Blue carbon02/10 - gpp etc - Npp etc

8 important questions on Blue carbon02/10 - gpp etc - Npp etc

What does the plant respiration consist of?

Rplant = Rgrowth + Rmaint + Rion

growth respiration
maintenance respiration
cost of ion absorption

How much does r maint account for plant respiration?

About 50%
depends on environmental conditions ● increases with temperature because of increased degradation of proteins and membrane lipids ● drought increases cost of maintaining ion gradients

How do photosynthesis and biomass growth interact(feedback loop)?

Short term photosynthesis regulates biomass growth long term it is the other way around

● on short timescales (seconds to days) light and water availability largely determine photosynthetic C gain
● on monthly to annual timescales, plants adjust leaf area and photosynthetic capacity to available soil resources needed for growth
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What is the relationship between NPP and precipitation and temperature?

▪ NPP is greatest in warm moist environments and lowest in cold or dry ecosystems. In tropical forests, NPP declines at extremely high precipitation due to indirect effects of excess moisture, such as low soil oxygen and loss of nutrients through leaching.

Is the efffect of temperature on NPP direct?

The climate-NPP correlation probably reflects temperature effects on nitrogen supply or length of growing season more than a direct temperature effect on NPP

What is the allocation when talking about plants?

is the distribution of growth among plant parts that maximises growth in response to the balance between aboveground and belowground resource supply rates

What is the dillema of allocation for plants?

Leaves increase c uptake
roots increase nutrient or wate ruptake

What is liebigs law?

Plant growth is controlled not by the total amount of resources available, but by the scarcest resource (limiting factor)

the one factor that limits the most limits the growth.

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