Influence of Nitrogen Addition on Net Ecosystem Carbon Exchange of Steppe in the Loess Plateau

doi:10.7522/j.issn.1000-694X.2018.00055

Journal of Desert Research ›› 2019, Vol. 39 ›› Issue (3): 34-40.DOI: 10.7522/j.issn.1000-694X.2018.00055

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Influence of Nitrogen Addition on Net Ecosystem Carbon Exchange of Steppe in the Loess Plateau

Wen Haiyan, Wu Shujuan, Fu Hua

College of Pastoral Agriculture Science and Technology/State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou University, Lanzhou 730020, China

Received:2017-11-07 Revised:2018-05-17 Published:2019-06-10

Abstract

Abstract: The static chamber and infrared analyzer were used to investigate the effect of increased nitrogen (N) deposition on ecosystem carbon (C) exchange, and a field experiment that simulated N deposition was conducted in a steppe located in the Loess Plateau. There were six N treatments included in the experiment: 0, 1.15, 2.3, 4.6, 9.2 and 13.8 gN·m^-2·a^-1 with (NH₂)₂CO. The results indicated that the N treatments did not change the seasonal patterns of ecosystem C exchange, but increased the peak values of net ecosystem exchange (NEE), ecosystem respiration (ER), and general ecosystem production (GEP). The seasonal accumulation of NEE under 2.3, 4.6, 9.2 and 13.8 gN·m^-2·a^-1 N treatments increased by 62%, 45% ,72% and 48%, respectively, while the seasonal accumulation of ER increased by 66%, 69%, 78% and 70%, and GEP by 65%, 66%, 77% and 68%, compared with the control treatment. Therefore, the N treatments could significantly reduce C sequestration in the typical steppe of the Loess Plateau. Soil temperature and soil moisture in the 0-10 cm soil layer were the most important factors affecting ecosystem C exchange.

Key words: nitrogen addition, steppe, NEE, Loess Plateau

CLC Number:

S812.4

Wen Haiyan, Wu Shujuan, Fu Hua. Influence of Nitrogen Addition on Net Ecosystem Carbon Exchange of Steppe in the Loess Plateau[J]. Journal of Desert Research, 2019, 39(3): 34-40.

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Influence of Nitrogen Addition on Net Ecosystem Carbon Exchange of Steppe in the Loess Plateau

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