武夷山不同林龄甜槠林土壤呼吸特征及影响因素  

Soil respiration characteristics and influencing factors of Castanopsis eyrei forest in different forest ages in Wuyi Mountain

作　　者：赵青 刘爽 陈燕菲 吴承祯 范海兰[1,2] 林勇明 李键[1,2] ZHAO Qing;LIU Shuang;CHEN Yanfei;WU Chengzhen;FAN Hailan;LIN Yongming;LI Jian(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Key Laboratory of Forest ecosystem process and Management of Fujian Province,Fuzhou 350002,China;Key Laboratory for Eco-Industrial Green Technology of Fujian Provincial,Nanping 354300,China;College of Ecology and Resource Engineering,Wuyi University,Nanping 354300,China)

机构地区：[1]福建农林大学林学院,福州350002 [2]福建省高校森林生态系统过程与经营重点实验室,福州350002 [3]福建省生态产业绿色技术重点实验室,南平354300 [4]武夷学院生态与资源工程学院,南平354300

出　　处：《生态学报》2021年第6期2326-2338,共13页Acta Ecologica Sinica

基　　金：福建农林大学科技创新专项基金项目(CXZX2016052,CXZX2018122);福建农林大学林学高峰学科建设项目(71201800705)。

摘　　要：为揭示中亚热带常绿阔叶林群落优势种一甜槠天然林不同林龄林下土壤呼吸(Soil respiration,RS)差异及影响因素,采用LI-8100开路式土壤碳通量系统对武夷山自然保护区不同林龄(18、36、54、72 a)天然甜槠林进行了1年的野外原位测定。结果表明:(1)不同林龄甜槠林RS季节动态呈现明显的单峰趋势,林龄对冬季RS影响并不显著(P>0.05),秋季18 a甜槠林RS与其他3种林龄差异显著(P<0.05),林龄对土壤含水率的季节变化没有显著影响(P>0.05);(2)不同林龄甜槠林5 cm深土壤温度与RS拟合R2明显高于土壤含水率与RS拟合R2,随着林龄增大,RS温度敏感性指数Q10值呈上升趋势,依次为1.551、1.589、1.640、1.664,且54、72 a甜槠林RS温度敏感性指数Q10值显著高于18、36 a(P<0.05);(3)土壤含水率与5 cm深土壤温度共同解释了RS变异的86%—90.3%;0—60 cm土层根系生物量与5 cm深土壤温度共同解释了RS变异的88.3%—91.8%,由此可见,生物因子与非生物因子双因素拟合可以更好地解释不同林龄RS差异。在对未来森林植被土壤呼吸及碳汇功能进行研究时,应在考虑林龄及季节差异的基础上,加强对生物因子的测定。Soil respiration, as an important ecological process of material cycle and energy flow in forest ecosystem, is one of the main fluxes in the global carbon cycle, and plays an important role in the global carbon cycle and carbon balance. There are many factors that affect forest soil respiration, mainly non-biological factors such as soil temperature, water content and air temperature, etc. However, with different climatic zones and forest types, forest age has an important impact on carbon storage and carbon distribution in forest ecosystems, and there is also great uncertainty of the impact on soil respiration. In this paper, soil carbon flux system LI-8100 was used to measure soil respiration and its components in Castanopsis eyrei forests(18 a, 36 a, 54 a, and 72 a) of different forest ages in Wuyishan Nature Reserve. Meanwhile, soil temperature of 5 cm depth and soil water content were simultaneously measured. The results showed that:(1) the seasonal dynamics of soil respiration in Castanopsis eyrei forests with different forest ages presented a single peak trend, and the effect of forest age on soil respiration in winter was not significant(P>0.05). The soil respiration in 18 a Castanopsis eyrei forests in autumn was significantly different from that of the other three forest ages(P<0.05), and the forest age had no significant effect on the seasonal changes of soil water content(P > 0.05).(2) Fitting R2 of soil temperature of 5 cm depth and soil respiration in different forest age Castanopsis eyrei forest was significantly higher than fitting R2 of soil water content with soil respiration. With the increase of forest age, the Q10 value of soil respiration temperature sensitivity index showed an upward trend, which was 1.551, 1.589, 1.640 and 1.664 in turn, while the Q10 value of soil respiration temperature sensitivity index of 54 a and 72 a Castanopsis eyrei forest was significantly higher than that of 18 a and 36 a Castanopsis eyrei forest(P < 0.05).(3) Soil water content and soil temperature of 5 cm depth

关 键 词：武夷山自然保护区 甜槠 林龄 土壤呼吸 

分 类 号：S718.5[农业科学—林学]