不同肥力橡胶园土壤中养分的垂直分异规律

Spatial Distribution of Soil Nutrients in Soil Profile under Different Fertility of a Rubber Plantation

橡胶园土壤肥力直接影响到橡胶树的生长和割胶质量,近些年来在刺激割胶体制下,橡胶园土壤肥力下降.研究对不同肥力的橡胶园土壤主要养分的垂直分异规律进行了初步分析.结果表明:随剖面深度的增加,不同肥力的土壤有机质、全N和碱解N含量显著下降;P和K在剖面中的变化无明显规律.高肥力土壤剖面下层有机质、全N和碱解N含量显著高于中低肥力土壤.结论认为N素是当前制约橡胶生产的主要因素,土壤中有机质、全N和碱解N在剖面中下层的分布在一定程度上反映了土壤的潜在肥力.

The growth and tapping quality of rubber trees are directly affected by soil fertility. Soil fertility has decreased dramatically in the 20 years since the stimulating-tapping system was practiced. In a study reported in this paper, a preliminary analysis was made of the spatial distribution of soil nutrients in different soil profiles at a rubber plantation. The result showed that organic matter, total N and available N de- clined with increasing depth, while P and K had no obvious regularity in the soil profile. The content of organic matter, total N and available N were remarkably higher in the high fertility soil profile. It is concluded that N is the main factor restricting rubber yield. The distribution of organic matter, total N and available N in the soil profile reflects soil potential fertility to some extent.