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通过现场采样研究了内蒙古多伦县一家河牧场华北落叶松(Larix principis-rupprechtii)人工林和兴安杨(Populus hsinganica C.Wanget Skv.)人工林0-60cm深度土壤有机质、活性有机质、土壤全量养分和速效养分含量的变化。结果表明:在相同立地条件下,不同树种相同土壤层间土壤有机质、活性有机质(0-5cm土层除外)含量存在明显差异。两树种5cm以下土层土壤活性有机质含量的差异显著,落叶松人工林5-20cm土层、20-40cm土层和40-60cm土层土壤活性有机质含量分别比兴安杨人工林高35.3%、38.8%和45.9%。两树种土壤速效氮、磷、钾含量的表聚性明显,并且随着土层深度增加速效氮、磷、钾含量降低趋势显著。落叶松人工林0-5cm、5-20cm和20-40cm土层全钾含量分别比兴安杨人工林相应的土层高30.9%、35.4%和31.6%。兴安杨人工林0-5cm土层全氮含量比落叶松人工林高55.1%。
The effects of Larix principis-rupprechtii plantation and Populus hsinganica C.Wanget Skv. On soil organic matter, active organic matter and soil total nutrients And available nutrient content changes. The results showed that there was a significant difference in soil organic matter and active organic matter (except for 0-5cm soil layer) between the same soil layers under the same site conditions. The content of active soil organic matter in the soil below 5 cm was significantly different between the two tree species. The contents of active soil organic matter in 5-20 cm soil layer, 20-40 cm soil layer and 40-60 cm soil layer in Larix gmelinii plantation were 35.3% and 38.8% % And 45.9%. The content of available N, P and K in the two tree species showed obvious polygamy, and the content of available N, P and K decreased significantly with the increase of soil depth. The total potassium content of 0-5cm, 5-20cm and 20-40cm layers in Larch plantations were 30.9%, 35.4% and 31.6% higher than the corresponding soil layers in Xingningyang plantation, respectively. The total nitrogen content in the 0-5cm soil layer in Xing’an Poplar was 55.1% higher than that in Larix gmelinii plantation.