论文部分内容阅读
在东北林业大学校区实验林场,利用Li-8100土壤CO2通量全自动测量仪测定不同程度人为压实落叶松人工林夏季土壤CO2的日排放速率,并建立土壤呼吸日变化的回归模型.结果表明:不同人为压实处理落叶松人工林土壤呼吸速率存在极显著性差异.对照地夏季土壤呼吸日变化速率的最大值出现在15:30—17:30,最小值出现在03:30—05:30,均滞后于压实地.压实主道和压实支道土壤呼吸速率最大值分别出现在09:30—11:30和11:30,最小值出现在23:30至次日01:30和01:30—03:30.各处理土壤呼吸速率与地表温度、相对湿度和10cm土壤温度均存在极显著相关关系,但与5cm土壤湿度的相关性随压实程度的增加而趋于不显著;压实改变了土壤表层物理结构,使土壤表面CO2释放速率降低.
In the experimental forest farm of Northeast Forestry University, the daily soil CO2 emission rate of artificial-made Larix gmelinii plantations was measured by Li-8100 soil CO2 flux automatic measuring instrument and the regression model of diurnal variation of soil respiration was established. : There was a significant difference in soil respiration rate between different man-made compacted larch plantations.The maximum daily rate of soil respiration in summer was 15: 30-17: 30 and the minimum was 03: 30-05: 30, both lagging behind the compaction.the maximal respiration rate of compacted main road and compacted branch appeared at 09: 30-11: 30 and 11: 30 respectively, and the minimum appeared at 23: 30 to 01: 30 and 01: 30-03: 30. There was a significant correlation between soil respiration rate and surface temperature, relative humidity and soil temperature at 10 cm. However, the correlation between soil respiration and soil moisture at 5 cm decreased with increasing compaction degree Significant; compaction changed the physical structure of the soil surface, so that the surface of the soil CO2 release rate decreased.