Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s10705-007-9116-4 |
Temporal and spatial trends in soil organic carbon stocks following maize cultivation in semi-arid Tanzania, East Africa | |
Birch-Thomsen, Torben; Elberling, Bo; Fog, Bjarne; Magid, Jakob | |
通讯作者 | Birch-Thomsen, Torben |
来源期刊 | NUTRIENT CYCLING IN AGROECOSYSTEMS
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ISSN | 1385-1314 |
EISSN | 1573-0867 |
出版年 | 2007 |
卷号 | 79期号:3页码:291-302 |
英文摘要 | Conversion of native ecosystems to agro-ecosystems influences the amount, quality and turnover of soil organic carbon (SOC). As most agro-ecosystems are not in a steady state in terms of the content of SOC, the time scale and feedback mechanisms of changes in SOC are highly relevant for predicting future soil fertility and potential rates of soil carbon losses or sequestration. This paper focuses on changes in land use linked to measured changes in the distribution of total stocks of SOC and the delta C-13 signature in the upper 0.5 m of cultivated soils in the semi-arid parts of Tanzania. Based on documented land use changes since 1950s using remote sensing data, 12 sampling sites along two transects were selected to represent semi-natural/natural savannah and maize fields cultivated for up to five decades. Comparisons between sites representing a chronosequence of well-drained soils showed that soils cultivated the last 50 years have in average less than 50% SOC compared to soils which have never been cultivated. Variations between sites were significant and a reduction in SOC could not be established at sites near present or former villages which have received substantial manure despite a long cultivation history or along a chronosequence representing wetter and more fine-grained soils. Spatial variations in land use changes were parameterized based on remote sensing data and successfully validated against sampling sites. Site-specific rates of soil element loss following cultivation were extrapolated to the study area and uncertainties related to scaling up were discussed. |
英文关键词 | soil organic carbon Tanzania land use changes agriculture |
类型 | Article |
语种 | 英语 |
国家 | Denmark |
收录类别 | SCI-E |
WOS记录号 | WOS:000249919600008 |
WOS关键词 | PARTICLE-SIZE FRACTIONS ; NATURAL C-13 ABUNDANCE ; MATTER DYNAMICS ; LAND-USE ; MANAGEMENT ; SEQUESTRATION |
WOS类目 | Soil Science |
WOS研究方向 | Agriculture |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/155535 |
作者单位 | (1)Univ Copenhagen, Dept Geog & Geol, DK-1350 Copenhagen, Denmark;(2)Univ Copenhagen, Fac Life Sci, Dept Agr Sci, DK-1871 Frederiksberg C, Denmark |
推荐引用方式 GB/T 7714 | Birch-Thomsen, Torben,Elberling, Bo,Fog, Bjarne,et al. Temporal and spatial trends in soil organic carbon stocks following maize cultivation in semi-arid Tanzania, East Africa[J],2007,79(3):291-302. |
APA | Birch-Thomsen, Torben,Elberling, Bo,Fog, Bjarne,&Magid, Jakob.(2007).Temporal and spatial trends in soil organic carbon stocks following maize cultivation in semi-arid Tanzania, East Africa.NUTRIENT CYCLING IN AGROECOSYSTEMS,79(3),291-302. |
MLA | Birch-Thomsen, Torben,et al."Temporal and spatial trends in soil organic carbon stocks following maize cultivation in semi-arid Tanzania, East Africa".NUTRIENT CYCLING IN AGROECOSYSTEMS 79.3(2007):291-302. |
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