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首页> 外文期刊>Pakistan journal of botany >Moss coverage improves the microclimates of subalpine forests: implications of Qinghai spruce recruitment in Qilian Mountains, northwest China
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Moss coverage improves the microclimates of subalpine forests: implications of Qinghai spruce recruitment in Qilian Mountains, northwest China

机译：苔藓覆盖率改善了亚高山森林的微跨度：青海云杉招募在中国西北祁连山的影响

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Understanding the mechanisms of moss affecting the understory microclimates may further shed lights on forest recruitment, which is closely associated with hydrological and ecological processes of forest ecosystems. We conducted a one-year field experiment to examine the effects of moss thickness on understory microclimates including ground surface temperature (GST), ground surface moisture (GSM), soil temperature (ST), and soil moisture (SM) in a Picea crassifolia forest of Qilian Mountains, northwest China. We found that moss coverage substantially reduced the fluctuation amplitudes of microclimates ( p 0.01), as evidenced by the slower diurnal changes in GST, GSM, ST, and SM of moss-covered soil than those of bare soil. Moreover, our results also showed that moss coverage obviously increased GST and ST in winter (December 2014), whereas significantly decreased GST and ST in summer (June 2015). Comparing with bare soil, thick-moss coverage decreased the average annual GST and ST by 0.55°C and 0.62°C, respectively. However, moss coverage significantly increased the annual GSM and SM ( p 0.01), especially the SM of thin-moss coverage was increased much higher than that of thick-moss coverage and bare soil. In addition, moss coverage may also prevent heat flux from air to soil surface because the light radiation was exponentially declined from the upper moss canopy to soil with the increase of moss depths. These results suggested that moss coverage may promote the microclimates of the forest understory with heat insulation and water holding, and thus facilitate the P. crassifolia germination and recruitment through changing the hydrological and ecological processes of subalpine forests.
机译：了解影响林下微跨度的苔藓机制可能进一步揭示森林招募的灯，这与森林生态系统的水文和生态过程密切相关。我们进行了一年的田间实验，以检查苔藓厚度对林下微跨度的造型厚度的影响，包括地表温度（GST），地面水分（GSM），土壤温度（ST）和土壤水分（SM）在Picea Crassifolia森林中祁连山，中国西北。我们发现苔藓覆盖率大大降低了微亚亚亚亚亚酸的波动幅度（P <0.01），如GST，GSM，ST和苔藓覆盖的土壤的较慢的昼夜变化而不是裸土壤。此外，我们的结果还表明，莫斯覆盖率明显增加了GST和ST在冬季（2014年12月），而在夏季（2015年6月）明显减少了GST和St。与裸土相比，厚苔覆盖率分别下降0.55°C和0.62°C的平均GST和ST。然而，苔藓覆盖率明显增加了年度GSM和SM（P <0.01），特别是薄苔覆盖率的SM比厚苔覆盖率和裸机的覆盖率高得多。此外，苔藓覆盖也可能防止从空气到土壤表面的热量通量，因为光辐射从上苔冠层与苔藓深度的增加。这些结果表明，苔藓覆盖可能会促进森林林的微跨度与隔热和水持，因此通过改变亚高山森林的水文和生态过程，促进P. Crassifolia萌发和招生。

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