沈阳东陵古油松生长衰弱原因与土壤条件关系研究

Study on the Relationship Between the Cause of the Debilitating Growth of Aged Pinus Tabulaeformis in Dongling and Soil Conditions

本文通过对沈阳东陵的部分古油松周围土壤条件的调查,并且对土壤物理性质、土壤化学性质以及土壤养分的研究分析。结果表明：土壤的表层水分含量高达25.1%,超出其适宜范围,易造成古油松烂根;土壤渗水性较差,不利于排水。土壤总孔隙度适中,但毛管孔隙度过高,非毛管孔隙度过低,多为2.8%~7.8%,小于最低限。土壤酸性过强,不利于古油松生长。土壤缺乏有机质和全N,而有效Zn、有效Cu、有效Fe含量均偏高,直接影响古油松的生长。建议改善土壤条件,从而改变东陵古油松生长衰弱的现状。

This article is based on the investigation of soil conditions of part of aged Pinus tabulaeformis in Dongling, Shenyang. The soil physical properties, soil chemical properties and soil nutrients are also analysed. The results showed that the moisture of surface soil is as high as 25.1%, which exceeds its appropriate range and could easily lead the aged P/nus tabulaeformis to rot their roots. Water permeability of the soil is rather poor, which is not conducive to drainage. A suitable total soil porosity but with high capillary porosity and very low noncapillary porosity of 2.8%-7.8%, which is even lower than the lowest limit. The acidity of soil is too strong, which is not conducive to the growth of aged Pinus tabulaeformis. The soil is lack of organic matter and total nitrogen, however, the content of available zinc, iron and copper are higher than the proper content, which directly affects the growth of aged Pinus tabulaeformis. In order to change the present situation of debilitating growth of aged Pinus tabulaeformis in Dongling, we suggest that soil conditions must be improved.