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作 者:李熙波[1,2] 杨玉盛[1,2] 曾宏达[1,2] 谢锦升[1,2] 陈光水[1,2] 朱宁[1,2] 马书国[1,2]
机构地区:[1]湿润亚热带山地生态省部共建国家重点实验室培育基地,福州350007 [2]福建师范大学地理科学学院,福州350007
出 处:《生态学报》2011年第8期2096-2105,共10页Acta Ecologica Sinica
基 金:福建省自然科学基金(2007J0346);福建省教育厅科学基金资助项目(JB07069)
摘 要:随城市化进程加速,城市草坪生态系统释放CO2将对区域碳循环产生重要影响。采用LI-8100开路式土壤碳通量测量系统对亚热带沟叶结缕草草坪(Zoysia matrella)土壤呼吸进行为期1a的定位研究,结果表明:草坪土壤呼吸季节动态呈现为单峰曲线,全年土壤呼吸速率的变化范围在38.99—368.50 mg C.m-.2h-1之间,年通量为1684 g C.m-.2a-1。土壤温度、总生物量、以及二者的交互作用对土壤呼吸季节变化的解释程度接近,分别为89%、88%和90%,但仅二者的交互作用进入土壤呼吸的逐步回归方程,表明草坪土壤呼吸的季节变化主要受土壤温度与总生物量共同驱动。春末修剪草坪对土壤呼吸速率没有显著影响。在秋末无雨时期,浇水后1—2d土壤湿度对土壤呼吸的促进作用可掩盖同期降温的影响,使土壤呼吸速率显著升高。Soil respiration,the CO2 efflux from soil,is a major carbon flux between ecosystems and the atmosphere.Identifying soil respiration rates of a variety of ecosystems is a necessary step in understanding of global carbon(C) cycling.However,while soil respiration of many non-urban ecosystems such as forest,grassland,desert and cropland have received much attention,little information is available of soil respiration in urban ecosystems.Specifically,the data about soil respiration from turfgrass cultivation is scare,despite that this ecosystem is expanding quickly along with a high rate of urbanization and that C releases from turfgrass soil have shown the potential to alter local C cycling process and C budget.In this study,the seasonal variation in soil respiration,measured using LI-8100 automated soil CO2 flux system,was monitored biweekly for one year(Jan to Dec 2008) in a subtropical Zoysia matrella turfgrass in the Minjiang Riverside Park of Fuzhou City(26°03′ N,119°15′ E),Fujian Province,China.The effects of clipping and irrigation on soil respiration were also investigated.The results indicated that the seasonal variation in soil respiration characterized a pattern of mono-peak curve and varied from 38.99 to 368.50 mg C·m-2·h-1.Despite the fact that soil temperature(Ts),total biomass(TB) and their interaction(TB×Ts) could explain 89%,88% and 90% of seasonal variation in soil respiration(Rs),respectively.The seasonal change in soil respiration was mainly controlled by the interaction of two factors,as suggested by a multiple stepwise regression model(ln(Rs) = 3.248+3.05×10-5×TB×Ts,R2=0.90,P0.01).The annual flux from soil respiration in the turfgrass amounted to 1684 g C·m-2·a-1,which are higher than other ecosystems in the same climate zone of similar amounts of precipitation.This extremely high value might be caused by human managements,such as irrigation and fertilization in turfgrass.Clipping had no significant effect on soil respiration,soil temperature
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