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使用LI-8100仪器实测了在生长季阿拉善的梭梭、沙冬青、红砂、华北驼绒藜、珍珠、白刺六种植物群落土壤呼吸速率,使用挖刨面法逐月测定了土壤温度和土壤含水量。结果表明:这六种荒漠植物群落土壤呼吸速率日动态均呈单峰型,最高值皆出现在12:00-14:00,最低值出现在早晨8:00,土壤呼吸速率最大值出现时间先于气温最高值出现的时间。六种植物群落土壤呼吸速率的月变化呈单峰曲线,与近地面气温的变化趋势一致。六种植物群落土壤呼吸速率的日变化与地表温度达到极显著正相关关系,与近地面气温、5cm、10cm温度具有显著相关性。六种植物群落与土壤含水量0-10cm、10-20cm、20-30cm都没有显著相关性。在源与汇的问题上,梭梭、沙冬青、红砂、珍珠、华北驼绒藜、白刺是汇。
The soil respiration rate of six plant communities in Haloxylon ammodendron, Astragalus mongholicus, Red sand, Ceratoides arborescens, Pearls and White prickles was measured by LI-8100 in the growing season. The soil temperature Soil moisture content. The results showed that the daily dynamic of soil respiration rate in all six desert plant communities showed a single peak, with the highest values occurring at 12: 00-14: 00 and the lowest at 8:00 in the morning, respectively. The maximum soil respiration rate occurred at the first At the time when the temperature is highest. The monthly variation of soil respiration rate in six plant communities showed a single peak curve, which was consistent with the change of near-surface temperature. The diurnal variation of soil respiration rate in six plant communities had a significant positive correlation with the surface temperature, which was significantly correlated with the near-surface temperature, 5 cm and 10 cm. The six plant communities had no significant correlation with soil water content of 0-10cm, 10-20cm and 20-30cm. On the issue of source and sink, Haloxylon ammodendron, sand winter green, red sand, pearl, Ceratoides arborescens, white thorn is the sink.