摘要
【目的】了解土壤有机质时空变化情况,对提高耕地利用率和实现农田土壤可持续利用有重要意义。【方法】本研究以彭州市为例,参照1982年第二次土壤普查样点,采用GPS定位采集了202个水田土壤样品,结合地统计学分析了1982-2007年25年间成都平原水田土壤有机质时空变异特征。【结果】时间上,水田土壤有机质平均含量由25.65g/kg(1982年)增加到33.04g/kg(2007年),25年间水田土壤有机质明显提高,有机质含量等级大部分由Ⅲ级增加为Ⅱ级;空间上,土壤有机质分布格局发生了强烈改变,高值区从东南转向中部,低值区从东北转向西南,水田土壤有机质含量增加区域占调查区总面积的94.2%,水田土壤固碳作用比较明显。【结论】彭州市水田土壤有机质分布格局随时间变化而发生了强烈的改变,在指导水田土壤施肥,农田开发和制定相关政策时应加以考虑。
[Objective] Knowing the tempo-spatial variations of soil organic matter （SOM） is very important to improve the utilization efficiency of cultivated land and for agricultural sustainable development. [Method] Based on the second soil census in 1982, 202 paddy soil samples were col- lected using GPS technique in Pengzhou. Tempo-spatial variations of SOM in the paddy fields from1982 to 2007 were evaluated using geostatistics and geographic information system. [Re- sults] SOM contents were obviously increased in paddy fields. The average SOM content was in- creased from 25.65 g/kg in 1982 to 33.04 g/kg in 2007. Most of SOM content grade was im- proved from grade Ⅲ to Ⅱ. There were significant changes in the spatial distribution of SOM be- tween two years. The areas of high SOM content were shifted from southeast to central and the areas of low values were shifted from northeast to southwest. SOM was increased in 94.2% of the investigated paddy fields. Therefore, paddy soil was better for carbon fixation. [Conclusion] Dis- tribution patterns in SOM of paddy fields in Pengzhou varied strongly with time. This result may be helpful to guide paddy field fertilization and to formulate the relevant policies.
出处
《四川农业大学学报》
CSCD
北大核心
2012年第4期445-450,共6页
Journal of Sichuan Agricultural University
基金
科技部"十一五"科技支撑计划(No.2008BADC4B04)
关键词
土壤有机质
水田
时空变异
成都平原
soil organic matter
paddy field
tempo-spatial variation
Chengdu plain
