• 研究报告 •

辽宁章古台地区不同年龄樟子松固沙林对土壤pH值的影响

1. 1辽宁工程技术大学环境科学与工程学院， 辽宁阜新 123000; 2辽宁省沙地治理与利用研究所， 辽宁阜新 123000）
• 出版日期:2019-11-10 发布日期:2019-11-10

Effects of Pinus sylvestris var.mongolicasand fixation plantations with different ages on soil pH in Zhanggutai, Liaoning Province.

LEI Ze-yong1*, BAI Jin-ning1, ZHOU Feng-yan2, YU Dong-wei1, LI Yao1

1. (1College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China; 2Liaoning Institute of Sandy Land Control and Utilization, Fuxin 123000, Liaoning, China).
• Online:2019-11-10 Published:2019-11-10

Abstract: Establishment of Pinus sylvestris var.mongolica plantations is an important strategy to control desertification. Afforestation generally changes soil pH. However, changes in soil pH caused by the establishment of P. sylvestris var. mongolica sandfixing forests are not well documented. In this study, we measured soil pH (0-100 cm soil layer) in P. sylvestris var. mongolica forests at different developmental stages (young, middleaged, mature, and overmature) in Zhanggutai of Liaoning Province. The results showed that the range of pH values shifted from two levels (0-10 or 0-20, 20-100 cm) to three levels (0-10 or 0-20, 20-40, 40-100 cm). With the increases of stand age, soil pH decreased significantly in 0-20 cm layer, and kept unchanged in 20-40 cm layer. Soil pH in 40-100 cm layer of young and mature forests were significantly higher than that of over-mature forests, while there was no significant difference between over-mature forests and grasslands. Soil pH was significantly positively related to total K content and negatively related to available P content in 0-10 cm soil layer. There was a significant negative correlation between soil pH and available K and soil organic C contents, a positive correlation with soil water content in 10-20 cm layer, and positive correlations with available N, total N and total P contents in 20-40, 40-60, 60-80 cm soil layers. In young forests, soil pH was positively correlated with C/P ratio, available N, bulk density in 20-40 and 60-80 cm layers, respectively, and negatively correlated with N/P ratio in 80-100 cm layer. In middleaged forests, soil pH was negatively correlated with C/P ratio in 10-20 cm layer, and positively correlated with FS (the sum percentage of clay (<0.002 mm) and silt (0.002-0.05 mm)) and total N content in 20-40 cm and 40-60 cm layers, respectively. In mature forests, soil pH of 0-10 cm layer was significantly positively correlated with soil bulk density and available P, and positively related to soil moisture, available K and FS. Soil pH was positively correlated with total N in 20-40 cm layer and negatively correlated with C/N ratio in 60-100 cm layer. In over-mature forests, soil pH was positively correlated with available N in 0-10 cm layer, while negatively correlated with total K. There was a positive correlation between soil pH and total N in 10-20 cm layer.