Estimating the organic carbon stabilisation capacity and saturation deficit of soils: a New Zealand case study

被引:114
作者
Beare, M. H. [1 ]
McNeill, S. J. [2 ]
Curtin, D. [1 ]
Parfitt, R. L. [2 ]
Jones, H. S. [3 ]
Dodd, M. B. [4 ]
Sharp, J. [1 ]
机构
[1] New Zealand Inst Plant & Food Res Ltd, Sustainable Prod Portfolio, Christchurch 8140, New Zealand
[2] Landcare Res, Palmerston North, New Zealand
[3] Scion, Rotorua 3046, New Zealand
[4] AgResearch Ltd, Grasslands Res Ctr, Palmerston North, New Zealand
关键词
Soil organic carbon; Soil carbon stabilisation; Soil carbon saturation deficit; Fine mineral particles; Quantile regression; PARTICLE-SIZE FRACTIONS; MINERAL SURFACES; BOUNDARY-LINE; DEPTH FUNCTIONS; CLAY FRACTIONS; MATTER; TEXTURE; TURNOVER; DYNAMICS; AREA;
D O I
10.1007/s10533-014-9982-1
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The capacity of a soil to sequester organic carbon can, in theory, be estimated as the difference between the existing soil organic C (SOC) concentration and the SOC saturation value. The C saturation concept assumes that each soil has a maximum SOC storage capacity, which is primarily determined by the characteristics of the fine mineral fraction (i.e. < 20 A mu m clay + fine silt fraction). Previous studies have focussed on the mass of fine fractions as a predictor of soil C stabilisation capacity. Our objective was to compare single- and multi-variable statistical approaches for estimating the upper limit of C stabilisation based on measureable properties of the fine mineral fraction [e.g. fine fraction mass and surface area (SA), aluminium (Al), iron (Fe), pH] using data from New Zealand's National Soils Database. Total SOC ranged from 0.65 to 138 mg C g(-1), median values being 44.4 mg C g(-1) at 0-15 cm depth and 20.5 mg C g(-1) at 15-30 cm depth. Results showed that SA of mineral particles was more closely correlated with the SOC content of the fine fraction than was the mass proportion of the fine fraction, indicating that it provided a much better basis for estimating SOC stabilisation capacity. The maximum C loading rate (mg C m(-2)) for both Allophanic and non-Allophanic soils was best described by a log/log relationship between specific SA and the SOC content of the fine fraction. A multi-variate regression that included extractable Al and soil pH along with SA provided the "best fit" model for predicting SOC stabilisation. The potential to store additional SOC (i.e. saturation deficit) was estimated from this multivariate equation as the difference between the median and 90th percentile SOC content of each soil. There was strong evidence from the predicted saturation deficit values and their associated 95 % confidence limits that nearly all soils had a saturation deficit > 0. The median saturation deficit for both Allophanic and non-Allophanic soils was 12 mg C g(-1) at 0-15 cm depth and 15 mg C g(-1) at 15-30 cm depths. Improving predictions of the saturation deficit of soils may be important to developing and deploying effective SOC sequestration strategies.
引用
收藏
页码:71 / 87
页数:17
相关论文
共 69 条
[1]   Carbon, nitrogen, and sulfur pools in particle-size fractions as influenced by climate [J].
Amelung, W ;
Zech, W ;
Zhang, X ;
Follett, RF ;
Tiessen, H ;
Knox, E ;
Flach, KW .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1998, 62 (01) :172-181
[2]   Estimating and mapping the carbon saturation deficit of French agricultural topsoils [J].
Angers, D. A. ;
Arrouays, D. ;
Saby, N. P. A. ;
Walter, C. .
SOIL USE AND MANAGEMENT, 2011, 27 (04) :448-452
[3]  
[Anonymous], 2010, KEYS SOIL TAX
[4]   Evaluating 50 years of time-series soil radiocarbon data: towards routine calculation of robust C residence times [J].
Baisden, W. Troy ;
Parfitt, Roger L. ;
Ross, Craig ;
Schipper, Louis A. ;
Canessa, Silvia .
BIOGEOCHEMISTRY, 2013, 112 (1-3) :129-137
[5]   Role of the soil matrix and minerals in protecting natural organic materials against biological attack [J].
Baldock, JA ;
Skjemstad, JO .
ORGANIC GEOCHEMISTRY, 2000, 31 (7-8) :697-710
[6]   The dynamics of carbon in particle-size fractions of soil in a forest-cultivation sequence [J].
Balesdent, J ;
Besnard, E ;
Arrouays, D ;
Chenu, C .
PLANT AND SOIL, 1998, 201 (01) :49-57
[7]   The significance of organic separates to carbon dynamics and its modelling in some cultivated soils [J].
Balesdent, J .
EUROPEAN JOURNAL OF SOIL SCIENCE, 1996, 47 (04) :485-493
[8]   Texture and sesquioxide effects on water-stable aggregates and organic matter in some tropical soils [J].
Barthes, Bernard G. ;
Kouakoua, Ernest ;
Larre-Larrouy, Marie-Christine ;
Razafimbelo, Tantely M. ;
de Luca, Edgar F. ;
Azontonde, Anastase ;
Neves, Carmen S. V. J. ;
de Freitas, Pedro L. ;
Feller, Christian L. .
GEODERMA, 2008, 143 (1-2) :14-25
[9]   Modelling soil attribute depth functions with equal-area quadratic smoothing splines [J].
Bishop, TFA ;
McBratney, AB ;
Laslett, GM .
GEODERMA, 1999, 91 (1-2) :27-45
[10]  
Blakemore L., 1987, METHODS CHEM ANAL SO, DOI DOI 10.7931/DL1-SBSR-10A