Soil organic carbon density and its driving factors in forest ecosystems across a northwestern province in China

Abstract Forest soils are an important component of the global carbon cycle, as they sequester and store much more organic carbon than other terrestrial ecosystems. Thus, reliable information on the forest soil organic carbon (SOC), along with the factors that influence it, is crucial from the perspective of regional carbon budgets and climate modeling. Gansu Province in northwestern China is characterized by complex climatic gradients and diverse forest types, suggesting a large variability in the spatial distribution of SOC, yet the SOC stock in this region has not been comprehensively investigated because of insufficient soil profile data. Our study covered the entire forest area in the province via a regional-scale sampling campaign, and provided soil organic carbon density (SOCD) data obtained from 112 natural forests and 100 plantations. Influencing factors including forest type, forest stand age, soil type, litter carbon, climate, and topography were evaluated in both natural forests and plantations. The results indicated a SOC stock of 433.4 ± 13.2 Tg C and a SOCD value of 175.3 ± 33.0 Mg C ha−1 for the 0–100 cm layer at the regional scale. Specifically, the SOC stock and the forest area-weighted average SOCD in natural forests were estimated at 349.0 ± 16.5 Tg C and 207.3 ± 23.2 Mg C ha−1, which were about quadruple and double, respectively, of the values for the plantations. Regardless of natural forests and plantations, SOCD increased with both stand age class and elevation and decreased with mean annual temperature (MAT). SOCD also increased with mean annual precipitation (MAP) for natural forests with elevation

[1]  Lei Deng,et al.  Soil organic carbon storage capacity positively related to forest succession on the Loess Plateau, China , 2013 .

[2]  Shuguang Liu,et al.  Old-Growth Forests Can Accumulate Carbon in Soils , 2006, Science.

[3]  Y. Lü,et al.  Effects of vegetation restoration on soil organic carbon sequestration at multiple scales in semi-ar , 2011 .

[4]  H. Kanomata,et al.  Organic carbon stock in forest soils in Japan , 2004 .

[5]  F. Bravo,et al.  Impact of changes in land use, species and elevation on soil organic carbon and total nitrogen in Ethiopian Central Highlands , 2016 .

[6]  Bo Li,et al.  Ecosystem Carbon Stock Influenced by Plantation Practice: Implications for Planting Forests as a Measure of Climate Change Mitigation , 2010, PloS one.

[7]  Susan E. Trumbore,et al.  Controls over carbon storage and turnover in high‐latitude soils , 2000, Global change biology.

[8]  L. Vesterdal.  Influence of soil type on mass loss and nutrient release from decomposing foliage litter of beech and Norway spruce , 1999 .

[9]  D. F. Grigal,et al.  Soil Productivity Index: Predictions of Site Quality for White Spruce Plantations , 1991 .

[10]  Keryn I. Paul,et al.  Change in soil carbon following afforestation , 2002 .

[11]  Xiaoping Shi,et al.  Storage, pattern and driving factors of soil organic carbon in an ecologically fragile zone of northern China , 2019, Geoderma.

[12]  M. Wiesmeier,et al.  Storage and drivers of organic carbon in forest soils of southeast Germany (Bavaria) - Implications for carbon sequestration , 2013 .

[13]  R. B. Jackson,et al.  THE VERTICAL DISTRIBUTION OF SOIL ORGANIC CARBON AND ITS RELATION TO CLIMATE AND VEGETATION , 2000 .

[14]  Jingyun Fang,et al.  Storage, patterns and environmental controls of soil organic carbon in China , 2007 .

[15]  P. Ciais,et al.  Linking variability in soil solution dissolved organic carbon to climate, soil type, and vegetation type , 2014 .

[16]  Lin Li,et al.  Soil organic carbon in the Sanjiang Plain of China: storage, distribution and controlling factors , 2014 .

[17]  Jingyun Fang,et al.  Increased topsoil carbon stock across China's forests , 2014, Global change biology.

[18]  J. Kopáček,et al.  Carbon pools in a montane old-growth Norway spruce ecosystem in Bohemian Forest: Effects of stand age and elevation , 2015 .

[19]  Xiangyang Sun,et al.  Variations of forest soil organic carbon and its influencing factors in east China , 2016, Annals of Forest Science.

[20]  R. B. Jackson,et al.  A Large and Persistent Carbon Sink in the World’s Forests , 2011, Science.

[21]  R. Gifford,et al.  Soil carbon stocks and land use change: a meta analysis , 2002 .

[22]  R. Lal.  Forest soils and carbon sequestration , 2005 .

[23]  Yun-qiang Wang,et al.  Effect of environmental factors on regional soil organic carbon stocks across the Loess Plateau region, China , 2011 .

[24]  Dongsheng Yu,et al.  Regional patterns of soil organic carbon stocks in China. , 2007, Journal of environmental management.

[25]  M. Hoosbeek,et al.  Soil carbon and nitrogen sequestration over an age sequence of Pinus patula plantations in Zimbabwean Eastern Highlands , 2014 .

[26]  Björn Berg,et al.  Litter decomposition in a transect of Norway spruce forests: substrate quality and climate control , 2000 .

[27]  Gang Liu,et al.  Soil organic carbon stocks in China and changes from 1980s to 2000s , 2007 .

