Humic Substances and Mineral-Associated Soil Organic Carbon As Influenced By Land Use in Southeastern Adamawa State, Nigeria
Humic Substances and Mineral-Associated Soil Organic Carbon As Influenced By Land Use in Southeastern Adamawa State, Nigeria
复制标题
尼日利亚阿达马瓦州东南部土地利用对腐殖质和矿物相关土壤有机碳的影响
DOI：
10.9790/2402-0655970
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
D. Oke
中科院分区：
文献类型：
--
作者：
G. Y. Jamala;D. Oke
土地利用管理已被观察到影响不稳定，稳定和腐殖化土壤有机质组分，但这些变化的幅度还没有建立在几内亚南部稀树草原的阿达马瓦州，东北部尼日利亚。本研究调查了五种土地利用管理系统（未受干扰的天然林、耕地、放牧保护区、种植园和休闲地）对土壤腐殖物质和矿物相关有机碳状况的影响。在每个研究地点切割3条100 m的样带，并沿每条样带沿着以50 m间隔交替放置4块20 m × 20 m的样地。使用直径为3cm的土钻，在0-15、15-30、30-45和45-60 cm的深度对角采集土芯样品，并在每个地块的三个点采集土芯样品。这些结果表明，矿物相关的和腐殖化的有机质在天然林，种植园和放牧保护区得到更好的保护，因此不容易受到矿化。研究表明，七年的休闲对土壤有机碳的贡献是最小的。这可能归因于若干因素，如放牧、每年焚烧灌木和砍伐植被作为薪柴。土壤稳定性有机碳与土壤各养分之间存在正相关关系。这表明，土壤有机碳的有效性在一定程度上取决于矿物结合态有机碳的状况。土壤腐殖酸含量受土地利用方式和土壤深度的影响显着。土壤表层（0-15 cm）腐殖酸含量以种植园林最高（17.42 g/kg），其次为天然林（15.16 g/kg）、放牧地（14.16 g/kg）和休闲地（12.31 g/kg）。富里酸含量也遵循与腐殖酸相同的模式。表层（0-15 cm）土壤矿物结合有机碳含量最高的是种植园和天然林（分别为1.19和1.15），其次是放牧保护区（1.12）。耕地和休闲地分别为0.95和0.87。在尼日利亚阿达马瓦州的南几内亚稀树草原土壤中，不同土地利用类型的土壤总的、颗粒的、矿物相关的有机碳和腐殖物质的储存潜力存在差异。结果表明，天然林、种植园和放牧保护区具有一定的有机碳储量。这一结果为实施有利于固碳和改善土壤质量的耕作做法（如免耕）提供了宝贵的信息。
Land use management has been observed to affect labile, stable and humified soil organic matter fractions, but the magnitude of these changes has not been established in the Southern Guinea savanna of Adamawa State, northeastern Nigeria. The study investigated effects of five land use management systems (undisturbed natural forest, crop land, grazing reserve, forest plantation and fallow land) on the status of humic substances and mineral-associated soil organic carbon. Three transects that are 100 m apart were cut in each of the study site and four sampling plots of 20 m × 20 m in dimension were laid in alternate positions along each transect at 50 m interval. Soil core samples were collected diagonally at a depth of 0-15, 15-30, 30-45 and 45-60 cm and at three points in each plot using a 3cm diameter soil auger. These results showed that both mineral-associated and humified organic matter are better protected under natural forest, plantation and grazing reserve and consequently less vulnerable to mineralization. The study revealed that seven years fallow contribution to soil organic carbon was minimal. This might be attributed to several factors such as livestock grazing, incidence of annual bush burning and cutting of vegetation for fuel wood. The relationship between stable soil organic carbon and various soil nutrients indicates that positive correlation exists. This shows that availability of humic, fulvic acid, exchangeable magnesium, exchangeable calcium, total phosphorus, cation exchange capacity and total nitrogen depend to some extent on the status of mineral-associated soil organic carbon. The content of humic was significantly influenced by land use and soil depth. Highest humic acid content (17.42 g/kg) was recorded under plantation in the soil surface layer (0-15 cm), followed by natural forest (15.16 g/kg), grazing reserve (14.16 g/kg), and fallow land (12.31 g/kg). The fulvic acid content also followed the same pattern as obtained for humic acid. The highest %mineral associated soil organic carbon was recorded for plantation and natural forest at the surface layer (0-15 cm) (1.19 and 1.15 respectively), followed by the grazing reserve (1.12). The crop land and the fallow land recorded 0.95 and 0.87 respectively. There exist differences across land use types in their potentials of storing total, particulate, mineral-associated organic carbon and humic substances in the Southern Guinea Savanna soils of Adamawa State, Nigeria. From the results it was noted that, natural forest, plantation and grazing reserve had potentials for storing organic carbon of appreciable concentration. This result provides valuable information for implementing tillage practices (such as zero tillage) that can favour carbon sequestration and improve soil quality.
DOI：
10.5860/choice.27-5759
发表时间：
1989-12
期刊：
--
影响因子：
--
作者：
D. Coleman;J. Oades;G. Uehara
通讯作者：
D. Coleman;J. Oades;G. Uehara