Organic Carbon Dynamics in Different Soil Types After Conversion of Forest to Agriculture

Land Degradation and Development - Tập 26 Số 3 - Trang 272-283 - 2015
Thilde Bech Bruun1, Bo Elberling2, Andreas de Neergaard1, Jakob Magid1
1Department of Plant and Environmental Sciences, University of Copenhagen, 1871, Frederiksberg C, Denmark
2University of Copenhagen; Department of Geosciences and Natural Resource Management

Tóm tắt

AbstractState‐of‐the‐art predictive models of soil organic carbon (SOC) dynamics associated with land use changes are unable to reflect the diversity of tropical soil types as the knowledge of contrasting site‐specific factors in mediating the response of the SOC pool is sparse. This paper examines the influence of soil type and management on SOC dynamics following the conversion of forests to annual cropping in Ghana. Soil from primary forests and from areas with short (2–7 years) and long (20 years) histories of maize cultivation was sampled from a Vertisol dominated by smectite and Ultisol dominated by kaolinite. Wet sieving was used to separate soil fractions below and above 250 µm. SOC concentrations and δ13C signatures of SOC in soil fractions and bulk soil were determined. SOC stocks were calculated by the commonly used fixed depth approach and by the equivalent soil mass approach. After 20 years of cultivation of the Vertisol, the total SOC content was 40 per cent lower than under forest, and about 95 per cent of the forest‐derived SOC had been lost. After 20 years of cultivation of the Ultisol, total SOC content was only about 20 per cent lower than under forest and merely 30 per cent of the forest‐derived SOC had been lost. Both soil types were managed as they would typically be in small scale farming systems, thus the higher SOC losses and the substantial loss of forest‐derived SOC from the Vertisol question the conventional concept of smectite having a higher SOC‐stabilizing potential than kaolinite under field conditions. Copyright © 2013 John Wiley & Sons, Ltd.

Từ khóa


Tài liệu tham khảo

AduSV.1992.Soils of the Kumasi region Ashanti Region Ghana. Ghana Ministry of Food and Agriculture Services Division. Soil and Land‐use Survey Branch. Memoir 8: Kumasi.

10.1016/S0166-2481(96)80012-2

10.2136/sssaj2005.0216

10.1016/j.agee.2009.01.013

10.1016/S0146-6380(00)00049-8

10.1016/j.geoderma.2006.10.006

BerhanuD.1982.Detailed soil survey and land suitability evaluation of Holetta Agricultural Research Station.Soil survey and land evaluation report No 2. Institute of Agricultural Research: Adis Ababa.

10.1007/s10705-007-9116-4

BrammerH.1955.Detailed soil survey of the Kpong pilot irrigation area. Gold Coast Department of Soil and Land‐Use Survey Kumasi: Kumasi Ghana.

Bremner JM, 1996, Methods of soil analysis, Part 3 ‐ Chemical Methods, 1087

10.1016/j.soilbio.2010.01.009

10.1016/j.agee.2005.09.012

10.1007/s10745-009-9257-y

10.1016/0016-7061(94)00080-T

10.1046/j.1365-2389.2001.00417.x

Dalal RC, 1986, Long‐term trends in fertility of soils under continuous cultivation and cereal cropping in southern Queensland. II Total organic Carbon and its rate of loss from the soil profile, Australian Journal of Agricultural Research, 24, 281

10.1007/BF00000786

10.1007/BF02186966

Dudal R, 1988, Vertisols: Their distribution, properties, classification and management, 1

Ellert BH, 2001, Assessment Methods for Soil Carbon, 131

10.1016/S0016-7061(97)00039-6

10.2136/sssaj2003.1715

10.1111/j.1744-7348.2001.tb00090.x

10.1890/1051-0761(2000)010[0423:TVDOSO]2.0.CO;2

10.1016/S0146-6380(00)00042-5

10.1016/j.geoderma.2004.01.032

10.1002/ldr.696

10.1079/PAVSNNR20083030

10.1016/S0038-0717(02)00069-X

10.1111/j.1365-2389.2010.01247.x

10.1002/ldr.419

10.1079/9780851994505.0129

Nye PH, 1960, Technical Communication

10.1007/BF01373877

10.1046/j.1365-2486.2000.00308.x

10.1111/j.1365-2486.2004.00736.x

10.1007/BF00017672

10.1016/S0038-0717(96)00250-7

10.1023/A:1006247623877

10.1071/SR99138

10.1079/9780851994505.0000

Thomas GW, 1996, Methods of Soil Analysis, Part 3, Chemical Methods

10.1016/S0016-7061(97)00042-6

10.1016/j.soilbio.2007.03.007

10.2136/sssaj2004.1540

10.1046/j.1365-2389.2003.00512.x

10.1016/S0016-7061(00)00062-8

10.1016/S0166-2481(96)80010-9

10.1016/S0016-7061(97)00040-2

Thông tin
Thông tin xuất bản

Land Degradation and Development

Tập 26 Số 3

272-283

Thông tin tác giả