Sundaland heath forests

Source: Wikipedia, the free encyclopedia.
Sundaland heath forests
Padang scrub at Bako National Park
Ecoregion territory (in purple)
Ecology
RealmIndomalayan
Biometropical and subtropical moist broadleaf forests
Borders
List
Geography
Area76,130 km2 (29,390 sq mi)
Countries
Conservation
Conservation statuscritical/endangered
Protected6,436 km2 (8%)[1]

The Sundaland heath forests, also known as Kerangas forest, is a type of tropical moist forest found on the island of Borneo, which is divided between Brunei, Indonesia, and Malaysia, as well as on the Indonesian islands of Belitung and Bangka, which lie to the west of Borneo.

Setting

The word Kerangas, which means "land which cannot grow rice", comes from the Iban language. Heath forests occur on acidic sandy soils that are the result of the area's siliceous parent rocks. Permanently waterlogged heath forests are known as kerapah forests.[2] Open-canopied woodlands are known as padang.[3] The sandy soil of the heath forest are often lacking in nutrients; it is generally considered that nitrogen is the nutrient which is most lacking for plant growth in these forests. This is in contrast to many other lowland rain forests where phosphorus is considered to be lacking.[2]

A more recent hypothesis, proposed by Proctor (1999), is that these forests are growing on soils which are highly acidic, such that hydrogen ion toxicity prevents the growth of non-adapted species. Moreover, heath forests' low soil pH hampers organic matter decomposition thus further slowing nutrient cycling.[4][5]

Flora

The Sundaland heath forests are distinct from the surrounding

species composition, structure, texture, and color. The heath forests typically have a low, uniform canopy approximately 20 metres high, with thick underbrush and rich growth of moss and epiphytes. Trees often have closely-spaced trunks.[2] In contrast, padang woodland is relatively open, with shrubs and trees up 5 metres tall, and a ground layer of sparse grasses and sedges.[3]

Leaf sizes are generally smaller than other lowland rain forest trees. As an adaptation to the nutrient-poor conditions, some heath forest species have small, hard, thick

bladderwort (Utricularia spp.), are carnivorous, trapping and digesting insects.[2]

Dipterocarps, including species of Shorea and Hopea, are common canopy trees on less barren soils, along with palms. Native trees include both heath forest endemics, typical lowland forest species, and species shared with peat swamp forests like Shorea albida, Shorea pachyphylla, and Shorea scabrida. Heath forests are also characterized by many plants of Australasian origin, including trees of families Myrtaceae and Casuarinaceae and the southern hemisphere conifers Agathis, Podocarpus, and Dacrydium.[2]

Fauna

The heath forests generally have less wildlife and species diversity than the surrounding lowland rain forests, with little or no endemic species.[2]

Protected areas

9.695% of the ecoregion is in protected areas. These include:[6]

References

  1. ^ Eric Dinerstein, David Olson, et al. (2017). An Ecoregion-Based Approach to Protecting Half the Terrestrial Realm, BioScience, Volume 67, Issue 6, June 2017, Pages 534–545; Supplemental material 2 table S1b. [1]
  2. ^
    Washington, DC
    .
  3. ^ a b c Hazimah Din, Faizah Metali, Rahayu Sukmaria Sukri, "Tree Diversity and Community Composition of the Tutong White Sands, Brunei Darussalam: A Rare Tropical Heath Forest Ecosystem", International Journal of Ecology, vol. 2015, Article ID 807876, 10 pages, 2015. https://doi.org/10.1155/2015/807876
  4. S2CID 218789907
    .
  5. ^ Proctor, J. (1999) "Heath forests and acid soils". Botanical Journal of Scotland 51, 1-14.
  6. ^ Sundaland heath forests. DOPA Explorer. Accessed 1 April 2023.

External links

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