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Sammanfattning

The Masha natural bamboo forest was stocked with 8840 trees ha(-1), unifomily distributed with a mean height of 16.8 m. diameter of 7.6 cm and leaf area index (LAI) of 9.7. Age-structure was 13% of < 1 year. 24% of 1-3 years and 63%, of >3 years. Culm contributed 82%, branch 13% and leaf 5% to the 110 t ha(-1) total above ground biomass, while trees mature for harvest (>3 year) made up 73%. The culm component of the mature trees was 60% of the above ground biomass. whereas the biomass of current shoots (<1 year) constituted only 7%. Annual shoot production was 8 t ha(-1) and contained 44, kg ha(-1) of N. 6 kg ha(-1) of P, 122 ka ha(-1) of K and 1 ka ha(-1) of Ca. Significant variations in nutrient concentration of plant tissues were found among age-classes and between seasons. More than 8 t ha(-1) year(-1) plant litter containing 115 kg N, 8 kg P. 56 kg K and 22 kg Ca returned to the soil surface mainly during the humid season. Resorption efficiency of the foliage was 43% for K, 37%, for P and 19% for N. Soil nutrient concentrations declined sharply with soil depth and a large fraction of the total soil nutrient pool was located in the organic layer; the soil was poor in P and K. Management approaches to improve the production efficiency of the forest and the quality of the harvested biomass are discussed. (C) 2004 Elsevier B.V. All rights reserved.

Nyckelord

age structure; bamboo; biomass; Ethiopia; growth; LAI; nutrients; Yushania alpina

Publicerad i

Forest Ecology and Management
2005, volym: 204, nummer: 45691, sidor: 159-169
Utgivare: ELSEVIER SCIENCE BV

SLU författare

UKÄ forskningsämne

Jordbruksvetenskap
Bioenergi

Publikationens identifierare

  • DOI: https://doi.org/10.1016/j.foreco.2004.07.074

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/5154