Nutrient Dynamics of Fine Roots in the Mixed Plantation of Poplar and Black Locust |
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Authors: | Mingpu Zhai Sannai Jiang Liming Jia |
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Institution: | (1) College of Resources and Environment, Beijing Forestry University, Beijing, 100083, China |
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Abstract: | The mixed plantation of poplar (Populus spp.) and black locust (Robinia pseudoacacia) is one of the typical mixed stands with nitrogen-fixing and non-nitrogen-fixing species. Interaction between the two species
in the mixed stand is harmonious and productivity is high, making this kind of mixed plantation a very successful pattern
on poor sandy sites in north China. In this study, the fine root decomposition of the two species was investigated in the
mixed plantation of 27-year-old Canadian poplar (P. canadansis) and 22-year-old black locust on sandy sites along the Chaobai River in Beijing. Mechanism of harmonious interaction between
the two species was observed in the view of the nutrient cycle of fine roots. Results showed that: (1) the fine root decomposition
of Canadian poplar and black locust trees was different. Concentrations of N, Ca and Mg gradually increased and those of P
and K gradually decreased in the fine roots of poplar during the period of decomposition. Concentrations of N, P and K gradually
decreased in the fine roots of black locust during decomposition. The speed of nutrient decomposition in mixed fine roots
of the two species fell between the speed of the two pure samples. (2) During decomposition, the annual return amount of N,
K and Mg in fine roots of black locust was highest, followed by the mixed fine roots of the two species, and then the fine
roots of poplar. (3) The increased return amount of N in mixed fine roots could improve the N nutrient condition of poplar
trees. The return amount of P in poplar fine roots was greater than that of black locust, which could improve the P nutrient
of black locust trees. The interaction of mutual supplements of N and P nutrient cycle of fine roots between these two species
formed.
Translated from Scientia Silvae Sinicae, 2004, 4(4) (in Chinese) |
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Keywords: | fine root nutrient poplar black locust mixed plantation |
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