【摘要】 为深入了解坝上地区不同林龄樟子松人工林对土壤的改良作用,以承德御道口牧场林龄16、29、40 a的樟子松人工林作为研究对象,以裸沙地作为对照(CK),采用野外调查和室内试验相结合的方法,测定各林龄樟子松林不同土层(0<h≤5 cm、5 cm<h≤10 cm、10 cm<h≤20 cm、20 cm<h≤40 cm、40 cm<h≤60 cm)的理化性质,分析樟子松林龄对土壤的改良效果。结果表明:不同林龄樟子松林0<h≤10 cm土壤改良效果最佳,显著优于10 cm<h≤60 cm土壤。3种林龄的樟子松林对土壤物理性质的改良作用以29 a最佳。土壤黏粒、粉粒及粗砂粒质量分数分别在29 a出现峰值和谷值。土壤各层养分(有机质、全氮、全磷、全钾、速效氮、速效磷和速效钾)质量分数均随着林龄增加呈先增加后减小的变化趋势,29 a养分质量分数最高。通过主成分分析得出,土壤改良效果从高到低依次为29 a、40 a、16 a、CK,29 a樟子松林土壤改良效果最为显著。更多还原

【Abstract】 We used the combination of field experiment and laboratory to investigate the effect of soil improvement at different stand ages(16, 29, and 40 a) of Pinus sylvestris var. mongolica with a tract of bare land as control. We studied the soil physico-chemical properties at different depths(0<h≤5 cm, 5 cm<h≤10 cm, 10 cm<h≤20 cm, 20 cm<h≤40 cm and 40 cm<h≤60 cm) of P. sylvestris var. mongolica to analyze the soil improvement effect. The soil improvement effects at 0<h≤10 cm were the best, significantly better than those of 10 cm<h≤60 cm soil. Improvement of soil physical properties was the best in 29 th year. The contents of silt, clay and coarse sand appeared peaks and valleys at the age of 29. With the increasing stand age, the variation of soil nutrients(organic matter, total N, total P, total K, hydrolyzed N, available P and available K) increased first and then decreased. The nutrient content of 29 a P. sylvestris var. mongolica reached the maximum. By the principal component analysis, the soil improvement of P. sylvestris var. mongolica from high to low is 29, 40, 16 a and CK. The soil improvement effect of P. sylvestris var. mongolica in 29 a was the most significant.更多还原