Impact factors on fine root seasonal dynamics in Fraxinus mandshurica plantations |
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Authors: | Li Mei Youzhi Han Shuiqiang Yu Jianwei Shi Zhengquan Wang |
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Institution: | (1) Forestry College, Northeast Forestry University, Harbin, 150040, China;(2) Forestry College, Shanxi Agricultural University, Taigu, 030801, China |
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Abstract: | Fine root turnover plays important roles in carbon allocation and nutrient cycling in forest ecosystems. Seasonal dynamics
of fine roots is critical for understanding the processes of fine root turnover. From May to October 2002, soil core method
was used for estimating the seasonal pattern of fine root (diameter < 1 mm) parameters (biomass, specific root length (SRL)
and root length density (RLD)) in a Manchurian ash (Fraxinus mandshurica) plantation located at the Maoershan Experiment Station, Heilongjiang Province, northeast of China. The relationships of
fine root biomass, SRL and RLD with available nitrogen in soil, average soil temperature per month in 10 cm depth and soil
moisture content were analyzed. Seasonal variation of fine root biomass was significant (P < 0.05). The peak values of fine root biomass were observed both in spring and in autumn, but SRL and RLD were the highest
in spring and lowest in autumn. Specific root length and root length density were higher in spring and summer, which means
that fine root diameter was thinner. In autumn, both parameters decreased significantly due to secondary incrassation of fine
root diameter or the increase of tissue density. Seasonal dynamics of fine roots was associated with available nitrogen in
soil, soil temperature in 10 cm depth and moisture content. Fine root biomass has a significant relationship with available
NH4
+-N in soil. Available NO3
−-N in soil, soil temperature in 10-cm depth and moisture content have a positive correlation with fine root biomass, SRL and
RLD, although these correlations are not significant (P > 0.05). But the compound effects of soil available N, soil temperature and soil moisture content are significant to every
root parameter. The variations of these three root parameters in different seasons show different physiological and ecological
functions in different growing periods.
Translated from Scientia Silvae Sinicae, 2006, 42(9): 7–12 译自: 林业科学] |
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Keywords: | Fraxinus mandshurica fine root biomass root length density (RLD) specific root length (SRL) seasonal dynamics |
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