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Acer truncatum seedlings are more plastic than Quercus variabilis seedlings in response to different light regimes

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Guo X., Wang R.-Q., Wang C. D., Xu F., Zhao S., Guo W.-H.

Dendrobiology

2016

tom 76

In this study, we investigated responses of the mid-successional species Acer truncatum Bunge and the late-successional species Quercus variabilis Blume to three solar illumination conditions: (1) constant low light (CL), (2) constant high light (CH) and (3) low light first and high light afterwards (LH). The last treatment was to simulate a canopy opening. Both species exhibited increases in biomass, totally and in part, and decreases in leaf water content, specific leaf area and chlorophyll concentrations in LH treatment compared to CL treatment. For A. truncatum, exposure to high light condition (LH) increased crown area, and decreased root to shoot ratio, stem mass ratio and leaf perimeter. However, for Q. variabilis, LH treatment increased stem diameter at ground height, effective quantum yield, photochemical quenching and decreased maximum photosystem II quantum yield. The biomass allocation pattern did not change in Q. variabilis among three light conditions. With respect to newly developed leaves, no significant differences were found in leaf size of Q. variabilis between LH treatment and CH treatment while that of A. truncatum decreased in LH treatment. All chlorophyll fluorescence parameters in newly developed oak leaves in LH treatment increased compared to those of CH treatment while no difference was found for A. truncatum between LH and CH treatment. A. truncatum displayed a greater overall plasticity than Q. variabilis although the oak seedlings have a greater plasticity with respect to chlorophyll concentration and chlorophyll ﬂuorescence parameters. A. truncatum should be a better candidate for vegetation recovery, especially in places with heterogeneous light conditions.

Effects of nitrogen addition on growth and photosynthetic characteristics of Acer truncatum seedlings

100%

Guo X., Wang R., Chang R., Liang X., Wang C., Luo Y., Yuan Y., Guo W.

Dendrobiology

2014

tom 72

Increasing levels of atmospheric nitrogen deposition have greatly affected forest trees. Acer truncatum Bunge has a large distribution in northern China, Korea and Japan and plays an important ecological role in forest ecosystems. We investigated the responses of A. truncatum to a broad range of nitrogen addition regimes with a focus on seedling growth, biomass partitioning, leaf morphology, gas exchange physiology and chlorophyll fluorescence physiology. Moderate nitrogen addition promoted shoot height, stem diameter at ground height, total biomass, size of leaves and chlorophyll fluorescence and gas exchange performance, whereas extreme level of nitrogen addition did not result in such facilitation. Chlorophyll content, pattern of biomass partitioning, ratio of leaf length to width, leaf water content, and specific leaf area did not change among the addition regimes. The critical amount of nitrogen deposition should be defined in the context of a certain time period in a particular region for a certain species at a special developmental stage. The critical amount of N deposition that weakens total biomass facilitation in A. truncatum planted in mixed soil of yellow cinnamon soil and humic soil is approximately 10 g N m−2 y−1 during the first growing season.

Ograniczanie wyników

2 Dendrobiology

2 Guo X.

1 Chang R.

1 Guo W.

1 Guo W.-H.

1 Liang X.

1 Luo Y.

1 Wang C.

1 Wang C. D.

1 Wang R.

1 Wang R.-Q.

1 Xu F.

1 Yuan Y.

1 Zhao S.

1 2016

1 2014

Wyniki wyszukiwania

Acer truncatum seedlings are more plastic than Quercus variabilis seedlings in response to different light regimes

Effects of nitrogen addition on growth and photosynthetic characteristics of Acer truncatum seedlings