黄土高原油松人工林地土壤养分及化学性质的时空效应

研究了黄土高原油松人工林土壤养分及化学性质的时空分布特征。结果表明,油松林地土壤有机质、全氮、速效氮、速效磷、速效钾含量及pH值随树龄增加无确定的变化规律;土壤全磷含量随树龄增加按幂函数衰减;土壤交换性钙含量和交换性盐基总量随树龄增加按Logstic模型变化;交换性镁含量随树龄增加按幂函数递增;油松林地土壤有机质、全氮、速效氮、速效磷、速效钾含量随土壤深度的增加按幂函数衰减,土壤全磷、交换性钙和交换性镁含量及交换性盐基总量随土壤深度增加无确定变化规律,但土壤pH值随深度增加按幂函数增加。与撂荒地相比,油松林地土壤有机质、全氮、速效氮、全磷、速效磷、交换性钙、交换性镁含量及交换性盐基总量分别增加了46.4%~317.9%,18.7%~234.5%,174.8%~290.3%,19.7%~53.3%,0.6%~54.7%,74.1%~102.6%,6.0%~47.1%和83.7%~114.2%,速效钾则出现了表面富集化现象。表明油松林能够有效改善土壤的养分状况。

Time-space distributive feature of soil nutrient condition and chemical properties of Pinus tabulaeformi plantation forestland in Loess Plateau

The time-space distributive feature of soil nutrient condition and chemical properties of Pinus tabulaeformis plantation forestland in Loess Plateau has been studied. The results showed that soil organic matter,pH,total N,and available N,P and K change irregularly with tree age;total P decreases by power function;exchangeable Ca and base capacity vary by Logstic model;exchangeable Mg increases by power function; soil organic matter; total N, available N, P and K decrease by power function with soil depth ;total P,exchangeable Ca, Mg and base capacity vary irregularly with soil depth, but pH-value rises by power function with depth;Compared with wasteland,soil organic matter,total N,available N,total P, available P, exchangeable Ca, Mg and base capacity rise respectively by 46. 4%-317. 9%, 18. 7%- 234. 5%,174. 8%-290. 3%,19.7%-0-53.3%,0. 6%-54.7%,74.1%-102.6%,6. 0%-47.1%,83.7%- 114.2%;available K appears surtificial enrichment. These show that Pinus tabulaeformis Carr. plantation can improve the condition of soil nutrient effectively.