Mineral Cycling: Some Basic Concepts and Their Application in a Tropical Rain Forest

Jordan, Carl F.; Kline, J.R.

doi:10.1146/annurev.es.03.110172.000341

Cited by 39 publications

(19 citation statements)

References 36 publications

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“…Higher calcium concentrations in year 2 are unlikely to be explained by changes in the rate of decomposition of litter. Calcium is less mobile than sodium or potassium (Attiwill 1968;Eaton, Likens & Bormann 1973;Jordan & Kline 1972;Wood 1974) and should be leached in smaller amounts from decomposing plant material. An increase in the amount of calcium leached from litter should be paralleled by a similar increase in the amount of potassium or sodium.…”

Section: Cationic Content Of Leachatementioning

confidence: 99%

Nutrient movement into soils beneath eucalypt and exotic conifer forests in southern central Victoria

Feller¹

1978

Austral Ecol

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Above-ground nutrient return to the soil was estimated by studying forest floor leachates for up to 2 years in two eucalypt forests (Eucalyptus obliqua and E. regnans) and two nearby conifer plantations (Pinus radiata and Pseudotsuga menziesii) near Narbethong in southern central Victoria. Forest floor leachate volumes were recorded approximately once a month and samples were analysed for pH and potassium, sodium, magnesium, and calcium concentrations.The volume of forest floor leachate was greater in the eucalypts than in the conifers. This was attributed to greater interception losses of water by the conifers.Forest floor leachate chemistry underwent regular seasonal fluctuations which were similar for each of the four forest types. Acidity was highest in spring and autumn and lowest in summer. Cation concentrations were highest in autumn and lowest in spring. This behaviour was attributed to changes in climate and in rates of litter decomposition.In contrast to cation concentrations, cation quantities entering the soil in forest floor leachate showed no pronounced seasonal variations although they tended to be high in winter. The quantities of cations added to the soil in forest floor leachate varied with forest type, and were significantly higher in E. obliqua than in the comparable P. radiata stand. Greater quantities of acid were added to the soil under P. radiata.The P. radiata soil contained lower quantities of exchangeable cations than the E. obliqua soil. This was consistent with the 0307-692X/78/1200-0357 $02.00 © 1978 Blackwell observed differences in forest floor leachate chemistry. Unlike the P. radiata soil, the P. menziesii soil did not appear to be depleted in exchangeable cations.It was concluded that P. radiata had depleted the exchangeable cation reserves in the soil studied but that the full significance of this is still unknown.

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Section: Cationic Content Of Leachatementioning

confidence: 99%

Nutrient movement into soils beneath eucalypt and exotic conifer forests in southern central Victoria

Feller¹

1978

Austral Ecol

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“…Entretanto, em vista da grave condição de preservação das matas ciliares, com o conseqüente comprometimento da qualidade ambiental das bacias hidrográficas, é urgente o desenvolvimento de modelos que visem não só a recuperação da vegetação ciliar, mas que considerem a reabilitação de suas características estruturais e funcionais, relacionadas à estabilidade do solo e margens dos cursos d'água, retenção de poluentes e sedimentos, hábitat para ocupação de espécies animais, além do fornecimento de alimento e abrigo para a fauna aquática, através da serapilheira despejada pelas árvores ao solo ou carreada diretamente para o curso d'água. Nesse contexto, o estudo da produção de serapilheira tem sido recomendado para avaliar o estado de conservação ambiental de fragmentos florestais nativos ou reflorestados, por se tratar de um processo essencial na restauração e manutenção da fertilidade do solo, pois é o principal caminho para a ciclagem de matéria orgâ-nica e nutrientes, capazes de conferir maior estabilidade ao sistema (Jordan & Kline 1972).…”

Section: Introductionunclassified

Produção de serapilheira em mata ciliar nativa e reflorestada no alto São Francisco, Minas Gerais

Nunes

Pinto

2007

Biota Neotrop.

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Foram estudados dois trechos de vegetação ciliar na região do Alto São Francisco, Minas Gerais, com o objetivo de verificar diferenças na produção de serapilheira. A serapilheira foi coletada entre setembro/2001 e agosto/2002, utilizando-se 10 coletores de 0,25 m 2 em cada trecho. Os resultados obtidos demonstraram uma produção elevada de serapilheira em ambos os trechos de mata, sendo que as folhas predominaram sobre os ramos e estes sobre os órgãos de reprodução nos dois talhões. A mata nativa apresentou um comportamento sazonal de queda de serapilheira, se contrapondo ao reflorestamento, que não apresentou sazonalidade para a queda de serapilheira. Os resultados obtidos estão de acordo com os valores próprios das matas localizadas sobre planícies aluvionares tropicais. Foram encontradas grandes diferenças entre os períodos de maior produção de serapilheira entre a mata ciliar nativa e a reflorestada, para o que estariam agindo de forma conjunta à dinâmica a florística e o estádio sucessional das espécies existentes nos trechos de vegetação estudados.Palavras-chave: mata ciliar, reflorestamento, bacia do rio São Francisco, recuperação de áreas degradadas, conservação.

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“…However, considerable data exists on forest ecosystems [6,10,34] or on the allied systems such as shifting agriculture and taungia systems [12,21,27,29,30]. Little information on nutrient cycling in agroforestry systems is available.…”

Section: Discussionmentioning

confidence: 99%

Structure and function of traditional agroforestry systems in the western Himalaya. II. Nutrient cycling

1989

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Budget of nutrient in plant and soil, and their rates of recycling in three types of traditional agroforestry systems in mid elevations of the western Himalaya were studied. Concentration of nitrogen and potassium was significantly higher in fruits and leaves than in branches, boles, and litter. Grewia optiva, an important fodder tree, was found to be rich in potassium, vegetable crops in nitrogen, and weeds in phosphorus. Maximum store of nutrients was estimated in aboveground biomass of agrihortisilvicultural system: nitrogen 532, phosphorus 40, potassium 461, calcium 400, and magnesium 298 kg/ha; it was closely followed by that in agrihorticultural system, and both these had about 2-fold higher nutrient stock as compared to agrisilvicultural system. In the case of the former two systems, considerable quantity of nutrients up to nitrogen 169, phosphorus 14, potassium 165, calcium 97, and magnesium 65 kg/ha, for example in agrihortisilvicultural system, was recycled through debris of crops and weeds, and tree leaf litter, while the recycling rate was almost half in agrisilvicultural system. Through 'harvest' potassium was depleted in the largest quantity from the system, followed by nitrogen, magnesium, calcium, and phosphorus; much higher loss occurred through agricultural and/or horticultural edible parts as comapred to fuel and fodder biomass. For example, the loss through agricultural crops and horticultural fruits for nitrogen in agrihortisilvicultural system was up to 75 percent and 38 percent respectively of the total annual uptake. This heavy loss makes the system unstable from a nutrient point of view particularly for nitrogen and potassium until external inputs are added through organic and inorganic fertilizers. Agrihortisilvicultural system is remarkably efficient in view of biomass productivity for fuel, fodder and fruits, and also from nutrient point of view provided losses through harvest are compensated externally. 0 Z © ~_ 800

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Mineral Cycling: Some Basic Concepts and Their Application in a Tropical Rain Forest

Cited by 39 publications

References 36 publications

Nutrient movement into soils beneath eucalypt and exotic conifer forests in southern central Victoria

Nutrient movement into soils beneath eucalypt and exotic conifer forests in southern central Victoria

Produção de serapilheira em mata ciliar nativa e reflorestada no alto São Francisco, Minas Gerais

Structure and function of traditional agroforestry systems in the western Himalaya. II. Nutrient cycling

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