Effects of fire alone or combined with thinning on tissue nutrient concentrations and nutrient resorption in <Emphasis Type="Italic">Desmodium nudiflorum</Emphasis> |
| |
Authors: | Jianjun Huang Ralph E J Boerner |
| |
Institution: | (1) Department of Evolution, Ecology, and Organismal Biology, Ohio State University, 318 West 12th Avenue, Columbus, OH 43210, USA |
| |
Abstract: | This study examined tissue nutrient responses of Desmodium nudiflorum to changes in soil total inorganic nitrogen (TIN) and available phosphorus (P) that occurred as the result of the application
of alternative forest management strategies, namely (1) prescribed low-intensity fire (B), (2) overstory thinning followed
by prescribed fire (T + B), and (3) untreated control C), in two Quercus-dominated forests in the State of Ohio, USA. In the fourth growing season after a first fire, TIN was significantly greater
in the control plots (9.8 mg/kg) than in the B (5.5 mg/kg) and T + B (6.4 mg/kg) plots. Similarly, available P was greater
in the control sites (101 μg/g) than in the B (45 μg/kg) and T + B (65 μg/kg) sites. Leaf phosphorus (P]) was higher in the
plants from control site (1.86 mg/g) than in either the B (1.77 mg/g) or T + B plants (1.73 mg/g). Leaf nitrogen (N]) and
root N] showed significant site–treatment interactive effects, while stem N], stem P], and root P] did not differ significantly
among treatments. During the first growing season after a second fire, leaf N], stem N], litter P] and available soil P]
were consistently lower in plots of the manipulated treatments than in the unmanaged control plot, whereas the B and T + B
plots did not differ significantly from each other. N resorption efficiency was positively correlated with the initial foliar
N] in the manipulated (B and T + B) sites, but there was no such relation in the unmanaged control plots. P resorption efficiency
was positively correlated with the initial leaf P] in both the control and manipulated plots. Leaf nutrient status was strongly
influenced by soil nutrient availability shortly after fire, but became more influenced by topographic position in the fourth
year after fire. Nutrient resorption efficiency was independent of soil nutrient availability. These findings enrich our understanding
of the effects of ecosystem restoration treatments on soil nutrient availability, plant nutrient relations, and plant–soil
interactions at different temporal scales. |
| |
Keywords: | Fire Herb Nitrogen Nutrient resorption Phosphorus Thinning |
本文献已被 PubMed SpringerLink 等数据库收录! |
|