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Short‐term spatiotemporal variation of soil CO 2 emission, temperature, moisture and aeration in sugarcane field reform areas under the influence of precipitation events
Author(s) -
Silva Elienai Ferreira da,
Moitinho Mara Regina,
Teixeira Daniel De Bortoli,
Bicalho Elton da Silva,
Castioni Guilherme Adalberto Ferreira,
Pereira Gener Tadeu,
Scala Newton
Publication year - 2020
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/sum.12633
Subject(s) - environmental science , precipitation , water content , spatial variability , soil water , soil science , hydrology (agriculture) , geography , geology , mathematics , meteorology , statistics , geotechnical engineering
Soil CO 2 emission (FCO 2 ) in agricultural areas results from the interaction of different factors such as climate and soil conditions. Our objective was to investigate the spatiotemporal variation of FCO 2 , temperature (T soil ), moisture (M soil ) and air‐filled pore space (AFPS), as well as their interactions, during the sugarcane field reform. The study was conducted on a 90 × 90 m sampling grid with 100 points at 10 m spacings. Ten assessments of FCO 2 , T soil and M soil were carried out at each point over a 28‐day period. The greatest mean values of FCO 2 (0.74 g m −2 hr −1 ) and M soil (31.7%) were obtained on Julian day 276, 2013, being associated with precipitation events at the study site. Also, the smallest values of AFPS (19.17%) and T soil (20.90°C) were observed on the same day. The spatial variability of FCO 2 , T soil , M soil and AFPS was best described by an adjusted spherical model, although an exponential model better fitted some results. The spatial pattern of all soil attributes showed little temporal persistency, indicating a high complexity for FCO 2 during precipitation. Correlation maps assisted in identifying regions where M soil and AFPS better controlled the emission process and where T soil was important. A major challenge for world agriculture is to increase the efficiency of conventional soil management practices. We highlight the importance of the spatial pattern of soil properties that directly influence the CO 2 emission dynamics. Future mitigation actions should involve less intense tillage and ensure homogeneous applications of soil inputs, thereby reducing production costs and the contribution of these activities to CO 2 emissions during the sugarcane field reform.