Nitrogen enrichment suppresses revegetated shrub growth under increased precipitation via herb-induced topsoil water limitation in a desert ecosystem in northern China
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Background and aims
Revegetated woody plant communities are widely distributed in degraded drylands, and they are expected to be intrinsically sensitive to precipitation change and nitrogen enrichment. However, the interactive effects of precipitation and nitrogen on them remain largely unknown. This study aimed to examine how revegetated plant community responds to an increase in precipitation and nitrogen enrichment.
We conducted a field experiment over three years in a revegetated Artemisia ordosica shrubland in the Mu Us Desert of northern China, and investigated the effects of water and nitrogen addition on plant growth and soil resource availability.
Increased precipitation and nitrogen enrichment dramatically promoted herb growth. Increased precipitation significantly increased shrub productivity without fertilization, whereas nitrogen enrichment weakened shrub growth under increased precipitation. Nitrogen enrichment significantly reduced topsoil moisture and offset water stress alleviation under increased precipitation. Structural equation modeling revealed that nitrogen-enhanced herb growth caused topsoil moisture to decline, potentially weakening shrub growth under increased precipitation.
The results suggest that nitrogen enrichment tends to suppress shrub growth under increased precipitation due to herb-induced topsoil water limitation. Our findings provide empirical evidence that water competition from herbaceous plants negatively affect shrub growth under nitrogen enrichment, and highlight the plant-water interaction underlying the responses of desert shrubland to global environmental changes.
KeywordsCommunity composition Environmental changes Mu Us Desert Revegetation Shrubland
This study was jointly supported by the Fundamental Research Funds for the Central Universities (BLX201815, 2015ZCQ-SB-02), the National Natural Science Foundation of China (31470711), and the National Key Research and Development Program of China (2016YFC0500905). We thank Shijun Liu, Zhen Liu, Jing Zheng, Liang Liu, and the staff of the Yanchi Research Station for providing assistance with field and laboratory work. The authors declare no conflict of interest.
- Bai YF, Wu JG, Clark CM, Naeem S, Pan QM, Huang JH, Zhang LX, Han XG (2010) Tradeoffs and thresholds in the effects of nitrogen addition on biodiversity and ecosystem functioning: evidence from inner Mongolia grasslands. Glob Chang Biol 16:358–372. https://doi.org/10.1111/j.1365-2486.2009.01950.x CrossRefGoogle Scholar
- Bobbink R, Hicks K, Galloway J, Spranger T, Alkemade R, Ashmore M, Bustamante M, Cinderby S, Davidson E, Dentener F, Emmett B, Erisman JW, Fenn M, Gilliam F, Nordin A, Pardo L, De Vries W (2010) Global assessment of nitrogen deposition effects on terrestrial plant diversity: a synthesis. Ecol Appl 20:30–59. https://doi.org/10.1890/08-1140.1 CrossRefPubMedGoogle Scholar
- Collins SL, Belnap J, Grimm NB, Rudgers JA, Dahm CN, D'Odorico P, Litvak M, Natvig DO, Peters DC, Pockman WT, Sinsabaugh RL, Wolf BO (2014) A multiscale, hierarchical model of pulse dynamics in arid-land ecosystems. Annu Rev Ecol Evol Syst 45:397–419. https://doi.org/10.1146/annurev-ecolsys-120213-091650 CrossRefGoogle Scholar
- Cowie AL, Penman TD, Gorissen L, Winslow MD, Lehmann J, Tyrrell TD, Twomlow S, Wilkes A, Lal R, Jones JW, Paulsch A, Kellner K, Akhtar-Schuster M (2011) Towards sustainable land management in the drylands: scientific connections in monitoring and assessing dryland degradation, climate change and biodiversity. Land Degrad Dev 22:248–260. https://doi.org/10.1002/ldr.1086 CrossRefGoogle Scholar
- IPCC (2013) Climate change 2013: the physical science basis. Contribution of working group I to the fifth assessment report of the intergovernmental panel on climate change. UK, CambridgeGoogle Scholar
