| Nutrient Management for Eucalypt Plantations in South China |
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| 作者姓名： | KU Daping Bernie DELL. Research Institute of Tropical Forestry CAF Guangzhou China . Murdoch University. Perth. Australia |
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| 摘 要： | Eucalypts are very popular for revegetation in many parts of south China because of their capacity to tolerate degraded sites and unfertile soils,and their fast growth potential to coppice. This paper reviews a decade of field trials in china, undertaken as part of several bilateral researchprograms in plantation forestry, concerning the use of fertilizers, harvest residue management and inoculation with ectomycorrhizal fungi. One of the key questions addressed is whether the productivity of plantation eucalypts in south China can be increased to the world average by nutrient management across a rotation.
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Nutrient Management for Eucalypt Plantations in South China |
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| KU Daping Bernie DELL. Research Institute of Tropical Forestry,CAF,Guangzhou ,China . Murdoch University. Perth. Australia.Nutrient Management for Eucalypt Plantations in South China[J].中国林业科技(英文版),2002(1). |
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| Authors: | KU Daping Bernie DELL Research Institute of Tropical Forestry CAF Guangzhou China Murdoch University Perth Australia |
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| Institution: | dell@central.murdoch.edu.au |
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| Abstract: | Eucalypts are very popularfor revegetation in many parts of south China because of their capacity to tolerate degraded sites and unfertile soils, and their fast growth potential to coppice. This paper reviews a decade of field trials in china, undertaken as part of several bilateral research programs inplantationforestry, conceming the use offertilizers, harvest residue management and inoculation with ectomycorrhizal fungi. One of the key questions addressed is whether the productivity of plantation eucalypts in south China can be increased to the world average by nutrient management across a rotation.Some of the key flndings are: Application of superphosphate at establishment substantially increased growth, tree survival and nutrient uptake. The P recovery by tree uptake was between 6%-35% and decreased as the quantity of P apply increased. Phosphorus applied in the first rotation resulted in elevated levels of available, total and organic P in the topsoil in the second rotation. Coppice response to P was lower than the response to P in the first rotation, indicating the potential importance of P storage in roots. Inoculation with ectomycorrhizal fungi affected stand volume but the effect was isolate-dependent. Performance of isolates in the greenhouse was not a good indicator of field performance. Large numbers of fungi need to be screened in the field in order to identify superior isolates.Reduction in the amount of residue removed during harvest to increase tree growth by increasing available nutrient supply and reducing the loss of soil organic C after tree planting. Intercropping with N-fixing trees enhanced tree growth and increased litterfall. More than 80% of nutrient accumulation by trees is lost via harvesting practices.The productivity of plantation eucalypts can be improved to 10-20 m3 ha-1 yr.-1, the average productivity in the world, by nutrient management. Recommended site management (land preparation, weed control, fertilizer rates) options are discussed. Harvest residue retention and coppice regeneration are recommended as operational practices in the second rotation.This research indicates that the productivity of well-managed plantations can be sustained whereas poor management practices result in dramatic yield declines across rotations and continued soil degradation. Increasing the productivity of eucalypt plantations in south China will enable land resources supporting some secondary forests to be usedfor ecological conservation in place of plantations. |
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| Keywords: | afforestation sustainable forestry nutrient management mycorrhizal fungi |
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