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为了揭示不同植被覆盖下土壤/大气界面释汞通量及其交换特征,在缙云山国家级自然保护区内选择4种典型植被覆盖类型(常绿阔叶林、楠竹林、灌木林以及草地)为研究对象,连续同步监测不同植被覆盖下土/气界面汞释放通量,同时考察各环境因子对土壤释汞的影响.结果表明,缙云山在4种不同植被覆盖下土壤汞释放通量具有明显的差异,总体表现为楠竹林[17.77 ng·(m~2·h)~(-1)]>草地[17.58 ng·(m~2·h)~(-1)]>灌木林[16.87 ng·(m~2·h)~(-1)]>常绿阔叶林[14.32 ng·(m~2·h)~(-1)];不同植被覆盖下土壤释汞通量在季节变化上呈现相似的规律性,但不同植被覆盖类型之间也存在明显差异,主要体现在暖季汞释放通量高于冷季;缙云山地区不同林植被覆盖下土壤释汞通量存在明显的日变化;气象因素光照强度、气温、土温和相对湿度,对土/气界面汞释放通量影响也不相同,气温为常绿阔叶林,灌木林与楠竹林的主要影响因子,光照强度为草地的主要影响因子.
In order to reveal the mercury release fluxes and their exchange characteristics under different vegetation cover, four typical vegetation cover types (evergreen broad-leaved forest, bamboo grove, shrub and grassland) were selected in Jinyun Mountain National Nature Reserve The results showed that the release flux of mercury in soil under four kinds of vegetation cover in Jinyun Mountain was significantly higher than that in other four vegetation coverings (17.77 ng · m -2 · h -1) grassland [17.58 ng · (m -2 · h -1)]> shrub forest [16.87 ng · (m ~ 2 · h -1)]> evergreen broad-leaved forest [14.32 ng · (m -2 · h -1)]. The change of soil total dissolved- But there are also significant differences among different types of vegetation cover, which are mainly manifested in the higher flux of mercury released in warm season than in cold season; there is a clear diurnal variation of soil mercury release flux under different vegetation cover in Jinyun Mountain; Meteorological factors Light intensity, air temperature, soil temperature and relative humidity have different effects on the mercury release fluxes at the soil / air interface. The temperature is evergreen broad-leaved forest, The main influence factors of woodland and bamboo forest were light intensity, which was the main influence factor of grassland.