INFLUENCE OF ELEVATED ATMOSPHERIC CO2 CONCENTRATIONS ON PLANT NUTRITION

被引:73
作者
CONROY, JP
机构
[1] University of Western Sydney, Hawkesbury, Richmond, NSW, 2753, Bourke Street
关键词
D O I
10.1071/BT9920445
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The rising levels of atmospheric CO2 are likely to increase biomass production of C3 species in both natural and managed ecosystems because photosynthetic rates will be higher. The greatest absolute increase in productivity will occur when nitrogen and phosphorus availability in the soil is high. Low nitrogen does not preclude a growth response to high CO2, whereas some C3 species fail to respond to high CO2 when phosphorus is low, possibly because insufficient phosphorus is available to maintain maximum photosynthetic activity at high CO2. C3 plants response to high CO2 because the flux of carbon through the photoreductive cycle is increased and photorespiration is suppressed. This change in metabolism appears to alter the foliar nutrient concentration required to promote maximum productivity (critical concentration). Higher phosphorus concentrations are needed at elevated CO2, whereas the nitrogen requirement is reduced by CO2 enrichment. Since critical concentrations are used to evaluate nutrient status of crop and forest species and to manage fertiliser programs, they will need reassessing as the atmospheric CO2 concentration rises. Another consequence of the altered nutrient requirement at high CO2 is that the nitrogen concentrations of foliage, roots and grain are consistently lower in plants grown at elevated CO2, irrespective of availability of nitrogen in the soil. In natural ecosystems, the lower nitrogen to carbon ratio of the litter may alter rates of nutrient cycling. For farmers, the rising CO2 concentrations could cause reductions in grain nitrogen, and therefore protein content. This could have important implications for baking quality of hard wheats as well as affecting the nutrient value of grain such as rice.
引用
收藏
页码:445 / 456
页数:12
相关论文
共 35 条
[11]  
DUDAL R, 1978, PLANT ADAPTATION MIN, P3
[12]   NITROGEN CONCENTRATIONS IN SPRING WHEAT AT SEVERAL GROWTH-STAGES [J].
ENGEL, RE ;
ZUBRISKI, JC .
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS, 1982, 13 (07) :531-544
[13]  
Evans J.R., 1989, PHOTOSYNTHESIS, P183
[14]  
Gifford R. M., 1988, Greenhouse: planning for climate change. Papers presented at the Greenhouse 87 Conference, Monash University, Melbourne, Australia 1987., P506
[15]   CARBON-DIOXIDE ENRICHMENT DECREASES CRITICAL NITRATE AND NITROGEN CONCENTRATIONS IN WHEAT [J].
HOCKING, PJ ;
MEYER, CP .
JOURNAL OF PLANT NUTRITION, 1991, 14 (06) :571-584
[16]   EFFECTS OF CO2 ENRICHMENT AND NITROGEN STRESS ON GROWTH, AND PARTITIONING OF DRY-MATTER AND NITROGEN IN WHEAT AND MAIZE [J].
HOCKING, PJ ;
MEYER, CP .
AUSTRALIAN JOURNAL OF PLANT PHYSIOLOGY, 1991, 18 (04) :339-356
[17]   CO2 ENRICHMENT OF SOUR ORANGE TREES - 2.5 YEARS INTO A LONG-TERM EXPERIMENT [J].
IDSO, SB ;
KIMBALL, BA ;
ALLEN, SG .
PLANT CELL AND ENVIRONMENT, 1991, 14 (03) :351-353
[18]   CARBON-DIOXIDE AND AGRICULTURAL YIELD - AN ASSEMBLAGE AND ANALYSIS OF 430 PRIOR OBSERVATIONS [J].
KIMBALL, BA .
AGRONOMY JOURNAL, 1983, 75 (05) :779-788
[19]   EFFECTS OF NITROGEN NUTRITION ON NITROGEN PARTITIONING BETWEEN CHLOROPLASTS AND MITOCHONDRIA IN PEA AND WHEAT [J].
MAKINO, A ;
OSMOND, B .
PLANT PHYSIOLOGY, 1991, 96 (02) :355-362
[20]  
Moorby J., 1983, Inorganic plant nutrition, P481