Soil respiration dynamics in a semi-fixed sand dune under the pioneer shrub Artemisia halodendron Turcz. ex Bess. in the Horqin sandy land, northeastern China. Issue 1 (2nd January 2020)

• Record Type: Journal Article
• Authors: Luo, Yongqing; Zhao, Xueyong; Ding, Jieping; Li, Yuqiang; Liu, Xinping; Wang, Tao; Luo, Yayong
• Is Part Of: Arid land research and management. Volume 34:Issue 1(2020)
• Page Start: 36
• Page End: 51
• Publication Date: 2020-01-02
• Subjects: Artemisia halodendron -- Horqin sandy land -- root contribution -- root respiration -- seasonal variation -- total soil respiration; Arid soils -- Periodicals; Arid regions agriculture -- Periodicals; Desert reclamation -- Periodicals; 631.47154
• DOI: 10.1080/15324982.2019.1629675
• Languages: English
• ISSNs: 1532-4982

Abstract

Abstract: Soil respiration is a major pathway by which carbon dioxide (CO2 ) fixed by terrestrial plants returns to the atmosphere. Studies of the dynamics of soil respiration in sandy land are rare and the contribution ( R c ) of plant root respiration to the total soil respiration ( R t ) is not well known. In this study, R t in a semi-fixed dune planted with Artemisia halodendron was separated into autotrophic (root) respiration ( R a ) and heterotrophic respiration ( R h ) by the root-exclusion method. R t and its two components were measured or calculated during 2013 on seven dates during the growing season when variation during the day was measured. Both R a and R h showed similar dynamics, with the maximum rates observed in July and with large daily variability observed on the earlier dates. R c ranged from 39.3% to 53.1% during the growing season and exhibited a single peak in early August. Soil temperature at a depth of 20 cm was significantly correlated with soil respiration. R a was more sensitive to soil temperature than R h and the temperature sensitivity coefficients ( Q 10 ) were 3.39, 2.52, and 2.79 for R a, R h, and R t, respectively. In summary, A. halodendron roots contributed an average of 46% to the total soil respiration, although this contribution varied during the growing season.