[28]  D. Peterson,et al.  Carbon distribution in subalpine forests and meadows of the Olympic Mountains, Washington , 2000 .

[29]  J. Prietzel,et al.  Organic carbon stocks in forest soils of the German Alps , 2014 .

[30]  Leo Breiman,et al.  Random Forests , 2001, Machine Learning.

[31]  F. Hagedorn,et al.  How strongly can forest management influence soil carbon sequestration , 2007 .

[32]  Zhi-bin He,et al.  Patterns and environmental controls of soil organic carbon and total nitrogen in alpine ecosystems of northwestern China , 2016 .

[33]  Heike Knicker,et al.  How does fire affect the nature and stability of soil organic nitrogen and carbon? A review , 2007 .

[34]  Comparison of soil attributes under Cupressus lusitanica and Eucalyptus saligna established on abandoned farmlands with continuously cropped farmlands and natural forest in Ethiopia , 2004 .

[35]  G. Guggenberger,et al.  Transformation of a Podocarpus falcatus dominated natural forest into a monoculture Eucalyptus globulus plantation at Munesa, Ethiopia: soil organic C, N and S dynamics in primary particle and aggregate-size fractions , 2005 .

[36]  R. B. Jackson,et al.  Shifts in soil organic carbon for plantation and pasture establishment in native forests and grasslands of South America , 2012, Global change biology.

[37]  Carbon stock density in planted versus natural Pinus massoniana forests in sub-tropical China , 2016, Annals of Forest Science.

[38]  Y. Yue,et al.  Biomass and carbon storage in an age-sequence of Cyclobalanopsis glauca plantations in southwest China , 2014 .

[39]  F. Yimer,et al.  Soil organic carbon and total nitrogen stocks as affected by topographic aspect and vegetation in the Bale Mountains, Ethiopia , 2006 .

[40]  Wilfred M. Post,et al.  Soil carbon pools and world life zones , 1982, Nature.

[41]  J. L. Parra,et al.  Very high resolution interpolated climate surfaces for global land areas , 2005 .

[42]  S. Zimmermann,et al.  Kohlenstoff in Schweizer Waldböden – bei Klimaerwärmung eine potenzielle CO2-Quelle | Soil organic carbon in Swiss forest soils – a potential CO2 source in a warming climate , 2010 .

[43]  J. Liski,et al.  Soil carbon stores in Nordic well‐drained forest soils—relationships with climate and texture class , 2003 .

[44]  Philippe Ciais,et al.  The carbon balance of terrestrial ecosystems in China , 2009, Nature.

[45]  K. Otsuki,et al.  The effect of climate on radial growth of Quercus liaotungensis forest trees in Loess Plateau, China , 2007 .

[46]  Forest biomass carbon storage from multiple inventories over the past 30 years in Gansu Province, China: implications from the age structure of major forest types , 2015, Journal of Forestry Research.

[47]  P. Ciais,et al.  Old-growth forests as global carbon sinks , 2008, Nature.

[48]  Wang Hui.  A review of research progress and future prospective of forest soil carbon stock and soil carbon process in China , 2011 .

[49]  H. Miegroet,et al.  Soil organic carbon dynamics along a climatic gradient in a southern Appalachian spruce–fir forest , 2007 .

[50]  R. Lal,et al.  Soil Carbon Sequestration Impacts on Global Climate Change and Food Security , 2004, Science.

[51]  Jinsheng Xie,et al.  Conversion of a natural broad-leafed evergreen forest into pure plantation forests in a subtropical area: Effects on carbon storage , 2005 .

[52]  B. Glaser,et al.  Mathematical modeling of soil carbon turnover in natural Podocarpus forest and Eucalyptus plantation in Ethiopia using compound specific δ13C analysis , 2010 .

[53]  Jonathan Gray,et al.  Drivers of soil organic carbon storage and vertical distribution in Eastern Australia , 2015, Plant and Soil.

[54]  X. Yang,et al.  Spatial Distribution of Soil Organic Carbon and Its Influencing Factors in Desert Grasslands of the Hexi Corridor, Northwest China , 2014, PloS one.

[55]  Martial Bernoux,et al.  Brazil's Soil Carbon Stocks , 2002 .

[56]  Yiqi Luo,et al.  The effects of plantation practice on soil properties based on the comparison between natural and planted forests: a meta-analysis , 2012 .

[57]  E. Díaz-Pinés,et al.  Does tree species composition control soil organic carbon pools in Mediterranean mountain forests , 2011 .

[58]  N. Batjes,et al.  Total carbon and nitrogen in the soils of the world , 1996 .

[59]  J. K. Winjum,et al.  Forest management and carbon storage: An analysis of 12 key forest nations , 1993 .

[60]  M. Olsson,et al.  Soil carbon sequestration under different exotic tree species in the southwestern highlands of Ethiopia , 2006 .

[61]  Keping Ma,et al.  Carbon pools in China’s terrestrial ecosystems: New estimates based on an intensive field survey , 2018, Proceedings of the National Academy of Sciences.

[62]  Thomas H. Painter,et al.  Climatic, edaphic, and biotic controls over storage and turnover of carbon in soils , 1994 .

[63]  Zhou Yu,et al.  CARBON STORAGE AND BUDGET OF MAJOR CHINESE FOREST TYPES , 2000 .