- Lan Z, Bai Y (2012) Testing mechanisms of N-enrichment-induced species loss in a semiarid Inner Mongolia grassland: critical thresholds and implications for long-term ecosystem responses. Philos Trans R Soc Lond Ser B Biol Sci 367:3125–3134. https://doi.org/10.1098/rstb.2011.0352 CrossRefGoogle Scholar
- Maestre FT, Eldridge DJ, Soliveres S, Kefi S, Delgado-Baquerizo M, Bowker MA, Garcia-Palacios P, Gaitan J, Gallardo A, Lazaro R, Berdugo M (2016) Structure and functioning of dryland ecosystems in a changing world. Annu Rev Ecol Evol Syst 47:215–237. https://doi.org/10.1146/annurev-ecolsys-121415-032311 CrossRefPubMedPubMedCentralGoogle Scholar
- Noy-Meir I (1973) Desert ecosystems: environment and producers. Annu Rev Ecol Syst 4:25–51. https://doi.org/10.1146/annurev.es.04.110173.000325 CrossRefGoogle Scholar
- Oñatibia GR, Aguiar MR, Cipriotti PA, Troiano F (2010) Individual plant and population biomass of dominant shrubs in Patagonian grazed fields. Ecol Austral 20:269–279Google Scholar
- R Core Team (2016) R: a language and environment for statistical computing. R Foundation for Statistical Computing, ViennaGoogle Scholar
- Revelle W (2016) Psych: procedures for personality and psychological research. Northwestern University, Evanston, USAGoogle Scholar
- Reynolds JF, Smith DM, Lambin EF, Turner BL 2nd, Mortimore M, Batterbury SP, Downing TE, Dowlatabadi H, Fernandez RJ, Herrick JE, Huber-Sannwald E, Jiang H, Leemans R, Lynam T, Maestre FT, Ayarza M, Walker B (2007) Global desertification: building a science for dryland development. Science 316:847–851. https://doi.org/10.1126/science.1131634 CrossRefGoogle Scholar
- Schlaepfer DR, Bradford JB, Lauenroth WK, Munson SM, Tietjen B, Hall SA, Wilson SD, Duniway MC, Jia G, Pyke DA, Lkhagva A, Jamiyansharav K (2017) Climate change reduces extent of temperate drylands and intensifies drought in deep soils. Nat Commun 8:14196. https://doi.org/10.1038/ncomms14196 CrossRefPubMedPubMedCentralGoogle Scholar
- Song M-H, Yu F-H, Ouyang H, Cao G-M, Xu X-L, Cornelissen JHC (2012) Different inter-annual responses to availability and form of nitrogen explain species coexistence in an alpine meadow community after release from grazing. Glob Chang Biol 18:3100–3111. https://doi.org/10.1111/j.1365-2486.2012.02738.x CrossRefPubMedGoogle Scholar
- Tietjen B, Schlaepfer DR, Bradford JB, Lauenroth WK, Hall SA, Duniway MC, Hochstrasser T, Jia G, Munson SM, Pyke DA, Wilson SD (2017) Climate change-induced vegetation shifts lead to more ecological droughts despite projected rainfall increases in many global temperate drylands. Glob Chang Biol 23:2743–2754. https://doi.org/10.1111/gcb.13598 CrossRefPubMedGoogle Scholar
- Tilman D, Isbell F, Cowles JM (2014) Biodiversity and ecosystem functioning. Annu Rev Ecol Evol Syst 45:471–493. https://doi.org/10.1146/annurev-ecolsys-120213-091917 CrossRefGoogle Scholar
- Walter H, Mueller-Dombois D (1971) Ecology of tropical and subtropical vegetation. Oliver & Boyd EdinburghGoogle Scholar
- Xu W, Luo XS, Pan YP, Zhang L, Tang AH, Shen JL, Zhang Y, Li KH, Wu QH, Yang DW, Zhang YY, Xue J, Li WQ, Li QQ, Tang L, Lu SH, Liang T, Tong YA, Liu P, Zhang Q, Xiong ZQ, Shi XJ, Wu LH, Shi WQ, Tian K, Zhong XH, Shi K, Tang QY, Zhang LJ, Huang JL, He CE, Kuang FH, Zhu B, Liu H, Jin X, Xin YJ, Shi XK, Du EZ, Dore AJ, Tang S, Collett JL, Goulding K, Sun YX, Ren J, Zhang FS, Liu XJ (2015) Quantifying atmospheric nitrogen deposition through a nationwide monitoring network across China. Atmos Chem Phys 15:12345–12360. https://doi.org/10.5194/acp-15-12345-2015 CrossRefGoogle Scholar
- Yahdjian L, Sala OE (2006) Vegetation structure constrains primary production response to water availability in the Patagonian steppe. Ecology 87:952–962. https://doi.org/10.1890/0012-9658(2006)87[952:VSCPPR]2.0.CO;2 CrossRefPubMedGoogle Scholar