Productivity of well-watered Panicum virgatum does not increase with CO_(2) enrichment
作者机构：USDA-ARS Grassland Soil and Water Research Laboratory808 E Blackland RdTempleTX 76502USA USDA-ARS Agroecosystem Management Research137 Keim HallUniversity of Nebraska-LincolnLincolnNE 68583USA Section of Integrative Biology1 University StationC0930University of Texas at AustinAustinTX 78712USA
出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)
年 卷 期：2012年第5卷第4期
页 面：366-375页
核心收录：
主 题：switchgrass bioenergy resource allocation tillering meristem limitation
摘 要：Aims Rising atmospheric CO_(2) has been shown to increase aboveground net primary productivity(ANPP)in water-limited perennial grasslands,in part by reducing stomatal conductance and transpiration,thereby reducing depletion of soil ***,the benefits of CO_(2) enrichment for ANPP will vary with soil type and may be reduced if water limitation is *** is known about CO_(2) effects on ANPP of Panicum virgatum,a perennial C4 tallgrass and potential bioenergy *** hypothesized that if water limitation is minimized,(i)CO_(2) enrichment would not increase *** ANPP because photosynthetic rates of this C4 grass would not increase and because decreased transpiration at elevated CO_(2) would provide little additional benefit in increased soil moisture and(ii)soil type will have little effect on *** CO_(2) responses because of high overall soil *** Growth and leaf physiology of *** cv.‘Alamo’were studied as plants established for 4 years on silty clay and clay soils along a 250 to 500 ll l-1 gradient in atmospheric CO_(2) located in central Texas,*** were watered to replace evapotranspiration,fertilized with NO_(3)NH_(4) and P_(2)O_(5) and clipped to standard height during *** Findings ANPP increased through the third year of *** moisture(0–20 cm),ANPP,tiller numbers and leaf area index were 8–18%higher on the clay than on the silty clay *** did not increase with CO_(2) except in the planting ***,biomass removed with clipping strongly increased with CO_(2) in years 2 and 3,suggesting that CO_(2) enrichment increased the early-to mid-season growth of establishing *** but not later regrowth or that of fully established ***,CO_(2) enrichment differentially affected two components of ANPP in years 2 and 3,increasing tiller mass and reducing tiller *** reallocation of resources in clipped *** suggested increased meristem limitation of productivi
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