不同区域古树土壤化学特性分析

为了研究北京市古树生长情况与土壤化学特性间的关系，对研究范围内不同区域古树的土壤进行样方分析。北京代表性古树有白皮松、油松、侧柏、国槐。通过野外采集、实验室测定以及数据处理计算，分别对十三陵庆王坟、西山的香山、十三陵明永陵和北二环附近区域的4种古树土壤进行pH值、有机质、全N、全P、全K、速效N、速效P和速效K 8种化学特性进行分析。结果表明：4个区域土壤养分含量差异显著，庆王坟古树土壤有机质、全N和全P均属于贫瘠状态，而永陵土壤全P和速效P均也属于亏缺状态。研究结果为下一步古树复壮技术提供了有效的数据支撑。

The Chemical Characteristics Analysis of Important Ancient Trees’ Soil in Different Regions of Beijing

In order to research the relationship between growth status of ancients and soil properties,the author analyzed the chemical characteristics of soils in different districts in Beijing.The representative ancient trees in Beijing are Pinus bungeanaas,Platycladus orientalis,Pinus tabulaeformis and Sophora japonica.The author analyzed 4 kinds of ancient soil pH value,organic matter,total nitrogen,total phosphorus,total potassium,available nitrogen,available phosphorus and available potassium in 8 kinds of chemical properties by the field acquisition,laboratory test,data processing and calculation,respectively,in Ming Dynasty Tombs of Kim Wong Fen,the Fragrance Hill,Ming Dynasty Tombs of the Ming Dynasty and the North Second Ring Road Region.This results showed that soil nutrient content were obvious different between 4 regions.The ancient trees in Ming Dynasty Tombs of Kim Wong Fen had barren condition of organic matter,total nitrogen,and total phosphorus.The ancient trees in Ming Dynasty Tombs of the Ming Dynasty lacked of total phosphorus and available phosphorus too.This research provided effective data to support the next step for the rejuvenation of old trees.