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Chinese Journal of Plant Ecology >
CARBON AND NITROGEN ACQUISITION AND ALLOCATION IN LARCH SEEDLINGS IN RESPONSE TO DIFFERENT N SUPPLY RATES
Received date: 2004-03-31
Accepted date: 2004-11-18
Online published: 2005-07-31
Supported by
National Natural Science Foundation of China(30130160)
Larch (Larix gmelinii) is the most important industrial timber species in northeastern China, and is ecological significant in boreal forest ecosystems. However, the growth of larch is often limited by nitrogen (N) availability because of slow litter decomposition rates due to low temperatures and the long winter in these northern forests. To explore the relationship between growth and soil N availability in larch, we treated one-year old larch seedlings to four different N supply levels (1, 4, 8 and 16 mmol·L-1, respectively) and measured acquisition and allocation of carbon and N. The results showed that the biomass, whole plant N concentration, whole plant N content and special N absorption rate of larch seedlings were enhanced with N supply levels. With the increase in N supply, needle and stem weight ratios and needle and stem N weight ratios increased, whereas the root weight ratio and root N weight ratio decreased. As N supply levels increased from 1 mmol·L-1 to 8 mmol·L-1, whole plant relative growth rate (RGR) increased linearly, whereas whole plant N productivity (NPP) remained constant. At the highest N treatment (16 mmol·L-1), whole plant RGR was the same as in the 8 mmol·L-1 N treatment, but NPP decreased significantly compared with the 8 mmol·L-1 treatment. In contrast, needle N productivity of larch seedlings exhibited a negative relationship with N supply level.
Key words： Larch; N supply level; Acquisition; Allocation; Nitrogen productivity
GUO Sheng-Lei, YAN Xiu-Feng, BAI Bing, YU Shuang . CARBON AND NITROGEN ACQUISITION AND ALLOCATION IN LARCH SEEDLINGS IN RESPONSE TO DIFFERENT N SUPPLY RATES[J]. Chinese Journal of Plant Ecology, 2005 , 29(4) : 550 -558 . DOI: 10.17521/cjpe.2005.0074
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