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J Integr Plant Biol, 2003, 45 (5): 552-560, Research Article
Interannual Variation in Terrestrial Ecosystem Carbon Fluxes in China from 1981 to 1998
CAO Ming-Kui, TAO Bo, LI Ke-Rang, SHAO Xue-Mei, Stephen D PRIENCE
doi:
Abstract

A dynamic biogeochemical model was used to estimate the responses of China''s terrestrial net primary productivity (NPP), soil heterotrophic respiration (HR) and net ecosystem productivity (NEP) to changes in climate and atmospheric CO2 from 1981 to 1998. Results show that China''s total NPP varied between 2.89 and 3.37 Gt C/a and had an increasing trend by 0.32% per year, HR varied between 2.89 and 3.21 Gt C/a and grew by 0.40% per year, Annual NEP varied between -0.32 and 0.25 Gt C but had no statistically significant interannual trend. The positive mean NEP indicates that China''s terrestrial ecosystems were taking up carbon with a total carbon sequestration of 1.22 Gt C during the analysis period. The terrestrial NEP in China related to climate and atmospheric CO2 increases accounted for about 10% of the world''s total and was similar to the level of the United States in the same period. The mean annual NEP for the analysis period was near to zero for most of the regions in China, but significantly positive NEP occurred in Northeast China Plain, the southeastern Xizang (Tibet) and Huang-Huai-Hai Plain, and negative NEP occurred in the Da Hinggan Mountains, Xiao Hinggan Mountains,Loess Plateau and Yunnan-Guizhou Plateau. China''s climate at the time was warm and dry relative to other periods, so the estimated NEP is probably lower than the average level. China''s terrestrial NEP may increase if climate becomes wetter but is likely to continue to decrease if the present warming and drying trend sustains.

1981-2000年中国陆地生态系统碳通量的年际变化
曹明奎  陶 波 李克让 邵雪梅 Stephen D PRIENCE2
(1. 中国科学院地理科学与资源研究所,北京100101;2. 马里兰大学地理系,美国20742)

摘要:应用一个生物地球化学模型(CEVSA)估算了中国陆地净初级生产力 (NPP)、土壤异养呼吸(HR)和净生态系统生产力 (NEP) 在1981~1998年期间对气候和大气CO2浓度变化的动态响应.结果显示,全国NPP总量波动于2.89~3.37 Gt C/a之间,平均值为3.09 Gt C/a,年平均增长趋势约为0.32%.HR总量变化范围为2.89~3.21 Gt C/a,平均值为3.02 Gt C/a, 年均增长0.40%.NEP总量变动于 -0.32和0.25 Gt C/a之间,在统计上没有明显的年际变化趋势.在研究时段内,年平均NEP约为0.07 Gt C/a,表明中国陆地生态系统在气候与大气CO2浓度变化的条件下吸收了碳,为碳汇,总的吸收量为1.22 Gt C,约占全球碳吸收总量的10%,与同期内美国由大气CO2和气候变化所产生的碳吸收量大致相当.尽管由于较高的年际变率,NEP在统计上没有明显的变化趋势,但NPP的增长率低于HR的增长率,说明在研究时段内,中国陆地生态系统的吸碳能力由于气候变化降低了.全国大多数地区年平均NEP接近零,明显的NEP正值区(即碳汇)出现在东北平原、西藏东南部和黄淮平原等地区,而大小兴安岭、黄土高原和云贵高原等地区NEP为负值(即碳源).研究认为,1981~1998年期间中国气候温暖、干旱,因此估算的NEP可能低于其他时段.如果气候进入一个比较湿润的时期,碳吸收量可显著增加,但若当前干旱和暖化趋势以此为继,中国的NEP可能会变成一个负值。

关键词: 中国;净初级生产力;土壤异养呼吸;净生态系统生产力;气候变化

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