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在全球变暖的背景下,陆地生态系统碳循环在大气CO2浓度变化过程中扮演重要角色,而目前大面积推广的林药或农林复合模式在平衡经济发展和维持环境生态的关系中起着举足轻重的作用.2014年1-12月,采用Li-8100对川中丘陵区核桃人工纯林(CK)、核桃-川明参复合模式(HC)、核桃-桔梗复合模式(HJ)、核桃-藿香复合模式(HH)4种林分的土壤呼吸进行定点观测,同时测量土壤温度和湿度.结果发现:各处理土壤呼吸月动态变化呈先增后减趋势,HC最大值出现在6月下旬,而CK、HJ和HH土壤呼吸峰值出现在7月中旬.4种林分最低值都出现在1月,HC、HJ、HH分别是CK的1.36倍、1.61倍和0.89倍.土壤呼吸与土壤温度呈极显著指数增长关系,土壤湿度与土壤呼吸呈倒数关系,但仅HH处理显著.川中丘陵区4种林药模式中,HH模式更有利于减小土壤碳排放.估算各林-药复合模式下土壤呼吸年内总碳排放量大小依次为CK、HJ、HC、HH.本研究表明土壤温度是川中丘陵区土壤呼吸变化的主要因素,不同的人工经营模式对研究区的土壤碳源/汇角色扮演有重要影响.
In the context of global warming, the carbon cycle of terrestrial ecosystems plays an important role in the change of atmospheric CO2 concentration. At present, the large-scale forest medicine or agroforestry model plays an important role in balancing the relationship between economic development and environmental conservation From January to December in 2014, the effects of Li-8100 on the changes of CK, HCH, HJ, walnut-Agastache, The results showed that the dynamic monthly changes of respiration in all treatments presented the trend of increase first and then decrease, and the maximum value of HC appeared in the end of June, while the soil HC The peak values of soil respiration in CK, HJ and HH appeared in mid-July, and the minimum values of all the four species appeared in January, and the values of HC, HJ and HH were 1.36, 1.61 and 0.89 times of that of CK, respectively. Extremely significant exponential growth relationship between soil moisture and soil respiration was reciprocal, but only HH treatment significantly.Hell mode in the Central Sichuan Hilly four kinds of forest models, HH mode is more conducive to reduce soil carbon emissions estimated forest-drug combination mode Soil respiration Total carbon emissions during the year Followed by CK, HJ, HC, HH. This study showed that soil temperature is a major factor in Sichuan hilly area of soil respiration changes, different artificial business model have a major impact on soil carbon study area / sink RPG.