Effects of N addition rates on the productivity of Picea Sitchensis, Thuja plicata, and Tsuga heterophylla seedlings

Brown, Kevin R.; Thompson, W. A.; Camm, Edith L.; Hawkins, Barbara J.; Guy, Robert D.

doi:10.1007/pl00009648

Cited by 33 publications

(42 citation statements)

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“…The absorption of plant roots to soil available N basically reached saturation point, thus N addition was not enough to change foliar N content in a short time. However, in the N-limited disturbed and rehabilitated forests where trees have a great demand for nitrogen , added N should promote the accumulation of foliar N. This was similar to many N-limited temperate forests (Brown et al 1996;Aber et al 1998;Nakaji et al 2002). In addition, the decline of foliar C/N ratio should contribute to the acceleration of litter decomposition after the leaves fell.…”

Section: Microbial Biomass C and Water Soluble Organic C In Surface Smentioning

confidence: 72%

“…2), which indicated that N availability had a positive effect on photosynthesis when foliar N was below the threshold (Sparks and Ehleringer 1997;Ripullone et al 2004). Brown et al (1996) reported that the photosynthetic rate of seedlings of Picea sitchensis, Thuja plicata and Tsuga heterophylla decreased when foliar N exceeded 21 mg g −1 . In Dinghushan reserve, Li et al (2004) also found that the net photosynthesis rate of Schima superba, Castanopsis chinensis and Cryptocarya concinna increased in low-N treatment and decreased in high-N treatment, and the critical level of N addition was 10 g N m −2 y −1 .…”

Section: Microbial Biomass C and Water Soluble Organic C In Surface Smentioning

confidence: 99%

“…In Dinghushan reserve, Li et al (2004) also found that the net photosynthesis rate of Schima superba, Castanopsis chinensis and Cryptocarya concinna increased in low-N treatment and decreased in high-N treatment, and the critical level of N addition was 10 g N m −2 y −1 . The decrease in net photosynthesis resulting from high N treatment was partially due to self-shedding of canopy (Brown et al 1996;Nakaji et al 2001) and nutrient imbalances (e.g. increasing N/base cations ratios and reducing Ca/Al ratios) (Nakaji et al 2002).…”

Section: Microbial Biomass C and Water Soluble Organic C In Surface Smentioning

confidence: 99%

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13C abundance, water-soluble and microbial biomass carbon as potential indicators of soil organic carbon dynamics in subtropical forests at different successional stages and subject to different nitrogen loads

Fang

Cheng

et al. 2009

Plant Soil

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Chronic atmospheric nitrogen deposition affects the cycling of carbon (C) and nitrogen (N) in forest ecosystems, and thereby alters the stable C isotopic abundance of plant and soil. Three successional stages, disturbed, rehabilitated and mature forests were studied for their responses to different nitrogen input levels. N-addition manipulative experiments were conducted at low, medium and high N levels. To study the responses of C cycling to N addition, the C concentration and 13 C natural abundances for leaf, litter and soil were measured. Labile organic carbon fractions in mineral soils were measured to quantify the dynamics of soil organic C (SOC). Results showed that three-year continuous N addition did not significantly increase foliar C and N concentration, but decreased C/N ratio and enriched 13 C in N-rich forests. In addition, N addition significantly decreased microbial biomass C, and increased water soluble organic C in surface soils of N-rich forests. This study suggests that N addition enhances the water consumption per unit C assimilation of dominant plant species, restricts SOC turnover in N-poor forests at early and medium successional stages (thus favored SOC sequestration), and vice versa for N-rich mature forests.

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Section: Microbial Biomass C and Water Soluble Organic C In Surface Smentioning

confidence: 72%

Section: Microbial Biomass C and Water Soluble Organic C In Surface Smentioning

confidence: 99%

Section: Microbial Biomass C and Water Soluble Organic C In Surface Smentioning

confidence: 99%

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13C abundance, water-soluble and microbial biomass carbon as potential indicators of soil organic carbon dynamics in subtropical forests at different successional stages and subject to different nitrogen loads

Fang

Cheng

et al. 2009

Plant Soil

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“…For Laelia speciosa this chlorophyll content did increase with the dose of nitrogen, suggesting that this plant was able to assimilate and utilize the supplied nitrogen for the production of photosynthetic pigments. However, but higher doses also resulted in a drastic When nitrogen is added, plants tend to increase their rates of carbon fixation (Brown et al, 1996;Bauer et al, 2004;Le Bauer and Treseder, 2008). However, as the concentrations of nitrogen increase, the carbohydrates that are necessary substrate for carboxylation become limiting and this results in an eventual reduction of CO 2 fixation (Brown et al, 1996;Bauer et al, 2004).…”

