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Forests 2017, 8(10), 379; https://doi.org/10.3390/f8100379

Carbon Dioxide Fluxes and Their Environmental Controls in a Riparian Forest within the Hyper-Arid Region of Northwest China

1
Northwest Institute of Eco-Environment and Resources, CAS, Lanzhou 730000, China
2
Key Laboratory of Eco-hydrology of Inland River Basin, CAS, Lanzhou 730000, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
4
School of Agricultural, Computational and Environmental Sciences, Institute of Agriculture and Environment (I Ag&E), University of Southern Queensland, Springfield, Queensland 4300, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Timothy A. Martin
Received: 3 July 2017 / Revised: 27 September 2017 / Accepted: 28 September 2017 / Published: 4 October 2017
(This article belongs to the Section Forest Ecology and Management)
Full-Text   |   PDF [3086 KB, uploaded 11 October 2017]   |  

Abstract

Hyper-arid regions are expected to undergo climatic change, but only a few research works have so far been conducted on the dynamics of carbon dioxide (CO2) fluxes and their consequent responses to various bioclimatic factors, which is mainly attributable to a limited set of flux observations. In this study, the CO2 fluxes exchanged between the forest and the atmosphere have been measured continuously by the eddy covariance approach from June 2013 to December 2016 in a riparian forest, which is a primary body of natural oases located within the lower reaches of inland rivers in China. The present results revealed that the climatic conditions characterized by relatively high mean air temperatures (Ta) with fluctuating annual precipitation (P) during the prescribed study periods were comparable to the historical mean value. The annual net ecosystem productivity (NEP) ranged from approximately 278 g C m−2 year−1 to 427 g C m−2 year−1, with a mean value of 334 g C m−2 year−1. The mean annual ecosystem respiration (Re) and the gross primary productivity (GPP) were found to be 558 and 892 g C m−2 year−1, respectively. The results also ascertained that the high inter-annual variations in NEP were attributable to Re rather than to GPP, and this result was driven primarily by Ta and the groundwater depth under similar eco-physiological processes. In addition, the CO2 fluxes were also strongly correlated with the soil temperature and photosynthetically active radiation for the present study site. In conclusion, the desert riparian forest is a considerably significant carbon sink, particularly in the hyper-arid regions. View Full-Text
Keywords: carbon fluxes; desert riparian forest; groundwater depth; climatic control carbon fluxes; desert riparian forest; groundwater depth; climatic control
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Ma, X.; Feng, Q.; Yu, T.; Su, Y.; Deo, R.C. Carbon Dioxide Fluxes and Their Environmental Controls in a Riparian Forest within the Hyper-Arid Region of Northwest China. Forests 2017, 8, 379.

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