TY - JOUR
T1 - Variability and determinants of soil organic matter under different land uses and soil types in eastern China
AU - Fan, Manman
AU - Lal, Rattan
AU - Zhang, Huan
AU - Margenot, Andrew J.
AU - Wu, Jingtao
AU - Wu, Pengbao
AU - Zhang, Liming
AU - Yao, Jingtao
AU - Chen, Furong
AU - Gao, Chao
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/4
Y1 - 2020/4
N2 - Assessing the spatial and temporal variability of soil organic matter (SOM) and identifying determinants of its stability are crucial to measure carbon (C) sequestration and emissions and to understand the evolution of soil functionality. In this study, a spatially dense dataset (5207 topsoil samples (0−20 cm) based on a 1 × 1 km grid) was used to produce SOM maps using geostatistical interpolation by kriging methods and to identify the determinants of SOM distribution in an intensive agricultural region of eastern China. The SOM contents were relatively low and ranged from 10 to 20 g kg−1 for 96.6 % of the total study area, indicating low-fertility soil conditions in the study area. Compared with historical soil data, the SOM content differed among different counties, and increased in most parts of Changfeng and Feidong County from 1981 to 2003. The SOM content was significantly impacted by altitude, aspect, pH, soil texture, as well as soil type and land use, but not by slope gradient, topographic wetness index (TWI) or normalized difference vegetation index (NDVI). The increased application of chemical fertilizer and organic manure in paddy and vegetable-based systems likely contributed to SOM accrual during the 22-year period. Agricultural land uses of paddy rice (Oryza sativa) and vegetable production are conductive to soil C sequestration in agricultural soils in eastern China.
AB - Assessing the spatial and temporal variability of soil organic matter (SOM) and identifying determinants of its stability are crucial to measure carbon (C) sequestration and emissions and to understand the evolution of soil functionality. In this study, a spatially dense dataset (5207 topsoil samples (0−20 cm) based on a 1 × 1 km grid) was used to produce SOM maps using geostatistical interpolation by kriging methods and to identify the determinants of SOM distribution in an intensive agricultural region of eastern China. The SOM contents were relatively low and ranged from 10 to 20 g kg−1 for 96.6 % of the total study area, indicating low-fertility soil conditions in the study area. Compared with historical soil data, the SOM content differed among different counties, and increased in most parts of Changfeng and Feidong County from 1981 to 2003. The SOM content was significantly impacted by altitude, aspect, pH, soil texture, as well as soil type and land use, but not by slope gradient, topographic wetness index (TWI) or normalized difference vegetation index (NDVI). The increased application of chemical fertilizer and organic manure in paddy and vegetable-based systems likely contributed to SOM accrual during the 22-year period. Agricultural land uses of paddy rice (Oryza sativa) and vegetable production are conductive to soil C sequestration in agricultural soils in eastern China.
KW - Determinants
KW - Geostatistics
KW - Intensive agriculture
KW - Soil organic matter
KW - Spatial-temporal variability
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U2 - 10.1016/j.still.2019.104544
DO - 10.1016/j.still.2019.104544
M3 - Article
AN - SCOPUS:85076846231
SN - 0167-1987
VL - 198
JO - Soil and Tillage Research
JF - Soil and Tillage Research
M1 - 104544
ER -