BIOL1012 Lecture Notes - Lecture 30: Proceedings Of The National Academy Of Sciences Of The United States Of America, Spinach, Sea Level Rise
Document Summary
An ecological effect of homo sapiens : anthropogenic co2. From sage (1999), c4 plant biology, figure 2. 280 ppm: since 1958 direct measurements in hawaii show changes from ~320 to ~398 ppm today, note that other greenhouse gases have also increased considerably, particularly ch4. Carbon cycle greenhouse gas measurement sites: 68 active sites globally, run by noaa, mauna loa is on hawaii (literally, the big island), relatively far from significant industrial activity http://www. esrl. noaa. gov/gmd/obop/mlo/index. html. 2050: anthropogenic co2 may affect this, because in today"s atmosphere photosynthesis not co2 saturated. Kubien & sage (2008) plant cell & environment 31:407. [substrate: it reduces the inhibitory effect of o2 on photosynthesis. Ribulose-1, 5-bisphosphate carboxylase/oxygenase: at 25oc in today"s atmosphere, land-plant rubisco fixes roughly 4 co2 for every o2, but at 35oc it is only 2:1. 2 m l o m (cid:80) s i s e h t n y s o t o h.
