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通过对降雪处理下2种生物土壤结皮(藓类结皮和藻类结皮)光合及呼吸作用的测定,研究了降雪后生物土壤结皮净光合速率和呼吸速率的变化特征。结果表明:冬季生物土壤结皮净光合速率、呼吸速率受空气温度、辐射及土壤水分的影响,水分是关键影响因子;生物土壤结皮的光合及呼吸作用主要有3个阶段性的变化;降雪后生物土壤结皮的净光合速率和呼吸速率都会先增加后降低;生物土壤结皮的净光合速率和呼吸速率变化会受到积雪覆盖、降雪改变温度及水分的影响;生物土壤结皮净光合速率、呼吸速率与降雪量正相关。本研究证实了冬季生物土壤结皮的光合与呼吸作用不可忽略,对全球碳循环过程有重要意义。
The photosynthesis and respiration of two kinds of biological soil crusts (moss crusts and algal crusts) under snowfall were measured to study the changes of net photosynthetic rate and respiration rate of biological soil crusts after snowfall. The results showed that net photosynthetic rate and respiration rate of biological soil crusts were affected by air temperature, radiation and soil moisture in winter, and water content was the key factor. Photosynthesis and respiration of biological soil crusts had three stages of changes. Snowfall The net photosynthetic rate and respiration rate of biological soil crusts firstly increased and then decreased. The changes of net photosynthetic rate and respiration rate of biological soil crusts were affected by snow cover, snowfall changing temperature and water content, and biological soil crust net photosynthesis Rate, respiration rate and snowfall are positively correlated. This study confirmed that photosynthesis and respiration of soil biological crusts in winter can not be neglected and is of great significance to the global carbon cycle.