Koleksi Tumbuhan


Filed under: Paya bakau — zainura66 @ 10:08 am

Avicennia have the highest salt tolerance of mangrove trees. They do not exclude salts at the root level. In fact, their sap is salty, at about one-tenth that of sea water. Instead, they secrete excess salt on their leaves through special pores, to be removed by rain or wind. Sometimes, the salt can be seen as a white crystalline layer on the upper surface of the leaf. To avoid suffocation in the oxygen poor (anaerobic) mud, they have pencil-like pneumatophores. These stick out at regular intervals from long shallow underground cable roots that spread out from the trunk to stabilise the tree.
The tiny flowers are hermaphroditic; female flowers producing sterile pollen while male flowers produce sterile ovules. Both types produce lots of nectar and fragrance to attract insect pollinators. Avicennia produces some of the best honey.
While the seed does germinate on the mother tree, the growing shoot does not penetrate the seed coat while the fruit is still on the tree (thus this is called cryptovivipary). The shoot and roots only appear after the fruit falls off. And these grow best in water of the right temperature and salinity.
Because Avicennia species regenerate branches easily from their trunk, it is possible to harvest branches without hurting the tree and maintain mangroves for such harvests (called coppicing). Avicennia is among the few used in replanting mangroves to protect coastlines (the others are Sonneratia and Rhizophora).
Role in the habitat: Being able to tolerate saltwater, Avicennia are among the first mangrove trees to colonise mud and sandbanks which are regularly flooded by seawater. Thus the trees stabilise the shores, preventing erosion and allowing other plants to grow.

About these ads

2 Responses to “API-API (Avicennia spp); SEJARAH SERTA KEISTIMEWANNYA”

  1. I got this website from my buddy who informed me concerning this web page and now this
    time I am browsing this web site and reading very informative articles or reviews at this place.

  2. Celinda Says:

    Every weekend i used to pay a visit this web page, for the reason that i want enjoyment,
    for the reason that this this website conations really nice funny data too.

Tinggalkan Jawapan

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Tukar )

Twitter picture

You are commenting using your Twitter account. Log Out / Tukar )

Facebook photo

You are commenting using your Facebook account. Log Out / Tukar )

Google+ photo

You are commenting using your Google+ account. Log Out / Tukar )

Connecting to %s


Get every new post delivered to your Inbox.

Join 74 other followers

%d bloggers like this: