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231226s2023 xx |||||o 00| ||eng c |
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|a 10.1111/gcb.16803
|2 doi
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|a pubmed24n1192.xml
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|a (DE-627)NLM357673735
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|a (NLM)37265328
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Yang, Guo-Jiao
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Different nitrogen saturation thresholds for above-, below-, and total net primary productivity in a temperate steppe
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|c 2023
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 17.07.2023
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|a Date Revised 16.11.2023
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2023 John Wiley & Sons Ltd.
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|a Identifying the thresholds for the positive responses of total net primary productivity (NPP) to nitrogen (N) enrichment is an essential prerequisite for predicting the benefits of N deposition on ecosystem carbon sequestration. However, the responses of below-ground NPP (BNPP) to N enrichment are unknown in many ecosystems, which limits our ability to understand the carbon cycling under the scenario of increasing N availability. We examined the changes in above-ground NPP (ANPP), BNPP, and NPP of a temperate meadow steppe across a wide-ranging N addition gradient (0, 2, 5, 10, 20, and 50 g N m-2 year-1 ) during 5 years. Both ANPP and NPP increased nonlinearly with N addition rates. The N saturation threshold for ANPP (TA ) and NPP (TN ) was at the rate of 13.11 and 6.70 g N m-2 year-1 , respectively. BNPP decreased with increasing N addition when N addition rates ˃5 g N m-2 year-1 , resulting in much lower TN than TA . Soil N enrichment played a key role in driving the negative impacts of high N addition rates on BNPP, and consequently on the earlier occurrence of N saturation threshold for NPP. Our results highlight the negative effects of soil N enrichment on NPP in natural grasslands super-saturated with N. Furthermore, by considering ANPP and BNPP simultaneously, our results indicate that previous findings from above-ground might have over-estimated the positive effects of N deposition on primary productivity
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|a Journal Article
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|a N saturation threshold
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|a ammonium toxicity
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|a nitrogen deposition
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|a production
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|a semi-arid grassland
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|a soil N concentration
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|a Nitrogen
|2 NLM
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| 650 |
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|a N762921K75
|2 NLM
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| 650 |
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|a Soil
|2 NLM
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| 700 |
1 |
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|a Stevens, Carly
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhang, Zi-Jia
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Lü, Xiao-Tao
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Han, Xing-Guo
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Global change biology
|d 1999
|g 29(2023), 16 vom: 02. Aug., Seite 4586-4594
|w (DE-627)NLM098239996
|x 1365-2486
|7 nnns
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| 773 |
1 |
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|g volume:29
|g year:2023
|g number:16
|g day:02
|g month:08
|g pages:4586-4594
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|u http://dx.doi.org/10.1111/gcb.16803
|3 Volltext
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