水草情迷

有人知道大自然的co2是從何而來? (當然是指水草的生活環境啦~) :

In nature, respiration from living things (e.g. plants and animals) would use oxygen and release CO2.

Also, CO2 can also be released by burning things, like burning wood, fuel and so on.

In the past, the earth has a well balance of CO2 concentration. CO2 released from the above processes would be use up by plants. However, in recent decades, man starts to use too much energy and release too much CO2 to the atmosphere. And a result, the high concentration of CO2 creats the green house effect and makes the temp. go up.

1. dissolve from atmosphere (CO2 generated by human, artifacts - cars, burning of fossil fuel, ....)
2. animals in water...

You guys are really expert ar!!!

However, i would like to know, as fishes are also in our tank, why we need to put additional CO2 (fish releases co2) for our home aquarium while the natural plants still able to survive perfectly under natural environment without additional co2 supply??

在現代，魚缸還不能100%模仿大自然啊！
大自然的ecosystem是很龐大和精細的呀！
如果魚缸細細的是可以不用加CO2設備的啊！

GP03SE

oh yes... i agree.. its eco-system! very complicated and involved many factors. Really needs time to learn but interesting!

In nature, CO2 is usually not the limiting factor for the growth of plants, other factors such as light and nutrients would be more important than CO2. And it fact, plants in nature would grow slower than those in aquarium because they don't have unlimited supply of resource.

By contrast, in aquarium, we usually put sufficient or excess light and nutrients supplies to a tank, so these two limiting factors are eliminated, instead CO2 would be the next limiting factor for the growth of plants. To sort out this problem we have to put addition CO2 into the tank for the plant.

So, without good supplies of light and nutrients, pumping CO2 into a tank would not make a real difference for plant growth

Adding to the list of source of carbon dioxide in natural water:

Rocks which contain carbonate release carbon dioxide into the surrounding water. Hence the source of CO2 in natural water body is unlimited.

大部份水草其實都係兩棲類,一年之中,只有部份時間係完全在水底生長,其餘時間都係水上生長,可以係空氣裏吸收CO2,但種係魚缸的水草,整年都係水裏生長(除非係水陸缸),所以要外加CO2,又例如鹿角苔本來係浮水植物,根本可以在水面吸到CO2,但種在魚缸裏時,係扎在沉木或石頭沉在水裏,一定要外加CO2先可以種到. 如果你有睇過最近的花鳥魚展,你應該見過其中一項展品係一盆有幾種不同植物種係水上,其實全部都係平時買到的水草,只不過係在水草種植場時的水上葉形態.
http://www.tropica.com/article.asp?type ... tic&id=205
http://www.tropica.com/article.asp?type ... tic&id=201

Most CO2 generated by decomposition or by fermentation. Other sources such as respiration (mentioned in other posts), and nitrofication.

大自然的co2,...
當下雨的時侯,雨水會將空氣中的co2帶到水中