Chapter 11 - 1 Photosynthesis : the Process
نویسنده
چکیده
What Is Productivity? In primary productivity of plants, solar energy is transformed to biomass. Using photosynthesis, green plants convert solar energy, carbon dioxide, and water to glucose and other carbon-based compounds and eventually to plant tissue. Gross primary productivity is the product of that photosynthetic fixation of carbon, whereas net primary productivity is the carbon that is actually converted into biomass, i.e., the fixed carbon that remains once one subtracts that lost to respiration. Consider it like your income. The gross value is your salary, but the net is what is left after taxes, social security, and other "maintenance" deductions. Respiration is the maintenance tax the plant must pay from its gross carbon fixation. Productivity might be considered the measure of success of a plant. As stated by Anderson et al. (1996), photosynthesis provides energy, organic matter, and oxygen for nearly all biotic processes, and it is the only renewable energy source on Earth. If productivity is reduced in the presence of another species, we assume a competitive interaction that deprives the species of some needed resource. Thus, we might think of productivity as being the central issue in ecology around which all other issues revolve. In order to understand bryophyte productivity, it is necessary to understand the differences in the bryophyte photosynthetic apparatus, especially the structure of the leaf or phyllid, compared to that of higher plants. I included the term phyllid here because technically, the bryophyte has no true leaves. This is because bryophytes lack lignified vascular tissue. However, few bryologists use the term phyllid, but rather have chosen to retain the term leaf, recognizing that the structure is different.
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تاریخ انتشار 2007