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对中亚热带不同发育阶段的杉木(Cuninghamia lanceolgta)和湿地松(Pinus elliottii)人工林以及对照次生常绿阔叶林土壤的有机质、全氮、全磷和碱解氮、速效磷和速效钾含量进行了研究。结果表明:从不同森林类型来看,土壤有机质、全氮和全磷表现为次生林高于杉木和湿地松林,且杉木随着林龄增加而增加,湿地松随林龄增加而降低,但土壤全磷相对前二者变化较平缓;土壤速效态养分总体也表现为次生林高于杉木和湿地松林,但10年生和20年生杉木林土壤碱解氮和速效钾含量低于30年生杉木林的土壤,而湿地松林土壤则相反;另外,从生态环境角度探讨了肥力指标演变可能带来的生态环境影响,提出适当延长杉木人工林轮伐期和缩短湿地松人工林轮伐期对土壤肥力和有机碳库功能保持具有现实意义。
The contents of soil organic matter, total nitrogen, total phosphorus and available nitrogen, available phosphorus and available potassium in Cuninghamia lanceolgta and Pinus elliottii plantations and control secondary broad-leaved evergreen forests Were studied. The results showed that the contents of soil organic matter, total nitrogen and total phosphorus in the secondary forest were higher than those in the Chinese fir and Pinus elliottii forest, and the Chinese fir increased with the increasing of the forest age. However, Phosphorus relative to the former two changes relatively flat; soil available nutrients in general also showed that the secondary forest higher than the Chinese fir and Pinus elliottii, but 10-year and 20-year Chinese fir plantation soil available nitrogen and available potassium content is lower than the 30-year-old Chinese fir soil, While the soil of Pinus elliottii was the opposite. In addition, the ecological and environmental impacts of the fertility index evolution were discussed from the point of view of ecological environment. Proposed to extend the rotation period of Chinese fir plantation properly and shorten the rotation period of Pinus elliottii plantation to soil fertility and organic carbon Library function to maintain a realistic meaning.