川中丘陵区3种林-药复合种植模式土壤呼吸特征

发布时间：2018-08-18 16:47

【摘要】：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.
[Abstract]:In the context of global warming, the terrestrial ecosystem carbon cycle plays an important role in the process of atmospheric CO2 concentration change. At present, the widely popularized agroforestry or agroforestry model plays an important role in balancing economic development and maintaining the relationship between environment and ecology. Li-8100 was used to observe the soil respiration of 4 types of walnut plantation in hilly area of Sichuan province. The compound model of (HC), walnut and Platycodon grandiflorum complex model (HJ), walnut and patchouli compound model (HH) was used to observe the soil respiration, and the soil temperature and humidity were measured at the same time. The results showed that the monthly dynamic changes of soil respiration increased first and then decreased. The maximum value of HC appeared in late June. The peak values of soil respiration of CK HJ and HH in middle July were 1.36 times and 0.89 times of CK, respectively, and the lowest values of HJ in January were 1.36 times and 0.89 times of CK, respectively. Soil respiration and soil temperature increased exponentially, soil moisture and soil respiration were reciprocal, but only HH treatment was significant. The HH model of four forest medicine models in the hilly region of central Sichuan is more favorable to reduce soil carbon emissions. The total carbon emissions of soil respiration were estimated to be CKHJJ HCHH in turn. The results show that soil temperature is the main factor of soil respiration in the hilly region of central Sichuan, and different artificial management models play an important role in the role of soil carbon source / sink in the study area.
【作者单位】：四川农业大学;四川省林业勘察设计研究院;四川省林业科学研究院监测中心;四川省农业科学院土壤肥料研究所;
【基金】：国家“十二五”重大科技支撑计划课题(2011BAD38B0204-2)资助~~
【分类号】：S714.5

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