不同降雨量年份鄂尔多斯高原油蒿灌丛生态系统碳交换特征

应用生态学报

不同降雨量年份鄂尔多斯高原油蒿灌丛生态系统碳交换特征

高丽¹,董婷婷²,王育青^1**,闫志坚¹,宝音陶格涛²,王慧¹,戴雅婷¹

(¹中国农业科学院草原研究所, 呼和浩特 010010; ²内蒙古大学生命科学学院, 呼和浩特 010021)

出版日期:2014-08-18 发布日期:2014-08-18

Ecosystem carbon exchange in Artemisia ordosica shrubland of Ordos Plateau in two different precipitation years.

GAO Li¹, DONG Ting-ting², WANG Yu-qing¹, YAN Zhi-jian¹, BAOYIN Tao-ge-tao², WANG Hui¹, DAI Ya-ting^1

(¹Grassland Research Institute, Chinese Academy of Agricultural Sciences, Hohhot 010010, China; ²College of Life Science, Inner Mongolia University, Hohhot 010021, China)

Online:2014-08-18 Published:2014-08-18

摘要/Abstract

摘要：

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.

Abstract: Characteristics of ecosystem carbon exchange and its impact factors in Artemisia ordosica shrubland in 2011(low precipitation) and 2012(high precipitation), Ordos Plateau, were studied using eddy covariance methods. The results showed that the diurnal dynamics of ecosystem carbon exchange could be expressed as singlepeak and doublepeak curves in the two different precipitation years. In 2011, three carbon absorption peaks and three carbon release peaks of ecosystem carbon exchange presented in the growing season. In 2012, four carbon absorption peaks and one carbon release peak appeared in the growing season. The A. ordosica shrubland was a net carbon sink from June to September and a carbon source in October in 2011. In 2012, A. ordosica shrubland was a net carbon sink in the whole growing season. The amount of carbon fixed by A. ordosica shrubland in the growing season in 2012 was 268.90 mg CO₂·m^-2·s^-1 higher than that in 2011. The ecosystem carbon exchange of A. ordosica shrubland was controlled by PAR (photosynthetically active radiation) on the day scale, and affected by both abiotic (precipitation and soil water content) and biotic (aboveground net primary productivity) factors on the growing season scale.

高丽1,董婷婷2,王育青1**,闫志坚1,宝音陶格涛2,王慧1,戴雅婷1. 不同降雨量年份鄂尔多斯高原油蒿灌丛生态系统碳交换特征[J]. 应用生态学报.

GAO Li1, DONG Ting-ting2, WANG Yu-qing1, YAN Zhi-jian1, BAOYIN Tao-ge-tao2, WANG Hui1, DAI Ya-ting1. Ecosystem carbon exchange in Artemisia ordosica shrubland of Ordos Plateau in two different precipitation years.[J]. Chinese Journal of Applied Ecology.