Section: Dose-response Experimentsmentioning

confidence: 99%

“…However, but higher doses also resulted in a drastic When nitrogen is added, plants tend to increase their rates of carbon fixation (Brown et al, 1996;Bauer et al, 2004;Le Bauer and Treseder, 2008). However, as the concentrations of nitrogen increase, the carbohydrates that are necessary substrate for carboxylation become limiting and this results in an eventual reduction of CO 2 fixation (Brown et al, 1996;Bauer et al, 2004). This also causes an increase and later reduction in carbon content for plants subjected to increasing doses of nitrogen, as was observed here for Laelia speciosa.…”

Section: Dose-response Experimentsmentioning

confidence: 99%

Effects of simulated nitrogen deposition and a stable isotopic assessment for the neotropical epiphytic orchid Laelia speciosa

Díaz-Álvarez

Lindig‐Cisneros

Reyes‐García

et al. 2014

Preprint

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The accelerated increase of nitrogen deposition is the third cause of biodiversity loss, as a result of saturation of ecosystems worldwide. The effects of nitrogen deposition on the endemic and endangered neotropical epiphytic orchid, Laelia speciosa, were evaluated via a dose-response experiment and a stable isotopic field assessment for individuals from a city and from an oak forest, in order to evaluate the potential risk facing this orchid, and record the history of the nitrogen deposition of series of consecutive annually produced pseudobulbs. Lower doses of nitrogen of up to 20 kg N ha yr -1 the dose that led to optimal performance of plants, acted as fertilizer. For instance, chlorophyll content and chlorophyll fluorescence (Fv/Fm) peaked at 0.66 ± 0.03 g m -2 and 0.85 ± 0.01, respectively. In contrast, toxic effects were observed at the higher doses of 40 and 80 kg N ha yr -1 , leading a decrease of 38% of the chlorophyll content and 23% of the chlorophyll fluorescence. For the field assessment, a tissue nitrogen content of 1.2 ± 0.1% (dry mass basis) for the orchids suggested non-toxic deposition rates both at the city and the oak forest. However, their respective isotopic signatures revealed different sources of N at each site.Indeed, in the oak forest δ 15 N amounted -3.1 ± 0.3‰, typical of places with low industrial activities, while in the city the δ 15 N reached 5.6 ± 0.2‰, typical of sites with some degree of industrial and automobile activity. Laelia speciosa would be an adequate bioindicator of nitrogen deposition because its ability to take up nitrogen from the atmosphere while preserving its isotopic signature and showing a clear physiological response to increasing inputs of nitrogen.However, its limited geographical distribution precludes the orchid as an ideal candidate for biomonitoring. Thus other vascular epiphytes should be considered for this purpose.

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Assessment of effects of the rising atmospheric nitrogen deposition on nitrogen uptake and long‐term water‐use efficiency of plants using nitrogen and carbon stable isotopes

Yao

Wang

Liu

et al. 2011

Rapid Comm Mass Spectrometry

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This study assesses the effects of the atmospheric nitrogen (N) deposition on the N uptake and the long-term water-use efficiency of two C(3) plants (Agropyron cristatum and Leymus chinensis) and two C(4) plants (Amaranthus retroflexus and Setaria viridis) using N and C stable isotopes. In addition, this study explores the potential correlation between leaf N isotope (δ(15)N) values and leaf C isotope (δ(13)C) values. This experiment shows that the atmospheric N deposition has significant effects on the N uptake, δ(15)N and leaf N content (N(m)) of C(3) plants. As the atmospheric N deposition rises, the proportion and the amount of N absorbed from the simulated atmospheric deposition become higher, and the δ(15)N and N(m) of the two C(3) plants both also increase, suggesting that the rising atmospheric N deposition is beneficial for C(3) plants. However, C(4) plants display different patterns in their N uptake and in their variations of δ(15)N and N(m) from those of C(3) plants. C(4) plants absorb less N from the atmospheric deposition, and the leaf N(m) does not change with the elevated atmospheric N deposition. Photosynthetic pathways may account for the differences between C(3) and C(4) plants. This study also shows that atmospheric N deposition does not play a role in determining the δ(13)C and in the long-term water-use efficiency of C(3) and C(4) plants, suggesting that the long-term water-use pattern of the plants does not change with the atmospheric N input. In addition, this study does not observe any relationship between leaf δ(15)N and leaf δ(13)C in both C(3) and C(4) plants.

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Effects of N addition rates on the productivity of Picea Sitchensis, Thuja plicata, and Tsuga heterophylla seedlings

Cited by 33 publications

References 0 publications

13C abundance, water-soluble and microbial biomass carbon as potential indicators of soil organic carbon dynamics in subtropical forests at different successional stages and subject to different nitrogen loads

13C abundance, water-soluble and microbial biomass carbon as potential indicators of soil organic carbon dynamics in subtropical forests at different successional stages and subject to different nitrogen loads

Effects of simulated nitrogen deposition and a stable isotopic assessment for the neotropical epiphytic orchid Laelia speciosa

Assessment of effects of the rising atmospheric nitrogen deposition on nitrogen uptake and long‐term water‐use efficiency of plants using nitrogen and carbon stable isotopes

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