Variability of soil water content and bulk density in a sugarcane field
Variability of soil water content and bulk density in a sugarcane field
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甘蔗田土壤含水量和容重的变化
DOI：
10.1071/sr01020
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发表时间：
2002
期刊：
影响因子：
1.6
通讯作者：
L. C. Timm
中科院分区：
文献类型：
--
作者：
T. Tominaga;F. Cássaro;O. Bacchi;K. Reichardt;J. C. M. Oliveira;L. C. Timm
巴西甘蔗作物管理做法的变化，从传统的收获前焚烧垃圾到收获后将收获残留物留在田间的新做法，可能导致水分状况和土壤压实程度的改变。在这项研究中，一个中子-γ表面测量仪被用来监测土壤水分和密度的空间和时间变异性在一个实验甘蔗区提交3个收获管理措施：（i）覆盖作物与收获残留物，（ii）作物与裸行间，（iii）作物与收获前焚烧垃圾的灰烬残留物。土壤含水量和容重的变异性进行了研究，使用地质统计学工具和方差分析进行比较的平均值。自相关和半变异函数表明土壤含水量的空间依赖性，这是更高的垃圾残留物的存在下留在土壤表面收获后。处理（i）和（ii）之间的平均差异约为15%，表明在土壤水分保持方面的有益覆盖效果。（二）和（三）之间的差异要小得多。
The change in management practices of the sugarcane crop in Brazil, from the traditional trash burning before harvest to the new practice that leaves harvest residues on the field after harvest, can lead to alterations in the water regime and also in soil compaction levels. In this study a neutron-gamma surface gauge was used to monitor spatial and temporal variabilities of soil moisture and density in a experimental sugarcane area submitted to 3 harvest management practices: (i) mulched crop with harvest residues, (ii) crop with bare inter-row, and (iii) crop with ash residues from trash burning before harvest. Variability of soil water content and bulk density was studied using geostatistical tools and analysis of variance was used to compare averages. Autocorrelations and semivariograms indicate a spatial dependence of soil water contents, which were higher in the presence of trash residues left on the soil surface after harvest. The average difference between treatments (i) and (ii) was about of 15%, indicating the beneficial mulching effect with respect to soil water retention. Differences between (ii) and (iii) were much smaller.