Leaf P increase outpaces leaf N in an Inner Mongolia grassland over 27 years

Mi, Zhaorong; Huang, Yuanyuan; Gan, Huijie; Zhou, Wenjia; Flynn, Dan F. B.; He, Jin‐Sheng

doi:10.1098/rsbl.2014.0981

Cited by 15 publications

(9 citation statements)

References 21 publications

(29 reference statements)

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“…The increasing soil N observed in this study (Figure 3a) is consistent with observations from plant leaves, in which N concentration has been reported to have significantly increased over the recent decades [Huang et al, 2012;Liu et al, 2013;Mi et al, 2015]. These two lines of evidence suggest that N concentration in both soils and leaves have changed considerably in recent decades.…”

Section: 1002/2016jg003352supporting

confidence: 91%

Dynamic patterns of nitrogen: Phosphorus ratios in forest soils of China under changing environment

2016

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Knowledge of nitrogen (N) and phosphorus (P) stoichiometry is essential for understanding biogeochemical cycle and ecosystem functioning. However, large‐scale patterns in soil stoichiometry are not yet fully understood along environmental gradients nor over the temporal scale. Using a comprehensive data set and artificial neural network approach, we evaluated spatial and temporal patterns in topsoil N and P concentrations and N:P ratio across China's forests. Our results revealed that soil weathering stage, climatic factors (i.e., temperature and precipitation), and forest types jointly explained approximately 34.1% and 30.4% of spatial variations in soil N and P, respectively. By contrast, only precipitation could explain the variation in N:P ratio, with soil N:P ratio exhibiting a trend of increase along the precipitation gradient. The observed spatial patterns in soil N:P ratio were consistent with previous findings derived from plants and microbes, suggesting that variation in precipitation may induce the imbalance of N:P stoichiometry in forest ecosystems. Our results also indicated that topsoil N:P ratios exhibited a significant increase from the 1980s to 2000s. However, the associations of N:P dynamics with a single element largely depended on forest type. In evergreen forests, soil N:P dynamics were caused by increasing N and decreasing P. Conversely, N:P changes in deciduous broadleaf forests were triggered only by soil N accumulation. Overall, these results demonstrated a stoichiometric shift in soil N:P both spatially and temporally, implying that nutrient imbalance between soil N and P may be accelerated under global change scenarios.

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Section: 1002/2016jg003352supporting

confidence: 91%

Dynamic patterns of nitrogen: Phosphorus ratios in forest soils of China under changing environment

2016

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“…There were two likely processes that may influence P concentration in L. davurica , as its proportion decreased in the mixtures: the first was that P fertilization tended to increase P availability, and the second was that limited P resources from fertilizer and soil was equally used by each single plant of L. davurica . Therefore, the increased numbers in the mixtures would decrease the P reallocation, limiting plant P uptake and P concentration in organs of L. davurica ( Mi et al, 2015 ). Similar results were reported for the soybean-citrus intercropping, where P uptake and distribution amongst the organs of soybean decreased compared with their respective monoculture ( Zhou et al, 2006 ).…”

Section: Discussionmentioning

confidence: 99%

Accumulation of N and P in the Legume Lespedeza davurica in Controlled Mixtures with the Grass Bothriochloa ischaemum under Varying Water and Fertilization Conditions

Chen

et al. 2018

Front. Plant Sci.

