000			02063nam a2200229Ia 4500
008			220216s9999 xx 000 0 und d
100			_asang MinhPhan
245		0	_aCarbon sequestration and soil fertility of tropical tree plantations and secondary forest established on degraded land
260			_bPlant and Soil _c2013
300			_a187-200
520			_aPurpose:Much tropical land requires rehabilitation but the capacity of reforestation with plantations or naturally regenerating secondary forests for overcoming soil degradation remains unclear. We hypothesised that desirable effects, including improved soil fertility and carbon sequestration, are achieved to a agreater extent in Acacia mangium plantations and secondary forests than in Eucalyptus urophylla plantations. Methods: We tested our hypothesis soil and climate gradients in Vietnam with linear mixed-effect models and other, comparing A. mangium and E. urophylla plantations, secondary forests showed a positive correlation between biomass production and desirable soils properties including increased soil carbon, nitrogen and phosphurus, and reduced bulk density. All plantations, but not secondary forests, caused increases in soil acidity. Eight-year old A. mangium plantations contained most carbon in biomass+soil, and secondary forests and pastures had similar a higher soil carbon. E. urophylla plantations had the lowest soil carbon status, raising doubt about their sequestration capacity in current 6-8 uear rotations. Conclusion: The study demonstrate that appropriate reforestation enhances soil fertility and promotes carbon sequestration on degraded tropical lands and that unmanaged secondary forests are effective at improving soil fertility and sequestering carbon at low cost.
650			_aAboveground biomass
650			_aAcacia mangium
650			_aEucalyptus urophylla
650			_aLand rehabilitation
650			_aLand use
650			_aSoil restoration
700			_aBonner Mark
700			_aLamb David
700			_aSchmidt Susanne
942			_cJS
999			_c55161 _d55161