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The effects of temporal variation in soil carbon inputs on resource allocation in an annual plant

Journal of Plant Ecology 2016年第1期9卷 30-39页

作者： Hagai Shemesh Uri Ben-Yosef Stav Livne Ofer Ovadia Department of Environmental Sciences Tel-Hai Academic CollegeUpper Galilee 12208Israel Department of Life Sciences Ben-Gurion University of the NegevPOB 653 Beer Sheva 8410501Israel

Aims Resource allocation in plants can be strongly affected by *** plant–plant interactions,terrestrial plants compete with the soil bacterial community over *** the bacterial communities cannot synthesize their own energy sources,they are dependent on external carbon *** the effect of overall amounts of carbon(added to the soil)on plant performance,the effect of fine scale temporal variation in soil carbon inputs on the bacterial biomass and its cascading effects on plant growth are largely *** hypothesize that continuous carbon supply(small temporal variance)will result in a relatively constant bacterial biomass that will effectively compete with plants for *** the other hand,carbon pulses(large temporal variance)are expected to cause oscillations in bacterial biomass,enabling plants temporal escape from competition and possibly enabling increased *** thus predicted that continuous carbon supply would increase root allocation at the expense of decreased reproductive *** also expected this effect to be noticeable only when sufficient nutrients were present in the *** Wheat plants were grown for 64 days in pots containing either sterilized or inoculated soils,with or without slow-release fertilizer,subjected to one of the following six carbon treatments:daily(1.5mg glucose),every other day(3mg glucose),4 days(6mg glucose),8 days(12mg glucose),16 days(24mg glucose)and no carbon *** Findings Remarkably,carbon pulses(every 2–16 days)led to increased reproductive allocation at the expense of decreased root allocation in plants growing in inoculated *** with our prediction,these effects were noticeable only when sufficient nutrients were present in the ***,soil inoculation in plants subjected to low nutrient availability resulted in decreased total plant *** interpret this to mean that when the amount of available nutrients is low,these nutrients are

关键词： resource allocation temporal variation soil carbon inputs immobilization microbial loop Triticum

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