Dissertations and Theses
Spatial variability of CO2 emission, temperature and humidity in latosol under sugarcane cultivation in manual harvesting systems with burning and mechanized
Author: Alan Rodrigo Panosso
Keywords: soil respiration, soil CO2 flow, geostatistics, sugar management, soil temperature, soil moisture.
Summary
The characterization of the spatial variability of soil attributes of agricultural areas is an important task, since in addition to the influence of the pedological aspects we have a great contribution of the management. In this work, the structure of the spatial variability of CO2 emission, temperature and humidity in Eutrophic Red Latosol was determined in three localities under sugar cane cultivation in systems of management of raw cane and burned sugarcane in the northeast of the State of São Paulo Paulo. The highest emissions were observed at the site under burned cane management, with a mean value of 2.05 μmol m-2 s-1, but spatial dependence on CO2 emission was only found in areas under management of raw cane. Semivariance models were exponential, spherical and Gaussian, with spatial dependence classified as strong or moderate in all cases. The kriging maps of CO2 emission, temperature and soil moisture under burned cane management corresponded to the terrain slope, with the highest emissions and temperatures and the lowest humidities located in the highest part of the studied site. The results indicated a linear correlation between CO2 emission with temperature and soil moisture only at the site with cane management, and not with the raw cane system, where the presence of straw on the surface certainly prevents the direct action of radiation solar and the drainage of rain.