DOI: 10.1016/j.foreco.2014.01.003
Scopus记录号: 2-s2.0-84893596447
论文题名: Digital soil mapping of soil organic carbon stocks under different land use and land cover types in montane ecosystems, Eastern Himalayas
作者: Dorji T. ; Odeh I.O.A. ; Field D.J. ; Baillie I.C.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 318 起始页码: 91
结束页码: 102
语种: 英语
英文关键词: Digital soil mapping
; Himalayas
; Land use
; Regression kriging
; SOC stocks
; Soil organic carbon
英文摘要: Quantification of soil organic carbon (SOC) stocks is quite useful for accurate monitoring of C sequestration. However, there are still substantial gaps in our knowledge of SOC stocks in many parts of the world, including the Himalayas. We investigated the total SOC stocks and its spatial distribution under different land use and land cover (LULC) types in montane ecosystems of Bhutan. 186 Soil profiles were described and sampled by genetic horizons at sites located using conditioned Latin hypercube sampling. SOC concentrations at the standard depths designated for the GlobalSoilMap.Net were estimated with an equal-area spline profile function. SOC concentrations at these depth intervals were digitally mapped to a fine resolution matrix of 90m grid using regression kriging. We found significant influence of LULC categories on SOC concentration, SOC density, SOC stocks and their spatial distributions, although this influence decreased with increasing soil depth. The estimated mean SOC density in the top 1m were highest in fir forest soils (41.4kgm-2) and lowest in paddy land (12.0kgm-2). Allowing for LULC relative areas, mixed conifer forest had the highest SOC stocks in the upper meter (12.4Mt) with orchards the lowest (0.1Mt). The total SOC stocks for the whole study area for the 0-5, 5-15, 15-30, 30-60 and 60-100cm depths were 2.6, 5.0, 6.5, 7.5 and 5.4Mt, respectively. The overall SOC stock of the study area for the upper meter was approximately 27.1Mt. The combined forests accounted for more than 77.5% of the total SOC stocks of the study area. This and the relative SOC densities indicate that the conversion of even a fraction of forests to other LULC types could lead to substantial loss of SOC stocks. This loss of SOC stock is even greater when the decrease in aboveground biomass is also taken into consideration. However, appropriate management of the agricultural lands could increase their sequestration of atmospheric CO2. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66078
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Environmental Sciences, Faculty of Agriculture and Environment, The University of Sydney, Australian Technology Park, Biomedical Building C81, Central Avenue, Eveleigh, NSW 2015, Australia; National Soil Resources Institute, Cranfield University, MK45 4DT England, United Kingdom
Recommended Citation:
Dorji T.,Odeh I.O.A.,Field D.J.,et al. Digital soil mapping of soil organic carbon stocks under different land use and land cover types in montane ecosystems, Eastern Himalayas[J]. Forest Ecology and Management,2014-01-01,318