【摘要】 <正>森林土壤是维持林木健康生长的基质,其肥力特征影响并控制着林木的健康状态(Fisher et al.,2000)。森林退化与土壤肥力的衰退有密切的联系(La Mannaetal.,2004)。因此,对森林土壤特征的了解,可及时为森林健康经营提供依据。随着生态环境问题的日益突出以及森林健康理念的发展,世更多还原

【Abstract】 Variation of soil pH,and content of organic matter,nitrogen,phosphorus,and potassium in the soil was investigated in 53 forest soil plots in the mountainous areas from the southwest to the northeast of Beijing. The nutrient status was classified,and the correlation between soil organic matter and nutrients were analyzed. The plots were selected based on the representativeness of forest vegetation types. Coefficient of variation of the available phosphorus was the highest,while that of the total potassium and pH value was relatively lower. In the soil vertical profiles,the content of soil organic matter,total nitrogen,available nitrogen and potassium significantly decreased with increasing soil depth,the available phosphorus in the 0 - 10 cm layer was significantly higher than the other layers,but no significant difference was found with total phosphorus and potassium in different layers. Approximately 69. 8% of the plots had their pH between 6. 00 to 7. 50,with a few of pH value < 5. 50. The total nitrogen content in 60. 38% of the plots was less than 2. 00 g·kg -1 in the 0 - 20 cm layer,and the available nitrogen content in 73. 59% of soil plots was between 50. 1 to 150 mg·kg -1 . Total phosphorous content in 9. 43% of the plots was above 0. 8 g·kg -1 ,and the available phosphorous content in 86. 79% of soil plots was below 5 mg·kg -1 . Available potassium content in 37. 74% of the plots was more than 150 mg·kg -1 ,while that in 3. 77% was below 50. 0 mg·kg -1 . Soil organic matter was significantly correlated to total nitrogen, available nitrogen and potassium (P < 0. 01),while its correlation with available phosphorus was only found in 0 - 10 cm (P < 0. 05). Our results indicated that a few plots had a trend towards soil acidification,and a few soil plots were deficient in nitrogen and phosphorus. To improve forest health,attention should be paid to monitoring and managing soil acidity,nitrogen and phosphorus level.更多还原