Water and nitrogen dynamics in rotational woodlots of five tree species in western Tanzania

Nyadzi, G.I.; Janssen, B.H.; Otsyina, R.; Booltink, H.W.G.; Ong, C. K.; Oenema, O.

doi:10.1023/b:agfo.0000005223.27670.7f

Cited by 15 publications

(13 citation statements)

References 14 publications

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“…A previous study of this system reported limited ability of tree fallows to improve soil fertility due to an inherently short fallow period of 4 years (Nyadzi et al 2003b). In contrast, our results involving 5-year fallows, revealed that inorganic N and extractable P status in soils increased after this period to achieve adequacy for one cropping season of maize (Fig.…”

Section: Nutrient Restitutionmentioning

confidence: 92%

Nutrient use efficiency and biomass production of tree species for rotational woodlot systems in semi-arid Morogoro, Tanzania

et al. 2007

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Frequent nutrient removals accompanying wood and crop harvests from rotational woodlot systems may contribute to declining site productivity and sustainability because of soil nutrient depletion. However, selecting for nutrient-efficient tree species may well sustain productivity under this system. To test this hypothesis, a randomized complete block experiment was adopted to assess effects of five tree species on soil nutrients status, nutrient use efficiency and wood yield in semi-arid Tanzania. After 5 years rotation, top soils under Gliricidia sepium (Jaqua), Acacia polyacantha Willd. and Acacia mangium Willd. were the most fertile with soil organic carbon and exchangeable cation status raised close to those in natural Miombo systems. Soil inorganic N and extractable P levels reached sufficiency levels for subsequent maize culture. Wood productivity in tree fallows averaged three times higher than that of Miombo woodlands indicating the high potential of the woodlot system to supply fuelwood, and consequently relieve harvesting pressures on the natural forests. Acacia crassicarpa A. Cunn. ex Benth. produced the most wood (51 Mg ha À1 ) at low nutrient ''costs'' presumably due to high nutrient use efficiency. Wood yield of this species was 42 and 120% greater than that of A. polyacantha and A. nilotica, respectively, but contained comparatively less nutrients (42-60% less for P, K, and Ca). Gliricidia sepium and A. polyacantha returned the largest amount of nutrients through slash at harvests. Of all test species, A. crassicarpa exhibited the most promise to sustain wood production under rotational woodlot systems due to relatively high productivity and low nutrient export at harvest.

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Section: Nutrient Restitutionmentioning

confidence: 92%

Nutrient use efficiency and biomass production of tree species for rotational woodlot systems in semi-arid Morogoro, Tanzania

et al. 2007

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Section: Introductionmentioning

confidence: 99%

“…A secondary one is where they have been actively promoted by outside agencies to rural communities for some developmental or utilitarian purpose, such as agroforestry (e.g. Nyadzi et al, 2003), fuel and timber woodlots (Midgley et al, 1996;Kabir & Webb, 2005), or food security (Rinaudo & Cunningham, 2008), often accompanied by transfers of knowledge in, for example, silviculture or charcoal production.…”

Section: Introductionmentioning

confidence: 99%

Adoption, use and perception of Australian acacias around the world

Kull

Shackleton

Cunningham³

et al. 2011

Diversity and Distributions

191

208

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Aim To examine the different uses and perceptions of introduced Australian acacias (wattles; Acacia subgenus Phyllodineae) by rural households and communities. Location Eighteen landscape‐scale case studies around the world, in Vietnam, India, Réunion, Madagascar, South Africa, Congo, Niger, Ethiopia, Israel, France, Portugal, Brazil, Chile, Dominican Republic and Hawai‘i. Methods Qualitative comparison of case studies, based on questionnaire sent to network of acacia researchers. Information based on individual knowledge of local experts, published and unpublished sources. Results We propose a conceptual model to explain current uses and perceptions of introduced acacias. It highlights historically and geographically contingent processes, including economic development, environmental discourses, political context, and local or regional needs. Four main groupings of case studies were united by similar patterns: (1) poor communities benefiting from targeted agroforestry projects; (2) places where residents, generally poor, take advantage of a valuable resource already present in their landscape via plantation and/or invasion; (3) regions of small and mid‐scale tree farmers participating in the forestry industry; and (4) a number of high‐income communities dealing with the legacies of former or niche use of introduced acacia in a context of increased concern over biodiversity and ecosystem services. Main conclusions Economic conditions play a key role shaping acacia use. Poorer communities rely strongly on acacias (often in, or escaped from, formal plantations) for household needs and, sometimes, for income. Middle‐income regions more typically host private farm investments in acacia woodlots for commercialization. Efforts at control of invasive acacias must take care to not adversely impact poor dependent communities.

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“…Therefore, measurement of net N mineralization in soil is imperative if a closer match between existing N and the plant requirements is to be achieved with consequent reduction in N losses (Makumba et al 2007). However, a quantitative understanding of N and other nutrients' cycling processes is essential to exploit the potential benefits and identify possible constraints associated with promising agroforestry systems (Nyadzi et al 2003). Present traditional agroforestry systems are based on cultivation of a variety of crops and trees that has allowed farmers to maximize harvest security.…”

Section: Introductionmentioning

confidence: 99%

Mineralization Dynamics of Nitrogen and Phosphorus inAreca CatechuL.–Based Traditional Agroforestry System

Tanjang

Shukla

Arunachalam

2009

Communications in Soil Science and Plant Analysis

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Areca catechu L.-based agroforestry system is practiced by local farmers in which a variety of crops are cultivated along with trees to maximize harvest security. Most farmers do not use inorganic fertilizers to improve crop yields, mainly because they cannot afford to purchase these fertilizers, and for this reason cycling of nutrients through the decomposition of plant residues becomes an important phenomenon in this type of agroforestry system. In this context, a study was carried out to estimate in situ nitrogen (N) and phosphorus (P) mineralization as influenced by soil type and management system. Net N and P mineralization rates were studied on the basis of final concentrations of ammonia, nitrate, and P in soil using a buried-bag technique for one cropping cycle to examine temporal and depth variations across the three different sites (Harmutty, Nirjuli, and Doimukh). A significant variation in N mineralization was recorded among the three sites. Seasonal changes in N and P mineralization were also observed. The Harmutty site had highest rates of N mineralization during the rainy season and immobilization during spring. Phosphorus mineralization rate was higher during autumn at Doimukh and during winter in Harmutty and Nirjuli sites, whereas greater immobilization was recorded during the rainy season. The Harmutty site recorded a greater ammonification rate

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Water and nitrogen dynamics in rotational woodlots of five tree species in western Tanzania

Cited by 15 publications

References 14 publications

Nutrient use efficiency and biomass production of tree species for rotational woodlot systems in semi-arid Morogoro, Tanzania

Nutrient use efficiency and biomass production of tree species for rotational woodlot systems in semi-arid Morogoro, Tanzania

Adoption, use and perception of Australian acacias around the world

Mineralization Dynamics of Nitrogen and Phosphorus inAreca CatechuL.–Based Traditional Agroforestry System

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