武夷山国家公园不同林地土壤呼吸动态变化及其影响因素  

Dynamic change of soil respiration and its effecting factors in different forest lands of Wuyishan National Park

作　　者：李键[1,2] 刘鑫铭 姚成硕 宫欢欢 吴承祯 范海兰 LI Jian;LIU Xinming;YAO Chengshuo;GONG Huanhuan;WU Chengzhen;FAN Hailan(Forestry College of Fujian Agriculture and Forestry University,Fuzhou 350002,China;Key Laboratory of Forest Ecosystem and Management in Fujian Colleges,Fuzhou 350002,China;College of Ecology and Resources Engineering,Wuyi College,Nanping 354300,China;Key Laboratory for Eco-Industrial Green Technology of Fujian Provincial,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经营与过程重点实验室,福州350002 [3]武夷学院生态与资源工程学院,南平354300 [4]福建省生态产业绿色技术重点实验室,南平354300

出　　处：《生态学报》2021年第9期3588-3602,共15页Acta Ecologica Sinica

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

摘　　要：探明亚热带山岳型国家公园不同林地利用方式下土壤呼吸(Rs)的动态变化规律以及影响因素,对准确评价和预测该区域以国家公园为主体的自然保护地体系的碳收支具有重要的现实意义。以武夷山国家公园为研究对象,利用Li—8100开路式土壤碳通量测定系统对茶园、锥栗(Castanea henryi(Skam)Rehd.et Wils.)林、马尾松(Pinus massoniana Lamb.)林和裸地的土壤呼吸及近地面气温、土壤温度、土壤湿度、土壤养分和土壤微生物碳(MBC)、氮(MBN)进行测定。结果显示:(1)与近地面气温、土壤温度和土壤湿度相同,不同林地的Rs均呈现夏>春>秋>冬的季节动态,Rs的季节均值按大小排序为茶园(3.10μmol m^(-2)s^(-1))>马尾松(2.96μmol m^(-2)s^(-1))>锥栗(2.32μmol m^(-2)s^(-1))>裸地(1.43μmol m^(-2)s^(-1)),锥栗和裸地之间、锥栗与马尾松之间均差异显著(P<0.01)。除马尾松林外,其他林地水热因子(近地面气温、土壤温度和土壤湿度)的单因子二次多项式模型对Rs的拟合度最高。水热因子共同建立的复合模型中,土壤温度、湿度的幂—指数模型对茶园Rs的拟合度较高,土壤温度和土壤湿度能够解释Rs变化的80%,马尾松林的Rs较适用于土壤温度、湿度建立的对数函数模型,而三因子线性模型(进入回归法)对锥栗林和裸地的Rs的拟合度最优,R2分别为0.565和0.281。(2)茶园和锥栗林的碳、氮、磷含量均高于马尾松林和裸地,MBN含量茶园>马尾松>锥栗>裸地。茶园的Rs与全磷(TP)、有效磷(AP)、全钾(TK)、速效钾(AK)含量呈极显著(P<0.01)正相关,马尾松林的Rs受TP、TK、AK含量的影响极显著(P<0.01),锥栗林的Rs与TK、AK、MBN含量呈现显著(P<0.05)正相关,裸地的Rs受MBN含量影响较为显著(P<0.05),4种林地土壤呼吸与养分的多元逐步回归方程R2均接近1。综上,茶园和马尾松林土壤呼吸速率较高,且所有林地的土壤呼吸均呈现夏>春>秋>冬的季节动态。温�It is of practical significance for the accurate evaluation and prediction of the carbon budget of the natural reserve system in the region with national park as main body to explore the dynamic changes of soil respiration(Rs)and the influencing factors under different forest land use patterns in subtropical mountain-type national park.In Wuyishan National Park,the soil respiration,near surface temperature,soil temperature,soil moisture,soil nutrients,soil microbial carbon(MBC)and soil microbial nitrogen(MBN)of tea garden,Castanea henryi(skam)Rehd.et Wils.forest,Pinus massoniana Lamb.forest and bare land were measured by Li—8100 open circuit soil carbon flux measurement system.The results showed that:(1)Same as the near surface temperature,soil temperature and soil moisture,the Rs of different forest lands were ranked seasonally as summer>spring>autumn>winter,and the seasonal mean of the Rs was in the order of tea garden(3.10μmol m^(-2)s^(-1))>P.massoniana(2.96μmol m^(-2)s^(-1))>C.henryi(2.32μmol m^(-2)s^(-1))>bare land(1.43μmol m^(-2)s^(-1)).There were extremely(P<0.01)significant differences between C.henryi forest and bare land,and between C.henryi forest and P.massoniana forest.Except for P.massoniana forest,the single-factor quadratic polynomial model of hydrothermal factors(near surface temperature,soil temperature and soil moisture)had the highest fitting degree to Rs.In the composite model jointly established by hydrothermal factors,the power-exponential model established of soil temperature and moisture had a high fitting degree to Rs of tea garden.Soil temperature and moisture can explain 80%of the change in Rs.The Rs of P.massoniana forest was suitable for the logarithmic function model established by soil temperature and moisture,and the three-factor linear model(Enter-regression method)had the best fit for Rs in C.henryi forest and bare land,with R2 of 0.565 and 0.281,respectively.(2)The contents of the carbon,nitrogen,and phosphorus of tea garden and C.henryi forest were higher than those of P

关 键 词：土壤呼吸 季节动态 温度 土壤湿度 土壤养分 武夷山国家公园 

分 类 号：S714[农业科学—林学]