的土壤有机碳(SOC)和STN浓度均显着下降(p <0.05)。0–30厘米土壤层中的总SOC储量遵循以下顺序:土地利用(93.62 Mg C ha -1)> TP(60.87 Mg C ha -1)> WD(55.21 Mg C ha -1)> CP(50.23 Mg C ha -1)。我们研究区的大部分碳储量都集中在地上和土壤碳库中。总体而言,总碳库存(TCS)FOR的是163.67镁Ç公顷-1,152.86镁Ç公顷-1和107.98镁Ç公顷-1分别大于CP,WD和TP。该结果表明,与农田和林地相比,森林存储的TCS量更大。因此,应认真考虑农林业,人工林和林业作为固碳的策略。土地利用管理实践和干扰历史是影响土地利用系统之间碳储存变化的主要因素。对这些知识及其时空变异性的了解不断提高,对于理解土壤碳储量的全球变化以及增强人类实施缓解和适应战略的能力非常重要。

更新日期:2020-08-05
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