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Water and fertilizers affect the nitrogen (N) and phosphorus (P) acquisition and allocation among organs in dominant species in natural vegetation on the semiarid Loess Plateau. This study aimed to clarify the N and P accumulation and N:P ratio at organ and plant level of a local legume species mixed with a grass species under varying water and fertilizer supplies, and thus to fully understand the requirements and balance of nutrient elements in response to growth conditions change of native species. The N and P concentration in the organ (leaf, stem, and root) and plant level of Lespedeza davurica (C3 legume), were examined when intercropped with Bothriochloa ischaemum (C4 grass). The two species were grown outdoors in pots under 80, 60, and 40% of soil water field capacity (FC), -NP, +N, +P, and +NP supply and the grass:legume mixture ratios of 2:10, 4:8, 6:6, 8:4, 10:2, and 12:0. The three set of treatments were under a randomized complete block design. Intercropping with B. ischaemum did not affect N concentrations in leaf, stem and root of L. davurica, but reduced P concentration in each organ under P fertilization. Only leaf N concentration in L. davurica showed decreasing trend as soil water content decreased under all fertilization and mixture proportion treatments. Stems had the lowest, while roots had the highest N and P concentration. As the mixture proportion of L. davurica decreased under P fertilization, P concentration in leaf and root also decreased. The N concentration in L. davurica at the whole plant level was 11.1–17.2%. P fertilization improved P concentration, while decreased N:P ratio in L. davurica. The N:P ratios were less than 14.0 under +P and +NP treatments. Our results implied that exogenous N and P fertilizer application may change the N:P stoichiometry and influence the balance between nutrients and organs of native dominant species in natural grassland, and P element should be paid more attention when considering rehabilitating degraded grassland via fertilization application in semiarid Loess Plateau region.

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“…Although leaf C and leaf N increased with increase of leaf P in response to grazing for both dominant and rare species (Klein et al 2007, Mi et al 2015Niu et al, unpublished manuscript), increases in leaf C and N in dominant species are small compared to the increases in rare species, which results in convergence of leaf C and N among occurring species (Figs. 2A, B and 3).…”

Section: Discussionmentioning

confidence: 99%

The effects of grazing on foliar trait diversity and niche differentiation in Tibetan alpine meadows

Niu

Messier

et al. 2015

Ecosphere

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Citation: Niu, K., J. Messier, J.-S. He, and M. J. Lechowicz. 2015. The effects of grazing on foliar trait diversity and niche differentiation in Tibetan alpine meadows. Ecosphere 6(9):150. http://dx.doi.org/10.1890/ES14-00547.1Abstract. Niche differentiation arising in functional trait diversity is expected to increase the potential for species coexistence, but empirical evidence for these relationships is sparse. We test whether grazing increases the functional diversity of leaf traits and niche differentiation in phosphorus limited Tibetan alpine meadows. We measured five traits in the leaf economic spectrum (LES; LC, leaf carbon concentration; LN, leaf nitrogen concentration; LP, leaf phosphorus concentration; SLA, specific leaf area; and LDMC, leaf dry matter content) for all species occurring in grazed and ungrazed plots at each of five sites. By comparing indicators of the fundamental and realized niches of co-occurring plants in both grazed and ungrazed plots, we quantified a grazing-mediated competitive effect on trait divergence and convergence. This trait response reflects the relative importance of niche differentiation and competitive exclusion in response to grazing. We found that while grazing induced LP divergence, both LC and LN tended to converge under grazing. Grazing had no effect on either SLA or LDMC diversity. When all five traits are considered together as a functionally integrated suite (LES hypervolume), there is no evidence for either divergence or convergence in response to grazing. Although grazing promotes functionally relevant diversity in LP that enables niche differentiation in competition for scarce soil available P, these results suggest that coordinated shifts in other LES traits sustain effective overall foliar function despite shifts in LP.

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Leaf P increase outpaces leaf N in an Inner Mongolia grassland over 27 years

Cited by 15 publications

References 21 publications

Dynamic patterns of nitrogen: Phosphorus ratios in forest soils of China under changing environment

Dynamic patterns of nitrogen: Phosphorus ratios in forest soils of China under changing environment

Accumulation of N and P in the Legume Lespedeza davurica in Controlled Mixtures with the Grass Bothriochloa ischaemum under Varying Water and Fertilization Conditions

The effects of grazing on foliar trait diversity and niche differentiation in Tibetan alpine meadows

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