Short-term and long-term effects of tannins on nitrogen mineralisation and litter decomposition in kauri (Agathis australis (D. Don) Lindl.) forests

  title={Short-term and long-term effects of tannins on nitrogen mineralisation and litter decomposition in kauri (Agathis australis (D. Don) Lindl.) forests},
  author={Eric Verkaik and A. G. Jongkind and Frank Berendse},
  journal={Plant and Soil},
Kauri (Agathis australis (D. Don) Lindl.) occurs naturally in the warm temperate forest of northern New Zealand where it grows mixed with angiosperm tree species. Below mature kauri trees thick organic layers develop in which large amounts of nitrogen are accumulated. This nitrogen seems to be inaccessible to plants. While litter quality can explain the low decomposition rate below kauri, it is not known what causes the accumulation of nitrogen. We hypothesised that kauri tannins reduce… 

Low soil water and nutrient availability below New Zealand kauri (Agathis australis (D. Don) Lindl.) trees increase the relative fitness of kauri seedlings

Low soil moistureavailability, or the combination of low soil moisture availability and low nutrient fertility, hampers the growth of kauri as well as mapau seedlings below kauri trees.

Do late-successional tannin-rich plant communities occurring on highly acidic soils increase the DON/DIN ratio?

Previous studies suggested that late-successional tannin-rich plant communities increase the amount of dissolved organic N (DON) relative to dissolved inorganic N (DIN) in decomposing litter. We

Net nitrogen mineralization and enzyme activities in an alpine meadow soil amended with litter tannins

Condensed tannins in plant litter play an important role in soil nitrogen (N) cycling at the plant–soil interface. However, how soil net N mineralization is affected by litter tannins through their

Growth responses of five forest plant species to the soils formed beneath New Zealand kauri (Agathis australis)

Compared soils under kauri and adjacent broadleaved forest on the growth and nitrogen status of five forest plant species of varying levels of association with kauri are consistent with a link between kauri-induced soil conditions and plant community composition.

Abundance and diversity of total and nitrifying prokaryotes as influenced by biochemical quality of organic inputs, mineral nitrogen fertilizer and soil texture in tropical agro-ecosystems

Tropical agro-ecosystems are limited in nutrient resources as a consequence of i) being composed of highly weathered soils, ii) low native soil organic matter (SOM) content due to conversion of

Kauri trees (Agathis australis) affect nutrient, water and light availability for their seedlings

Kauri seedlings are more tolerant of drought and low nutrient availability than other tree seedlings and it is suggested that periodic drought explains why the density of kauri seedling under mature kauri trees is less than in tea tree vegetation.

Slow decomposition of leaf litter from mature Fagus sylvatica trees promotes offspring nitrogen acquisition by interacting with ectomycorrhizal fungi

Increasing N retention within the recalcitrant N forms in soil was identified as a key mechanism by which beech alters soil N cycling with potential positive feedbacks on its acquisition by the plant.

Site conditions affect seedling distribution below and outside the crown of kauri trees (Agathis australis)

The results confirm the hypotheses and indicate that the establishment of kauri seedlings is favoured by the open canopy and high light intensities below kauri, suggesting that a positive feedback between kauri and the soil is likely.

Nitrogen transformations in boreal forest soils—does composition of plant secondary compounds give any explanations?

Two major groups of plant secondary compounds, phenolic compounds and terpenes, may according to current evidence mediate changes in soil C and N cycling, but their exact role and importance in



Decomposition of litter from common woody species of kauri (Agathis australis Salisb.) forest in northern New Zealand

Investigation of rates of weight loss and release of Na, K, Ca, Mg and P for common components of kauri forest litterfall in experiments using mesh bags found loss of weight and nutrients was faster for freshly picked green leaves than for senesced leaves.

Effects of balsam poplar (Populus balsamifera) tannins and low molecular weight phenolics on microbial activity in taiga floodplain soil: implications for changes in N cycling during succession

By inhibiting mineralization while stimulating immobilization, poplar secondary compounds may reduce soil N-availability during the transition betwen alder and poplar stages in interior Alaska.

The biology of kauri (Agathis australis) in New Zealand 11. Nitrogen cycling in four kauri forest remnants

There is a close linear relationship between both stem productivity and litter production and maximum foliage N in any stand and this has important implications for management of kauri forest.

The biology of kauri (Agathis australis) in New Zealand. I. Production, biomass, carbon storage, and litter fall in four forest remnants

Forest floor accumulation of litter in kauri forest is extremely high with mean residence time of 9–78 years, and sites with higher litter fall are accompanied by faster breakdown, but at all sites litter decomposition is slow.

Changes to mineral N cycling and microbial communities in black spruce humus after additions of (NH4)2SO4 and condensed tannins extracted from Kalmia angustifolia and balsam ®r

Mechanisms responsible for conifer growth ``check'' on cutovers invaded by Kalmia angustifolia L. in central Newfoundland were studied by examining e€ects of added Kalmia and balsam ®r (Abies

Litterfall dynamics in a mixed conifer‐angiosperm forest in northern New Zealand

Differences in the costs of biomass production and rates of turnover, as measured by litterfall and decomposition, may help to explain the functional coexistence of conifers and angiosperms in mixed forests.