Towards an ecosystem capacity to stabilise organic carbon in soils

被引:14
作者
Poeplau, Christopher [1 ]
Dechow, Rene [1 ]
Begill, Neha [1 ]
Don, Axel [1 ]
机构
[1] Thunen Inst Climate Smart Agr, Bundesallee 68, D-38116 Braunschweig, Germany
关键词
mineral associated organic carbon; mineralogical capacity; net primary production; RothC; soil organic carbon; SOM fractionation; MATTER; CLAY; DECOMPOSITION; MANAGEMENT; GERMANY; MODELS;
D O I
10.1111/gcb.17453
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
Soil organic carbon (SOC) accrual, and particularly the formation of fine fraction carbon (OCfine), has a large potential to act as sink for atmospheric CO2. For reliable estimates of this potential and efficient policy advice, the major limiting factors for OCfine accrual need to be understood. The upper boundary of the correlation between fine mineral particles (silt + clay) and OCfine is widely used to estimate the maximum mineralogical capacity of soils to store OCfine, suggesting that mineral surfaces get C saturated. Using a dataset covering the temperate zone and partly other climates on OCfine contents and a SOC turnover model, we provide two independent lines of evidence, that this empirical upper boundary does not indicate C saturation. Firstly, the C loading of the silt + clay fraction was found to strongly exceed previous saturation estimates in coarse-textured soils, which raises the question of why this is not observed in fine-textured soils. Secondly, a subsequent modelling exercise revealed, that for 74% of all investigated soils, local net primary production (NPP) would not be sufficient to reach a C loading of 80 g C kg-1 silt + clay, which was previously assumed to be a general C saturation point. The proportion of soils with potentially enough NPP to reach that point decreased strongly with increasing silt + clay content. High C loadings can thus hardly be reached in more fine-textured soils, even if all NPP would be available as C input. As a pragmatic approach, we introduced texture-dependent, empirical maximum C loadings of the fine fraction, that decreased from 160 g kg-1 in coarse to 75 g kg-1 in most fine-textured soils. We conclude that OCfine accrual in soils is mainly limited by C inputs and is strongly modulated by texture, mineralogy, climate and other site properties, which could be formulated as an ecosystem capacity to stabilise SOC. This article provides evidence, that the stabilisation of carbon in soils is primarily limited by carbon inputs. Using a large, temperate-zone centred dataset, and a well-established carbon model, we show that the empirical upper limit of carbon associated with silt and clay particles does not resemble a maximum mineralogical capacity. Without the given natural limitations of net primary production and C input limitation, soils could most likely stabilise and store much more soil carbon than commonly observed.image
引用
收藏
页数:13
相关论文
共 50 条
[41]   Roles of soil organic carbon and iron oxides on aggregate formation and stability in two paddy soils [J].
Xue, Bin ;
Huang, Li ;
Huang, Yanan ;
Zhou, Fangliang ;
Li, Feng ;
Kubar, Kashif Ali ;
Li, Xiaokun ;
Lu, Jianwei ;
Zhu, Jun .
SOIL & TILLAGE RESEARCH, 2019, 187 :161-171
[42]   Stocks of organic carbon in Estonian soils [J].
Kolli, Raimo ;
Ellermaee, Olav ;
Koester, Tiina ;
Lemetti, Illar ;
Asi, Endla ;
Kauer, Karin .
ESTONIAN JOURNAL OF EARTH SCIENCES, 2009, 58 (02) :95-108
[43]   Controls on dissolved organic carbon export through surface runoff from loamy agricultural soils [J].
Van Gaelen, Nele ;
Verschoren, Veerle ;
Clymans, Wim ;
Poesen, Jean ;
Govers, Gerard ;
Vanderborght, Jan ;
Diels, Jan .
GEODERMA, 2014, 226 :387-396
[44]   Organic carbon stocks and sequestration rates of forest soils in Germany [J].
Grueneberg, Erik ;
Ziche, Daniel ;
Wellbrock, Nicole .
GLOBAL CHANGE BIOLOGY, 2014, 20 (08) :2644-2662
[45]   Soil Organic Carbon in Mid-Atlantic Region Forest Soils: Stocks and Vertical Distribution [J].
Colopietro, Daniel J. ;
Weil, Ray R. .
FORESTS, 2024, 15 (07)
[46]   Organic carbon stocks in grassland soils and their spatial distribution in Japan [J].
Matsuura, Shoji ;
Sasaki, Hiroyuki ;
Kohyama, Kazunori .
GRASSLAND SCIENCE, 2012, 58 (02) :79-93
[47]   The centennial legacy of land-use change on organic carbon stocks of German agricultural soils [J].
Emde, David ;
Poeplau, Christopher ;
Don, Axel ;
Heilek, Stefan ;
Schneider, Florian .
GLOBAL CHANGE BIOLOGY, 2024, 30 (08)
[48]   Soil Organic Carbon Pools in Benchmark Soils of Punjab, Pakistan [J].
Yousra, Munazza ;
Hussain, Qaiser ;
Khan, Khalid Saifullah ;
Ansar, Muhammad ;
Sarwar, Sair ;
Khan, Muhammad Zameer .
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS, 2023, 54 (05) :571-585
[49]   Dealing with soil organic carbon modeling: some insights from an agro-ecosystem in Northeast Iran [J].
Keshavarzi, Ali ;
Tuffour, Henry Oppong ;
Oppong, Jimmy Clifford ;
Zeraatpisheh, Mojtaba ;
Kumar, Vinod .
EARTH SCIENCE INFORMATICS, 2021, 14 (04) :1833-1845
[50]   Soil Properties and Organic Carbon Stock of Soils under Arid Coastal Ecosystem Oasis in Southern East of Tunisia [J].
Bouajila, A. ;
Omar, Z. ;
Essayeh, W. ;
Brahim, N. .
ARID ECOSYSTEMS, 2023, 13 (02) :167-179