Effects of slash and litter management and fertilizer practiceson growth and soil chemical properties of eucalyptus hybrid (E. urophylla × E. pellita) 5 years old in Yen Bai province
Keywords:
Plantation site management, multi-rotation plantation managemen, degraded plantation forest land, Eucalyptus urophylla × E. pellitaAbstract
Decline of yield and soil fertility of eucalypt plantations are associated
with unsustainable site management practices. This study testedthe
simultaneous effects of fertilizers and slash management on growth and
soil properties of 5 - year-old Eucalyptus hybrid (E. urophylla E. pellita)
planted on degraded land after several rotations of eucaltypt plantations in
Yen Bai provinces. The growth data collected annually from ages1 to 5
showed that application of fertilizers based on specific demandof the trees
have a significant effect on growth rate. Fertilizer mixed fromsingle
elements including micronized organic fertilizers, urea, super phosphate
and potassium fertilizers have the best growth rate compared tothe NPK fertilizers commonly used in practice. Applying microorganism-inoculated
products has better effect on phosphorus mineralisation and cellulose
decomposition into available minerals for plant uptake, but with poorer
growth rate due to lack of fertilizer application. The growth rate was not
significant different between the slash and litter burning and non-burning
treatments for land preparation. Soil organic carbon and some soil
chemical properties such as pH, nitrogen and phosphorus have significantly
changed after tree planting. Total soil organic carbon and nitrogen
increased slightly after tree planting due to decomposition of organic
matters from slash and litter, but in the second and third years, they
decreased significantly. Extractable phosphorus continuously reduced since
tree planting, which is associated with soil phosphorus immobilisation.
There is not significant different in the soil properties between the burned
and non-burned treatments and between fertilizer treatments up to 5 years
of ages.
References
1. Bich, N. V., Eyles, A., Mendham, D., Dong, T. L., Ratkowsky, D., Evans, K. J., Hai, V. D., Thanh, H. V., Thinh, N. V. & Mohammed, C., 2018. Decomposition Rates and Nutrient Release from Acacia mangiumHarvest Residues in Northern Vietnam. in press.
2. Deleporte, P., Laclau, J. P., Nzila, J. D., Kazotti, J. G., Marien, J. N., Bouillet, J. P., Szwarc, M., D’annunzio, R. & Ranger, J., 2008. Effects of slash and litter management practices on soil chemical properties and growth of second rotation eucalypts in the Congo. In: NAMBIAR, E. K. S., ed. Site management and productivity in
tropical plantation forests, 2008 Piracicaba, Brazil and Bogor,Indonesia. Bogor: CIFOR, 5 - 22.
3. Dong, T. L., 2014. Impact of short-rotation Acacia hybrid plantations on soil properties of degraded lands in Central Vietnam. Soil Research 52(3): 271 - 281.
4. Huong, V. D., Nambiar, E. K. S., Quang, L. T., Mendham, D. S. &Dung, P. T. 2015. Improving productivity and sustainability of successive rotations of Acacia auriculiformis plantations in South Vietnam. Southern Forests: a Journalof Forest Science,77,51 - 58.
5. Li, Z., Peng, S. L., Rae, D. & Zhou, G.Y., 2001. Litter decomposition and nitrogen mineralisation of soils in subtropical plantation forests of Southern China, with special attention to comparisons between legumes and non-legumes. Plant and Soil,229,105 - 116.
6. Mendham D.S., Grove T.S., O’Connell A.M. and Rance S.J., 2008. Impacts of inter-rotation site management on soil nutrients and plantation productivity in Eucalyptus globulusplantations in South-Western Australia. In: Nambiar E. K. S. (ed), Site management and productivity in tropical plantation forests. CIFOR, Piracicaba,
Brazil and Bogor, Indonesia, pp. 79 - 92.
7. Paul K.I., Polglase P.J., Nyakuengama J.G. and Khanna P.K., 2002. Change in soil carbon following afforestation. Forest Ecology and Management 168: 241 - 257.
8. Phạm Quang Thu, 2009. Nghiên cứu sản xuất chế phẩm vi sinh hỗn hợp MF1 dạng viên nén cho cây thông, cây bạch đàn ở vườn ươm và rừng trồng. Kỷ yếu hội nghị Khoa học Công nghệ Lâm nghiệp khu vực phía Bắc, tháng 10/2009, trang 517 - 525.
9. Phạm Thế Dũng, Kiều Tuấn Đạt, Lê Thanh Quang, Phạm Văn Bốn, Vũ Đình Hưởng, 2012. Nghiên cứu các biện pháp kỹ thuật bảo vệ và nâng cao độ phì của đất nhằm nâng cao năng suất rừng trồng bạch đàn, keo ở các luân kỳ sau, Viện Khoa học Lâm nghiệp Việt Nam, Hà Nội, p. 138
10. Võ Đại Hải, Nguyễn Xuân Quát, Trần Văn Con, Đặng Thịnh Triều, 2006. Trồng rừng sản xuất vùng miền núi phía Bắc - Từ nghiên cứu đến phát triển, Nhà xuất bản Nông nghiệp, Hà Nội.
11. Võ Đại Hải, 2019. Nghiên cứu các biện pháp kỹ thuật tổng hợp đểphát triển trồng rừng cung cấp gỗ lớn các loài Keo tai tượng, Keo lá tràm và bạch đàn trên lập địa sau khai thác ít nhất hai chu kỳ tại một số vùng trồng rừng tập trung, Viện Khoa học Lâm nghiệp Việt Nam, Hà Nội.
12. Schiavo J.A., Busato J.G., Martins M.A. and Canellas L.P., 2009. Recovery of degraded areas revegetated with Acacia mangiumand Eucalyptus with special reference to organic matter humification. Scientia Agrícola 66: 353 - 360.
13. Tiarks, A. & Ranger, J., 2008. Soil properties in tropical plantation forests: evaluation and effects of site management: a summary. In: NAMBIAR, E. K. S., ed. Site management and productivity in tropical plantation forests, 2008 Piracicaba, Brazil and Bogor, Indonesia. Bogor: CIFOR, 191 - 204.
14. Tổng cục Lâm nghiệp, 2015. Dự án quy hoạch chuyển đổi loài cây trồng rừng phục vụ đề án tái cơ cấu ngành lâm nghiệp. Báo cáo tổng kết dự á
