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以集约和粗放经营的毛竹(Phyllostachys heterocycla‘Pubescens’)林为研究对象,探讨了春季毛竹林集约经营后土壤有机碳的变化。结果表明:(1)集约经营后毛竹林0-10和10-20cm土层土壤总有机碳含量分别下降了7.01%和18.90%,易氧化碳含量分别下降了31.22%和46.03%,0-20cm土层轻组有机质含量下降了19.87%。(2)两种毛竹林的土壤有机碳含量在剖面上整体上均随土层深度的增加而呈下降趋势,但下降幅度不同。粗放经营的毛竹林土壤易氧化碳的剖面特征与总有机碳相似,而集约经营的毛竹林存在明显差异。轻组有机质具有表聚性,主要分布在土壤表层(0-20cm)。(3)土壤总有机碳、易氧化碳、轻组有机质与土壤养分之间的相关性均达到极显著水平(p<0.01),总有机碳与速效磷显著相关(p<0.05)。(4)集约经营后,毛竹林0-10cm土层土壤易氧化碳的碳素有效率和土壤碳库活度分别下降了26.01%和50.52%,差异显著(p<0.05);10-20cm土层分别下降了35.51%和54.41%。因此,施加适当配比的有机肥和无机肥,有利于土壤中各种有机碳的积累,也可改善土壤的生物化学活性。
Taking intensive and extensive management of Phyllostachys heterocycla ’Pubescens’ as the research object, the changes of soil organic carbon after the intensive management of Moso bamboo forests in spring were discussed. The results showed that: (1) Total organic carbon in 0-10 and 10-20cm soil layers decreased by 7.01% and 18.90%, respectively, and the content of EO decreased by 31.22% and 46.03%, 0-20cm Light soil organic matter content decreased by 19.87%. (2) The soil organic carbon content of the two species of bamboo forests showed a downward trend as a whole with the depth of soil layers in the cross section, but the decreasing range was different. The profile of easily oxidizable carbon in the extensively managed Phyllostachys pubescens forest is similar to that of total organic carbon, while there is a clear difference in intensive management of the bamboo forest. Light organic matter has surface aggregation, mainly distributed in the soil surface (0-20cm). (3) The correlation between soil total organic carbon, readily oxidizable carbon, light fraction organic matter and soil nutrients reached extremely significant level (p <0.01), total organic carbon was significantly correlated with available phosphorus (p <0.05). (4) After intensive management, the carbon efficiency and soil carbon pool activity of 0-10cm soil layer in Phyllostachys pubescens forest decreased by 26.01% and 50.52%, respectively (p <0.05) Layer decreased by 35.51% and 54.41% respectively. Therefore, the application of appropriate organic and inorganic fertilizers is conducive to the accumulation of various organic carbon in the soil, but also improve the biochemical activity of the soil.