川中丘陵区旱地小麦生态系统CO_2、N_2O和CH_4排放特征  

CO_2,N_2O and CH_4 emission from dry-land wheat ecosystem in hilly area of central Sichuan Basin.

作　　者：张中杰[1] 朱波[1] 江长胜[2] 韩广轩[1] 高美荣[1] 

机构地区：[1]中国科学院成都山地灾害与环境研究所 [2]中国科学院大气物理研究所,北京100029

出　　处：《生态学杂志》2005年第2期131-135,共5页Chinese Journal of Ecology

基　　金：中国科学院知识创新工程重大项目 (KZCX1-SW -0 1-0 1B);国家自然科学基金重点资助项目 (4 0 3 3 10 14 )。

摘　　要：利用静态箱 /气相色谱法观测川中丘陵旱地小麦生态系统CO2 、N2 O和CH4的排放通量。结果表明 ,旱地小麦CO2 、N2 O和CH4排放具有明显的日变化和季节变化特征。在小麦的整个生长季中 ,常规、无氮、空白、裸地等实验处理的CO2 、N2 O和CH4的排放通量具有显著差异。CO2 排放通量表现为常规 >空白 >裸地 ,CO2 日最高排放值在每日 1 3:0 0～ 1 5 :0 0时出现 ,最低排放值出现在凌晨 3:0 0～6 :0 0 ,且作物的不同生长季CO2 排放通量具有一定的差异。在小麦生长季中 ,N2 O通量排放呈递增趋势 ,N2 O排放通量表现为常规 >空白 >裸地。旱地小麦CH4通量排放和温度、湿度等环境因子不具有显著的相关性 ,排放无规律。CO_2,N_2O and CH_4 emission from dry-land wheat ecosystem were measured by static chamber-gas chromatographic techniques in hilly area of central Sichuan Basin. The results showed that CO_2,N_2O and CH_4 emission from wheat ecosystem changed remarkably daily and seasonally. During the whole growth stage of wheat,CO_2,N_2O and CH_4 emission fluxes in different experimental treatments had significant differences. The maximal daily emission flux of CO_2 appeared at 1:00～3:00 p.m.,and the minimum volume appeared at 3:00～6:00 a.m.The emission fluxes of CO_2 were different during the growth stages of wheat. N_2O emission increased with wheat growth.Meanwhile,N_2O was emitted as follow:general nitrogen fertilizer application > no nitrogen fertilizer application > bare land. The maximal and the minimum daily changing of N_2O emerged at different time in the different growing stage. The change of CH_4 volume from dry-land wheat was not obviously related to temperature,humidity and other environmental factors.It showed that the CH_4 emission was no regular.

关 键 词：川中丘陵区 旱地 温室气体 小麦 

分 类 号：S154.4[农业科学—土壤学]