海南省陵水县耕地土壤主要养分时空变异

Spatial-temporal Variation of Main Soil Nutrients in Lingshui of Hainan Province

在海南省陵水县采集3065个土壤样品,参照第二次土壤普查的资料,以有机质、碱解氮、有效磷、速效钾的变化为依据,分析这20多年来这些养分的时空变异。研究结果表明,陵水县有效磷的含量相比较20多年前有了一定的提高,碱解氮和速效钾都有不同程度的降低,有机质的含量有下降趋势,养分空间分布不均匀,说明陵水县存在一定程度施肥结构不合理的问题。

In order to offer farmers more reasonable fertilization scheme, to promote sustainable agricultural development and environmental protection. The characteristics of the spatial-temporal variability of nutrients in paddy soil for last more 20 years had been analyzed on the basis of the contents of organic matter, available nitrogen, available phosphorous, and available potassium, collecting 3 065 soil samples in Lingshui and comparing with The Second Soil Survey of Lingshui. The results showed that the available phosphorous in Lingshui was higher than those of more than 20 years ago, and the content of available nitrogen and potassium were decreased respectively, and the organic matter was moderate, the soil nutrient content was different in spatial distribution. The results further revealed the unbalance in soil fertilization.