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采用涡度相关技术对欠雨年(2011年)和丰雨年(2012年)鄂尔多斯高原油蒿灌丛生态系统CO2交换量特征及其影响因子进行研究.结果表明:在两个不同降雨量年份,油蒿灌丛生态系统CO2交换量日动态根据CO2吸收峰值的出现分为两种模式,即单峰型和双峰型;2011年生长季内CO2通量共出现3个明显的吸收峰值和3个释放峰值,2012年生长季内CO2交换量出现4个吸收峰值和1个释放峰值;2011年6—9月,油蒿灌丛生态系统表现为弱的碳汇,10月转变为碳源;2012年整个生长季,油蒿灌丛生态系统均呈现为碳汇.丰雨年比欠雨年生长季的油蒿灌丛生态系统固碳量增加了268.90 mg CO2·m-2·s-1;在日尺度上,生态系统CO2交换量受光合有效辐射的控制,在生长季尺度上,非生物因素(降雨量、土壤含水量)和生物因素(生态系统净初级生产力)共同制约油蒿灌丛生态系统CO2交换量的变化.
The CO2 exchange characteristics of the Artemisia ordosica shrub ecosystem in the Ordos Plateau and its influencing factors were studied by using the eddy covariance technique in the years of rainy years (2011) and Feng’nan years (2012) .The results showed that in two different rainfall years , The daily dynamic of CO 2 exchange rate of Artemisia ordosica shrub ecosystem is divided into two modes according to the appearance of CO2 absorption peaks, that is, unimodal and bimodal types. There are three obvious absorption peaks of CO2 flux in the growing season in 2011 3 release peaks and 4 absorption peaks and 1 release peak in CO2 exchange during the growing season in 2012. The Artemisia ordosica shrub ecosystem showed weak carbon sink from June to September in 2011 and changed to carbon source in October And the ecosystem of Artemisia ordosica shrubs presented as carbon sink throughout the growing season in 2012. The carbon sequestration of Artemisia ordosica shrub ecosystem increased by 268.90 mg CO2 · m-2 · s- 1 On the daily scale, the amount of CO 2 exchanged by the ecosystem is controlled by photosynthetically active radiation. During the growing season, abiotic factors (rainfall, soil moisture content) and biological factors (ecosystem primary productivity) Changes of CO2 Exchange Volume in Shrub Ecosystem.