Observation and modeling of NPP for Pinus elliottii plantation in subtropical China

查看全文 作　　者：MA [1,3]ZeQing;LIU [1,2]QiJing;WANG [1]HuiMin;LI [1,3]XuanRan;ZENG [4]HuiQing;XU [1,3]WenJia

机构地区：[1]Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;[2]College of Forestry,Beijing Forestry University,Beijing 100083,China;[3]Graduate School of Chinese Academy of Sciences,Beijing 100049,China;[4]Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China

出　　处：《Science China Earth Sciences》索引2008年第51卷第7期,共11页

基　　金：the National Key Basic Research Special Foundation of China (Grant No. 2002CB4125);International Joint Research Project under Ministry of Science and Technology of China (Grant No. 2006DFB91920) 摘　　要：Based on the stem analysis of 59 individuals of Pinus elliottii in combination with tree biomass models, we calculated annual biomass increment of forest plots at Qianyanzhou Ecological Station, Chinese Academy of Sciences in subtropical China. In addition, canopy layer and community NPP were calcu- lated based on 12 years’ litter fall data. NPP of the 21-year-old forest was estimated by using the BIOME BGC model; and both measured NPP and estimated NPP were compared with flux data. Community biomass was 10574 g·m-2; its distribution patterns in tree layer, shrub layer, herbaceous layer, tree root, herbaceous and shrub roots and fine roots were 7542, 480, 239, 1810, 230, 274 and 239 g·m-2, respectively. From 1999 to 2004, the average annual growth rate and litter fall were 741 g·m-2·a-1 (381.31 gC·m-2·a-1) and 849 g·m?2·a?1 (463 gC·m-2·a-1), respectively. There was a significant corre- lation between annual litter fall and annual biomass increment; and the litter fall was 1.19 times the biomass increment of living trees. From 1985 to 2005, average NPP and GPP values based on BGC modeling were 630.88 (343.31 - 906.42 gC·m-2·a-1) and 1 800 gC·m-2·a-1 (1351.62 - 2318.26 gC·m-2·a-1). Regression analysis showed a linear relationship (R2=0.48) between the measured and simulated tree layer NPP values. NPP accounted for 30.2% (25.6%-32.9%) of GPP, while NEP ac- counted for 57.5% (48.1%-66.5%) of tree-layer NPP and 41.74% (37%-52%) of stand NPP. Soil respi- ration accounted for 77.0% of measured tree NPP and 55.9% of the measured stand NPP. NEE based on eddy covariance method was 12.97% higher than the observed NEP. 关键词：NPP BGC LITTER ANNUAL biomass INCREMENT FLUX

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Observation and modeling of NPP for Pinus elliottii plantation in subtropical China

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