黄土高原半干旱区净碳交换量的特征分析  

Characteristics of Net Carbon Exchange over the Semi-arid Loess Plateau in Northwest China

作　　者：药静宇 王国印[1] 黄建平[1] 闭建荣[1] 

机构地区：[1]兰州大学大气科学学院,半干旱气候变化教育部重点实验室,甘肃兰州730000

出　　处：《干旱气象》2016年第1期88-95,共8页Journal of Arid Meteorology

基　　金：国家重大科学研究计划项目(2012CB955302);国家自然科学基金项目(4140050023);兰州大学中央高校基本科研业务费专项资金(lzujbky-2014-102)共同资助

摘　　要：利用涡动相关技术对黄土高原半干旱区SACOL站2007-2012年连续6 a的CO2通量进行观测,并结合气象观测数据,分析兰州大学半干旱气候与环境观测站（SACOL站）净生态系统碳交换量（NEE）的变化特征以及环境影响因子。结果表明：（1）黄土高原半干旱区SACOL站NEE年累积平均值为-214.50±43 gC/m^2,其中生长季节累积平均值为-171.58±41 gC/m^2,非生长季节累积平均值为-42.92±5 gC/m^2;（2）SACOL站NEE的日变化呈＂U＂型,净辐射是影响NEE日变化的主要因子。NEE日平均值为-1.15 gC/m^2,表现为明显的CO2吸收,即黄土高原半干旱区是重要的碳汇区;（3）NEE值有明显的年际差异和季节变化特征,生长季节比非生长季节变化幅度大;NEE在生长季节主要受到土壤湿度的影响,而土壤温度会影响非生长季节NEE的变化。Based on the continuous observation data of carbon dioxide flux using eddy covariance technique（ ECT） at the Semi- Arid Climate and Environment Observatory of Lanzhou University（ SACOL） during 2007- 2012,and combined meteorological observations,the variation characteristics of net ecosystem carbon exchange（ NEE） and environment factors influencing NEE there were analyzed.Results are as follows：（ 1） The annual cumulative average NEE value at SACOL was- 214. 50 ± 43 gC/m^2,thereinto,- 171. 58 ± 41 gC/m^2 during growing season,and- 42. 92 ± 5 gC/m^2 during non- growing season.（ 2） The diurnal variation curve of NEE at SACOL presented an asymmetrical U shape,and net radiation was the main influencing factor. The SACOL was an obvious sink of carbon with daily average NEE value of- 1. 15 gC/m^2.（ 3） The variation of carbon dioxide flux showed significant seasonal and interannual differences. The amplitude of variation was bigger in growing season,which was affected by soil conditions.

关 键 词：黄土高原半干旱区 净生态系统碳交换 净辐射 土壤湿度 

分 类 号：X171[环境科学与工程—环境科学]