Soil CO2 emission of sugarcane fields as affected by topography
Soil CO2 emission of sugarcane fields as affected by topography
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DOI：
10.1590/s0103-90162009000100011
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发表时间：
2009-02
影响因子：
2.6
通讯作者：
L. F. Brito;J. M. Júnior;G. T. Pereira;Z. M. Souza;N. L. S. Júnior
中科院分区：
文献类型：
--
作者：
L. F. Brito;J. M. Júnior;G. T. Pereira;Z. M. Souza;N. L. S. Júnior
土壤CO2排放的时空变化受与CO2产生及其在土壤中扩散有关的土壤属性的影响。然而，很少有研究旨在了解地形对CO2排放量的变化的影响存在，特别是对热带地区的种植区。研究了不同地形和坡位下甘蔗种植区土壤CO2排放的时空变化及其与土壤属性的关系。平均二氧化碳排放量在研究期间（7个月）变化之间的0.23和0.71，0.27和0.90，和0.31和0.80克m-2 h-1的二氧化碳的凹（浓度），backslope（BackS）和footslope（FootS）的位置，分别。CO2排放量与土壤温度呈指数关系，与土壤含水量呈线性关系。Conc、BackS和FootS的Q10值分别为1.98（± 0.34）、1.81（± 0.49）和1.71（± 0.31）。体积密度，大孔隙度，渗透阻力，聚集和可氧化有机碳含量解释观察到的土壤CO2排放量的变化，特别是当浓度的位置相比，BackS。地貌形态和地形位置对土壤CO2排放变化的影响与测量时间有关。
The spatial and temporal variation of soil CO2 emission is influenced by several soil attributes related to CO2 production and its diffusion in the soil. However, few studies aiming to understand the effect of topography on the variability of CO2 emissions exist, especially for cropping areas of tropical regions. The objective of this study was to evaluate the spatial and temporal changes of soil CO2 emission and its relation to soil attributes in an area currently cropped with sugarcane under different relief forms and slope positions. Mean CO2 emissions in the studied period (seven months) varied between 0.23 and 0.71, 0.27 and 0.90, and 0.31 and 0.80 g m-2 h-1 of CO2 for concave (Conc), backslope (BackS) and footslope (FootS) positions, respectively. The temporal variability of CO2 emissions in each area was explained by an exponential relation between the CO2 emission and soil temperature and a linear relation between CO2 emission and soil water content. The Q10 values were 1.98 (± 0.34), 1.81 (± 0.49) and 1.71 (± 0.31) for Conc, BackS and FootS, respectively. Bulk density, macroporosity, penetration resistance, aggregation and oxidizable organic carbon content explain the changes in soil CO2 emission observed, especially when the Conc position was compared to BackS. The effect of relief form and topographic position on soil CO2 emission variation was dependent on the time of measurement.