scholarly journals Drought alters the carbon footprint of trees in soils—tracking the spatio‐temporal fate of 13 C‐labelled assimilates in the soil of an old‐growth pine forest

2021 ◽  
Author(s):  
Decai Gao ◽  
Jobin Joseph ◽  
Roland A Werner ◽  
Ivano Brunner ◽  
Alois Zürcher ◽  
...  
Keyword(s):  
Carbon Footprint ◽  
Pine Forest ◽  
Old Growth ◽  
Spatio Temporal

scholarly journals Nitrogen input <sup>15</sup>N-signatures are reflected in plant <sup>15</sup>N natural abundances of sub-tropical forests in China

2016 ◽  
Author(s):  
Geshere Abdisa Gurmesa ◽  
Xiankai Lu ◽  
Per Gundersen ◽  
Yunting Fang ◽  
Qinggong Mao ◽  
...  
Keyword(s):  
Tropical Forests ◽  
Southern China ◽  
Nitrogen Addition ◽  
N Deposition ◽  
Pine Forest ◽  
N Cycling ◽  
N Addition ◽  
Higher Plant ◽  
Old Growth ◽  
Old Growth Forest

Abstract. Natural abundance of 15N (δ15N) in plants and soils can provide integrated information on ecosystem nitrogen (N) cycling, but it has not been well tested in warm and humid sub-tropical forests. In this study, we examined the measurement of δ15N for its ability to assess changes in N cycling due to increased N deposition in an old-growth broadleaved forest and a secondary pine forest in a high N deposition area in southern China. We measured δ15N of inorganic N in input and output fluxes under ambient N deposition, and N concentration (N %) and δ15N of major ecosystem compartments under ambient and after decadal N addition at 50 kg N ha−1 yr−1. Our results showed that the N deposition was δ15N-depleted (−12 ‰) mainly due to high input of depleted NH4&amp;plus;-N. Plant leafs in both forest were also δ15N-depleted (−4 to −6 ‰). The old-growth forest had higher plant and soil N %, and was more 15N-enriched in most ecosystem compartments relative to the pine forest. Nitrogen addition did not significantly affect N % in both forests, indicating that the ecosystem pools are already N-rich. Soil δ15N was not changed significantly by the N addition in both forests. However, the N addition significantly increased the δ15N of plants toward the 15N signature of the added N (~ 0 ‰), indicating incorporation of added N into plants. Thus, plant δ15N was sensitive to ecosystem N input manipulation although N % was unchanged in these N-rich sub-tropical forests. We interpret the depleted δ15N values of plants as an imprint from the high and δ15N-depleted N deposition. The signal from the input (deposition or N addition) may override the enrichment effects of fractionation during the steps of N cycling that are observed in most warm and humid forests. Thus, interpretation of ecosystem δ15N values from high N deposition regions need to include data on the deposition δ15N signal.

scholarly journals Spatiotemporal structure of the electromagnetic field in a forest environment at nanosecond location

2021 ◽  
Vol 2140 (1) ◽  
pp. 012019
Author(s):  
B Ch Dorzhiev ◽  
O N Ochirov
Keyword(s):  
Electromagnetic Field ◽  
Total Energy ◽  
Temporal Distribution ◽  
Pine Forest ◽  
Forest Environment ◽  
Spatiotemporal Structure ◽  
Reflected Signal ◽  
Spatio Temporal

Abstract The results of measurements of the spatio-temporal distribution of direct and reflected signal levels inside a pine forest are presented. Circular diagrams are built on the basis of which it is possible to assess the levels of direct and reflected signals at a bistatic nanosecond location. The obtained diagrams a give spatial picture of the total energy of the electromagnetic field in the forest environment.

Toward reference conditions: wildfire effects on flora in an old-growth ponderosa pine forest

2004 ◽  
Vol 199 (1) ◽  
pp. 137-152 ◽  
Author(s):  
Daniel C. Laughlin ◽  
Jonathan D. Bakker ◽  
Michael T. Stoddard ◽  
Mark L. Daniels ◽  
Judith D. Springer ◽  
...  
Keyword(s):  
Ponderosa Pine ◽  
Reference Conditions ◽  
Pine Forest ◽  
Old Growth ◽  
Wildfire Effects ◽  
Ponderosa Pine Forest
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