[轉貼]为什么每次换水后水草的光合作用就变的旺盛？

bb999 · **註冊時間:** 2004-09-12 16:12 **文章:** 148

有一定水草饲养经验的鱼友都知道，每次换水可以促进水草的光合
作用，但究竟是什么原因，我想知道的人一定不多，有人说是因为
水草喜欢新鲜的水，还有人觉得新水可以溶解更多CO2。。。。你
觉得呢？
事实上，这是由于水草之间的生存竞争所引起的问题，水草之间的
生存竞争是一种天性，不同水草或相同水草之间，为了生存，它们
会在水族箱中互相竞争资源，包括光线、养分和CO2等，生存竞争
优越性的表现，每一种水草都不同。若环境中的生存资源充裕，水
草仅表现很少程度的竞争，若环境资源贫乏，这时一种具有生存竞
争优越性的水草，能在其生长环境中设法排除另一种水草的生存。
参与竞争的水草，能分泌或产生有毒的物质释放于水中，直接或间
接地抑制竞争者的生长，这种现象称为毒他性，毒他性仅发生在不
同品种的水草之间，相同品种所释放出来的毒素彼此之间均有免疫
力，不同水草所释放出来的毒他物质的种类和性能大部分都不同，
其中有一些会抑制水草的光合作用，例如醌可以抑制水草对CO2的
固定作用，使水草的光合作用明显降低。
水族箱是一个封闭的环境，如果长期不换水，这类物质很容易慢慢
累积在水中，到最后使得大部分的水草光合作用被完全抑制下来，
如果有定期的换水，它们的浓度就被稀释，毒他性也大大降低，这
就是换水可以促进水草光合作用的原因。

http://www.sun-aqua.net/ShowArticle.asp?ArticleID=43

mang · **註冊時間:** 2004-10-18 01:32 **文章:** 198

>> 参与竞争的水草，能分泌或产生有毒的物质释放于水中，直接或间
接地抑制竞争者的生长 ..相信性不高

但 >> 换水后水草的光合作用就变的旺盛 ..可以相信

大猩猩王~ · **發表於 :** 2005-01-11 18:11

[quote="mang"]>>

mang · **註冊時間:** 2004-10-18 01:32 **文章:** 198

产生有毒的物质(what?)释放于水中(How?)抑制竞争者的生长,
then 它自己(水草)是否就变旺盛而沒有中毒?? impossible

大猩猩王~ · **發表於 :** 2005-01-11 19:04

[quote="mang"]产生有毒的物质(what?)释放于水中(How?)抑制竞

mang · **註冊時間:** 2004-10-18 01:32 **文章:** 198

To 大猩猩王~,

right ! so i think that 毒性在生物層面產生, not in 水草..

果汁先生 · **發表於 :** 2005-01-11 20:34

bb999 寫:

.............生存竞争是一种天性，不同水草或相同水草之间，为了生存，它们会在水族箱中互相竞争资源，包括光线、养分和CO2等，生存竞争优越性的表现，.....，若环境资源贫乏，这时一种具有生存竞争优越性的水草，能在其生长环境中设法排除另一种水草的生存。....

I believe in that.

Competition exists everywhere and at every moment.
I've been suffering for years.

Thanks for your information.

大猩猩王~ · **發表於 :** 2005-01-11 20:35

mang 寫:

To 大猩猩王~,

right ! so i think that 毒性在生物層面產生, not in 水草..

但..唔可以完全排除水草亦會產生毒性哩個可能架啵..
最衰動物片好少講水草啦~哈哈~
如果唔係就有福喇~^^~

ps.水草亦例入生物層面之列~

alder · **發表於 :** 2005-01-11 22:17

It is only hypothesis until you get supporting data. such as chemical formula, the mechanism..............

果汁先生 · **發表於 :** 2005-01-11 22:29

alder 寫:

It is only hypothesis until you get supporting data. such as chemical formula, the mechanism..............

Any counter data please !

大猩猩王~ · **發表於 :** 2005-01-11 22:32

果汁先生寫:

alder 寫:

It is only hypothesis until you get supporting data. such as chemical formula, the mechanism..............

Any counter data please !

生物科好似係靠觀察結果去作出結論的..

..

但..毒素哩家o野..唔係話check就check架啵..

alder · **發表於 :** 2005-01-11 23:12

果汁先生寫:

alder 寫:

It is only hypothesis until you get supporting data. such as chemical formula, the mechanism..............

Any counter data please !

You are funny. I believe that only the one who purpose the hypothesis is responsible to prove and provide supporting data.

alder · **發表於 :** 2005-01-11 23:17

大猩猩王~ 寫:

果汁先生寫:

alder 寫:

It is only hypothesis until you get supporting data. such as chemical formula, the mechanism..............

Any counter data please !

生物科好似係靠觀察結果去作出結論的..

..

但..毒素哩家o野..唔係話check就check架啵..

At least, you need to set up two or more similar aquarium tanks in controlled environment for comparisons, some tanks for variables and some or aleast one as a control.

Andy Kong · **發表於 :** 2005-01-12 11:55

alder 寫:

大猩猩王~ 寫:

果汁先生寫:

alder 寫:

It is only hypothesis until you get supporting data. such as chemical formula, the mechanism..............

Any counter data please !

生物科好似係靠觀察結果去作出結論的..

..

但..毒素哩家o野..唔係話check就check架啵..

At least, you need to set up two or more similar aquarium tanks in controlled environment for comparisons, some tanks for variables and some or aleast one as a control.

What is the control variables?

If we keep everything the same, one tank with regular water changes, one without, then you can obtain data regarding the implication of changing water. However, this doesn't seem to be the hypothesis.

When you design a control experiment, the first thing you need to sort out is Measurement, what exactly you want to measure, how to measure, do you have the tool to do that? For what have been discussed so far, I think we need to find out if plant will release toxic material, I have no idea how to measure it, maybe I am naive, so I welcome anyone come forth with a valid measurement tools. Without this, we probably have to settle with an observation that can't be explained at this moment, which is very common in Scientific world.

YKK · **發表於 :** 2005-01-12 13:22

不敢評論毒他性對光合作用的影響, 只看過文章說一些水草比較能抗藻.

如 "换水可以促进水草的光合作用" 是建基於"出泡量多", 就有另一個看法可以討論一下吧.

以前看台灣書說, "换水可以增加出泡量", 但出泡量不只是水草光合作用的指標(出氧), 亦是生物需氧量的指標(耗氧).

環保團體用氧氣飽和度來量度水中污染物, 是因為細菌需要氧氣去分解污染物. 换水減少污染物, 細菌需氧量減少, 氧氣飽和度增加, 氧氣快飽和, 飽和就出泡, 出泡快便會泡量多.

所以泡量多了不一定是光合作用快了. 要証明光合作用快了, 看水草的生長會比較客觀.

YKK

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[轉貼]为什么每次换水后水草的光合作用就变的旺盛？

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