广州市水稻作物生态系统碳汇功能  

Carbon Sink Function of Rice-crop Ecosystem in Guangzhou City

作　　者：何介南[1] 康文星[1] 

机构地区：[1]中南林业科技大学,长沙410004

出　　处：《中国农学通报》2010年第2期246-249,共4页Chinese Agricultural Science Bulletin

基　　金：湖南省自然科学基金项目(09JJ3031);广州市林业局重点项目(200506)

摘　　要：为研究广州市水稻作物生态系统对大气CO2的交换是碳源还是碳汇,依据广州市水稻作物系统的相关资料和实地观测数据,通过试验分析,并建立水稻作物系统固碳估算模型,估算了2005年广州市水稻作物生态系统的CO2吸收量和排放量。结果表明:2005年广州市水稻作物生态系统净生产力吸收CO2量为1 621 649 t/年,固定CO2能力为19.98 t/(hm2.年),其土壤CO2排放量(含CH4中的排C量)为1 168 625 t/年,单位面积CO2排放量为14.40 t/(hm2.年),吸收大于排放,系统净吸收CO2总量为453024 t/年。表明广州市水稻作物生态系统具有碳汇功能,其值为5.58 t/(hm2.年),是一个弱的碳汇。This article studied the carbon sink function of Rice-crop ecosystem in Guangzhou City based on experiments and establishing estimation model,according to spot observation data and related data with Rice-crop system in Guangzhou City.Results showed that： the CO2 absorb ability in Rice-crop ecosystem in Guangzhou City during 2005 net productivity process was 1 621 649 t/a,the amount of CO2 absorb per unit area was 19.98 t/（hm^2·a）;the amount of CO2 emission in the soil was 1 168 625t/a,the amount of CO2 emission per unit area was14.40 t/（hm^2·a）;less than the CO2 absorb ability;the amount of CO2 net absorption was 453 024 t/a,the Rice-crop ecosystem in Guangzhou City had carbon sink function,was 5.58 t/（hm^2·a）,and it was a weaker carbon sink process in the atmosphere.

关 键 词：碳汇功能 水稻作物 生态系统 广州市 

分 类 号：S181[农业科学—农业基础科学] S314