Chin J Plant Ecol ›› 2021, Vol. 45 ›› Issue (4): 334-344.DOI: 10.17521/cjpe.2020.0277
Special Issue: 碳循环
• Research Articles • Previous Articles Next Articles
LÜ Ya-Xiang1,2, QI Zhi-Yan1,2, LIU Wei1, SUN Jia-Mei1,*(), PAN Qing-Min1,2
Received:
2020-08-11
Accepted:
2020-11-12
Online:
2021-04-20
Published:
2021-03-27
Contact:
SUN Jia-Mei
Supported by:
LÜ Ya-Xiang, QI Zhi-Yan, LIU Wei, SUN Jia-Mei, PAN Qing-Min. Effects of nitrogen and phosphorus addition at early-spring and middle-summer on ecosystem carbon exchanges of a degraded community in Nei Mongol typical steppe[J]. Chin J Plant Ecol, 2021, 45(4): 334-344.
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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2020.0277
Fig. 1 A conceptual framework illustrating interactive effects between nitrogen and phosphorus on parameters of carbon exchanges. N, effect of nitrogen on parameters of carbon exchanges under the scenario of only nitrogen addition; P, effect of phosphorus on parameters of carbon exchanges under the scenario of only phosphorus addition. NNP, effect of nitrogen on parameters of carbon exchanges under the scenario of nitrogen and phosphorus co-addition;NP, co-effect of nitrogen and phosphorus on parameters of carbon exchanges under the scenario of nitrogen and phosphorus co-addition; PNP, effect of phosphorus on parameters of carbon exchanges under the scenario of nitrogen and phosphorus co-addition.
Fig. 3 Effects of timing of nitrogen and phosphorus addition on net ecosystem carbon exchange (NEE, A), ecosystem respiration (ER, B) and gross ecosystem productivity (GEP, C)(mean ± SE). Different lowercase letters indicate significant difference between treatments of nutrient addition at the same date (p < 0.05). CK, control ((0 g N +0 g P)·m -2·a-1); N, nitrogen addition at a rate of 10.5 g·m-2·a-1; P, phosphorus addition at the rate of 7 g·m-2·a-1; NP, nitrogen in combination with phosphorus addition at the rates of 10.5 and 7 g·m-2·a-1, respectively.
Fig. 4 Nitrogen (N)-induced changes in net ecosystem carbon exchange (NEE, A), ecosystem respiration (ER,B) and gross ecosystem productivity (GEP, C) with and without phosphorus (P) fertilization, and P-induced changes in NEE (D), ER(E) and GEP (F) with and without N fertilization (mean ± SE). **, p < 0.01; ***, p < 0.001; ns, p> 0.05.
Fig. 5 Net ecosystem carbon exchange (NEE, A, D), ecosystem respiration (ER, B, E) and gross ecosystem productivity (GEP, C, F) in relation to soil temperature and soil moisture.
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