摘要
应用生物地球化学模型BIOME-BGC模型估算了1993～2004年红壤丘陵区湿地松林总第一性生产力(GPP)、净第一性生产力(NPP),并分析GPP、NPP年际变化对气候的响应以及未来气候变化情景下GPP、NPP的响应。结果表明,湿地松林1993～2004年GPP、NPP的总量变化波动于1777～2160g Cm-2a-1之间和453～828gCm-2a-1之间,平均值分别为1941g Cm-2a-1和695gCm-2a-1。在研究时段内,GPP、NPP有缓慢增长趋势,GPP、NPP总量平均值从1990年代初期(1993～1996年)的1826、687gCm-2a-1上升到21世纪初期(2001～2004年)的2026、693gCm-2a-1。这主要是由于研究时段内GPP、NPP对降水缓慢增长的正响应造成的。未来气候变化情景分析表明,CO2浓度倍增不利于湿地松林GPP、NPP的增长,但均不超过1.5%。在CO2浓度不增加条件下,GPP正向响应了降水单独变化和温度升高1.5℃且降水增加情景,正向响应NPP的情景条件是降水的单独变化;当CO2浓度倍增和气候改变时,预测的GPP正向响应了降水的变化,同时正向响应了温度升高1.5℃且降水变化;正向响应NPP的情景条件是降水的变化。
In this study, we used a biogeochemical model, BIOME-BGC Primary Productivity ） and NPP （Net Primary Productivity ） of Pinus responses to interannual climate variability during the period of 1993 - Results showed that the average annual total GPP and NPP were 1 941g showed an increasing trend during the study period. The precipitation model, that was validated to estimate GPP （Gross elliottii forest in red soil hilly region and their 2004 and climate change scenario in the future. C m^-2a ^-1and695 gC m^-2a^-1 GPPand NPP was the key factor controlling the GPP and NPP variations. Scenario analysis showed that double CO2 would not benefit for GPP and NPP with less than 1.5% decrease When CO2 concentration fixed, GPP responded positively to precipitation change only, temperature increase by 1.5℃ while precipitation increase and NPP responded positively to climate changed, GPP and NPP responded positively precipitation change only. When CO2 concentration doubled and to precipitation changed and GPP also responded positively to temperature increased by 1.5℃ while precipitation changed.
出处
《生态学报》
CAS
CSCD
北大核心
2008年第11期5314-5321,共8页
Acta Ecologica Sinica
基金
国家重点基础研究发展规划资助项目(2002CB4125)
国家科技部国际合作资助项目(2006DFB91920)~~
