Influence of tree roots on nitrogen mineralization

被引:32
作者
Colin-Belgrand, M [1 ]
Dambrine, E [1 ]
Bienaimé, S [1 ]
Nys, C [1 ]
Turpault, MP [1 ]
机构
[1] INRA Nancy, Unite Biogeochim Ecosyst Forestiers, FR-54280 Seichamps, France
关键词
bulk soil; forest; nitrification; nitrogen mineralization; rhizospheric soil;
D O I
10.1080/02827580308625
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
This study compared the total carbon (C), mineral nitrogen (N) contents and N mineralization potentials of the rhizospheric and bulk soils, collected at two depths in three forest sites in France. The site at Breuil is a comparative plantation of different species with or without fertilization, the Fougeres site is a time sequence of four Fagus sylvatica L. stands including a limed plot, and the Aubure site is a comparison between adjacent young and old Picea abies. ( L.) Karst stands with different nitrifying activity. Mineral N was extracted from fresh soil with K2SO4 and after laboratory incubation at 15 degreesC for 2 days or 1 week. The moisture, C and N contents of the rhizospheric soil were higher than in the bulk soil in the A(1) horizon, but only slightly higher or similar in A(1)B horizons. Soil-extractable NH4 and net mineralization were much larger in the rhizospheric soil than in the bulk soil. Soil-extractable NO3 and net nitrification were not significantly different. Soil-extractable NH4 and net N mineralization were linearly and positively related to the soil C ( or N) contents, but the relationship was stronger and the amount of mineral N per gram of carbon was higher for rhizospheric soil. This suggests that the quality of rhizospheric carbon should be taken into account. Net N mineralization was negatively related to the soil C/N ratio. In summary, tree roots appear to have a strong influence on N transformation in soils.
引用
收藏
页码:260 / 268
页数:9
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