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Lesson 4 - Cycling of Matter in Ecosystems
Transcript of Lesson 4 - Cycling of Matter in Ecosystems
Section 2.6 in textbook Like humans, all life on earth requires
water and nutrients. Water provides the liquid component for cells while nutrients are the sources the building materials and chemical energy. We obtain matter from the food we eat,
the water we drink, and the air we breath. The particles of matter
do not stay in our bodies
forever. Every cell in your body is
replaced over time. That's over 2 million red blood cells every second...of EVERY DAY!!! Scientists estimate that on average,
every particle in a human body is
replaced at least once every 7 years! Particles of matter cannot be created or destroyed. Everything is created from things
that already exist in nature. Matter moves through series of cycles. Involve living (bio) organisms and occur as Earth (geo) processes. Biogeochemical cycle is the movement of matter through the biotic and abiotic environment. Water evaporates creating water vapour. Water condenses, forming liquid water or ice crystals,
returning to Earth as rain, hail, or snow. Water enters soil and groundwater or moves
across the surface entering lakes, rivers and oceans. Water that is taken in by plant
roots may be released from leaves
via transpiration. Most water is present in the cycle
in the abiotic environment. The carbon cycle is the biogeochemical cycle in which
carbon is cycled through the lithosphere, atmosphere,
hydrosphere, and biosphere. Most of the Earth's carbon is not cycled.
Stored in carbon-rich deposits. Fossil fuels,
like coal, oil, and natural gas. Also stored in
limestone for millions of years (dead marine
organisms). Large quantities also contained in
plant tissue and dissolved as carbon
dioxide in the world's oceans. These locations are referred to as carbon
sinks because carbon can enter or leave over
a relatively short time. Human activities have dramatic effects on the carbon cycle. By burning fossil fuels, humans release stored carbon into the atmosphere. The levels of carbon dioxide in the
atmosphere is at its highest point
in 800 000 years. This is causing
global climate change. This increase in CO2 levels has
caused in increase in the average
temperature, melting ice caps and glaciers,
causing sea levels to rise, and disrupting
ECOSYSTEMS!!! The nitrogen cycle is a series of processes
in which nitrogen compounds are moved
through the biotic and abiotic environment. The majority of nitrogen is taken from the
atmosphere by certain bacteria through
nitrogen fixation. Nitrates, Nitrites, and Ammonia are created
by conversion of atmospheric nitrogen by
bacteria. Once nitrogen-rich compounds in the soil ecosystem, they
are available to producers. Nitrogen is absorbed, passed from
producer to consumer and up the food chain. When an organism dies, nitrogen is
released back into the environment.
Recycling occurs and either the nitrogen
remains in the soil or gets converted back into atmospheric nitrogen. The water cycle is a series of processes
that cycle water through the environment.