Storage and sequestration potential of topsoil organic carbon in China's paddy soils

Global Change Biology - Tập 10 Số 1 - Trang 79-92 - 2004
Genxing Pan1, Lianqing Li1, Laosheng Wu2, Qian Zhang1
1Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, PRC,
2Department of Environment Sciences, University of California, Riverside, CA 92521, USA

Tóm tắt

AbstractCarbon (C) storage and sequestration in agricultural soils is considered to be an important issue in the study of terrestrial C cycling and global climatic change. The baseline C stock and the C sequestration potential are among the criteria for a region or a state to adopt strategies or policies in response to commitment to the Kyoto Protocol. Paddy soils represent a large portion of global cropland. However, little information on the potential of C sequestration and storage is available for such soils. In this paper, an estimation of the topsoil soil organic carbon (SOC) pool and the sequestration potential of paddy soils in China was made by using the data from the 2nd State Soil Survey carried out during 1979–1982 and from the nationwide arable soil monitoring system established since then. Results showed that the SOC density ranged from 12 to 226 t C ha−1 with an area‐weighted mean density of 44 t C ha−1, which is comparable to that of the US grasslands and is higher than that of the cultivated dryland soils in China and the US. The estimated total topsoil SOC pool is 1.3 Pg, with 0.85 Pg from the upper plow layer and 0.45 Pg from the plowpan layer. This pool size is ∼2% of China's total storage in the top 1 m of the soil profiles and ∼4% of the total topsoil pool, while the area percentage of paddy soil is 3.4% of the total land. The C pool in paddy soils was found predominantly in southeast China geographically and in the subgroups of Fe‐accumulating and Fe‐leaching paddy soils pedogenetically. In comparison with dryland cultivation, irrigation‐based rice cultivation in China has induced significant enrichment of SOC storage (0.3 Pg) in paddy soils. The induced total C sequestration equals half of China's total annual CO2 emission in the 1990s. Estimates using different SOC sequestration scenarios show that the paddy soils of China have an easily attainable SOC sequestration potential of 0.7 Pg under present conditions and may ultimately sequester 3.0 Pg. Soil monitoring data showed that the current C sequestration rate is 12 Tg yr−1. The total C sequestration potential and the current sequestration rate of the paddy soils are over 30%, while the area of the paddy soils is 26% that of China's total croplands. Therefore, practicing sustainable agriculture is urgently needed for enhancing SOC storage to realize the ultimate SOC sequestration of rice‐based agriculture of China, as the current C sequestration rate is significantly lower than the potential rate.

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Tài liệu tham khảo

10.2134/jeq2001.2098

10.1146/annurev.earth.29.1.535

ArrouysD BalesdentJ(2002) Increasing Carbon Stocks in French Agricultural Soils. Scientific Assessment Unit for Expertise INRA.http://www.inra.fr/actualites/rapport‐carbone.html.

10.1111/j.1365-2389.1996.tb01386.x

10.1111/j.1475-2743.2002.tb00248.x

10.2136/sssaj2002.8880

Bhattacharyya T, 2000, Organic carbon stock in Indian soils and their geographical distribution, Current Science, 79, 655

10.1023/A:1019670619316

10.1139/x01-122

Cai Z, 1999, Advances in study of methane emission from rice fields of China, Soils, 5, 266

10.1046/j.1365-2486.2003.00587.x

10.1016/S0378-1127(02)00016-6

Eve MD, 2002, Predicted impact of management changes on soil carbon storage for each cropland region of the conterminous United States, Journal of Soil & Water Conservation, 57, 196

10.1016/S0269-7491(01)00220-2

10.1111/j.1475-2743.2002.tb00236.x

10.1016/S0167-1987(02)00018-1

Gong Z, 1999, Chinese Soil Taxonomic Classification, 5

10.1023/A:1021117029359

10.1016/S0167-1987(02)00113-7

10.1097/00010694-200105000-00003

10.1016/S0167-1987(02)00058-2

10.1023/A:1006238902976

Lal R, 1999, World soils and greenhouse effect, IGBP Global Change Newsletter, 37, 4

Lal R, 2000, Carbon sequestration in drylands, Annals of Arid Zone, 39, 1

Lal R, 2000, Global Climate Change And Tropical Ecosystems, 157

10.1002/ldr.477

10.1002/ldr.531

Li C, 2000, Decrease of soil organic carbon pool, Quaternary Sciences, 20, 345

Li L, 1999, Storage and sequestration of SOC in agricultural soils of Jiangsu, China, Chinese Agronomy Bulletin, 15, 41

Li Q, 1992, Paddy Soils of China, 232

10.1023/A:1010356828990

10.1023/A:1010350020951

10.1097/00010694-199605000-00007

MarlandG BodenTA(1999)Global regional and national CO2emissions. Trends: A Compendium of Data and Global Change. Carbon Dioxide Information Analysis Center National Laboratory Oak Ridge TN USA.

10.1023/A:1010728609701

Pan G, 2000, SOC storage and distribution in depth and size fractions of aggregates of paddy soils from the Tai Lake region, China, Bulletin of Science and Technology, 16, 421

Pan G, 2003, Soil organic carbon storage of China and the sequestration dynamics in agricultural lands, Advances in Earth Sciences, 18, 609

10.1023/A:1005597216804

Rustad LE, 2001, Meta‐analysis of the response of soil respiration, net nitrogen mineralization, and aboveground plant growth to experimental ecosystem warming, Oecologia, 26, 543, 10.1007/s004420000544

10.1016/S0269-7491(01)00215-9

10.1097/00010694-200203000-00004

10.1111/j.1475-2743.2000.tb00214.x

10.1046/j.1365-2486.1997.00055.x

10.1046/j.1365-2486.2000.00331.x

10.1029/2000GB001341

Soil Survey Service of Jiangsu (SSSJ), 1995, Soils of Jiangsu, 232

10.1023/A:1022888832630

State Extension Service of Agricultural Technology of China (SESATC), 2003, State‐wide Soil Monitoring of Arable Lands (Selected Works)

State Soil Survey Service of China (SSSSC), 1993, China Soil Series.

SSSSC, 1994, China Soil Series

SSSSC, 1994, China Soil Series

SSSSC, 1995, China Soil Series

SSSSC, 1995, China Soil Series

SSSSC, 1996, China Soil Series

SSSSC, 1996, Soil Survey Technical Report, 50

SSSSC, 1997, China Soil Survey Database, 35

10.1080/03014223.1997.9517541

Titlyanova AA, 1995, Organic carbon pools in the soils of western Siberia, Eurasian Soil Science, 27, 14

10.1300/J064v18n01_09

10.1046/j.1365-2486.2002.00485.x

10.1016/S0167-1987(02)00116-2

Wang SQ, 1999, Estimate of organic carbon pool of terrestrial soils of China, Geographical Science, 18, 349

10.1080/014311602753590887

10.1016/S0269-7491(01)00269-X

10.1016/S0167-8809(01)00233-X

10.1046/j.1365-2486.2003.00590.x

10.2136/sssaj1995.03615995005900060025x

Zhao QG, 2002, Elemental Cyclings in Red Soils Ecosystems and the Regulations, 26

10.1023/A:1009779724374

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Thông tin xuất bản

Global Change Biology

Tập 10 Số 1

79-92

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