International Journal of Ecology

Research Article

Understanding Crop Response to Climate Variability with Complex Agroecosystem Models

Table 1

Site and vegetation input parameters for Biome-BGC model. Type site refers to physical characteristics of the site, whereas type vegetation refers to ecophysiological constants with description of the vegetation type to be simulated. The units specified as dim indicate dimensionless. Model predictions are most sensitive to parameters indicated in bold.


No.	Type	Parameter description	Symbol	Units

(1)	Site	Atmospheric CO₂ concentration	CO₂	ppm
(2)	Site	Effective soil depth (corrected for rock fraction)		m
(3)	Site	Soil texture: sand percentage by volume	Sand	%
(4)	Site	Soil texture: silt percentage by volume	Silt	%
(5)	Site	Soil texture: clay percentage by volume	Clay	%
(6)	Site	Site elevation	Elev	m
(7)	Site	Site latitude	Lat	degrees
(8)	Site	Site shortwave albedo	Alb	dim
(9)	Site	Wet and dry atmospheric deposition of N	N _dep	kgN/m²/yr
(10)	Site	Symbiotic and asymbiotic fixation of N	N _fix	kgN/m²/yr
(11)	Veg.	Woody or nonwoody	W	flag
(12)	Veg.	Evergreen or deciduous	E	flag
(13)	Veg.	C3 PSN or C4 PSN	G	flag
(14)	Veg.	Model/user-specified phenology	Ph	flag
(15)	Veg.	Yearday to start new growth	NewG	yday
(16)	Veg.	Yearday to end litterfall	EndL	yday
(17)	Veg.	Transfer growth period as fraction of growing season		prop
(18)	Veg.	Litterfall as fraction of growing season		prop
(19)	Veg.	Annual leaf and fine root turnover fraction		1/year
(20)	Veg.	Annual live wood turnover fraction		1/year
(21)	Veg.	Annual whole-plant mortality fraction		1/year
(22)	Veg.	Annual fire mortality fraction		1/year
(23)	Veg.	New fine root C : new leaf C	FRC : LC	dim
(24)	Veg.	New stem C : new leaf C	SC : LC	dim
(25)	Veg.	New live wood C : new total wood C	LWC : TWC	dim
(26)	Veg.	New root C : new stem C	CRC : SC	dim
(27)	Veg.	Current growth proportion	CG	prop
(28)	Veg.	C : N of leaves	C : N _leaf	kgC/kgN
(29)	Veg.	C : N of leaf litter, after translocation	C : N _lit	kgC/kgN
(30)	Veg.	C : N of fine roots	C : N _fr	kgC/kgN
(31)	Veg.	C : N of live wood	C : N _lw	kgC/kgN
(32)	Veg.	C : N of dead wood	C : N _dw	kgC/kgN
(33)	Veg.	Leaf litter labile proportion	FR _lab	prop
(34)	Veg.	Leaf litter cellulose proportion	FR _cel	prop
(35)	Veg.	Leaf litter lignin proportion	FR _lig	prop
(36)	Veg.	Fine root labile proportion	L _lab	prop
(37)	Veg.	Fine root cellulose proportion	L _cel	prop
(38)	Veg.	Fine root lignin proportion	L _lig	prop
(39)	Veg.	Dead wood cellulose proportion	DW _cel	prop
(40)	Veg.	Dead wood lignin proportion	DW _lig	prop
(41)	Veg.	Canopy water interception coefficient	W _int	1/LAI/d
(42)	Veg.	Canopy light extinction coefficient		dim
(43)	Veg.	All sided to projected leaf area ration	LAI _all:proj	dim
(44)	Veg.	Canopy average SLA	SLA	M²/kgC
(45)	Veg.	Shaded SLA in shaded to sunlit SLA ration	SLA _shd:sun	dim
(46)	Veg.	Fraction of leaf N in rubisco	NR	prop
(47)	Veg.	Maximum stomatal conductance		m/s
(48)	Veg.	Leaf cuticular conductance		m/s
(49)	Veg.	Leaf boundary layer conductance		m/s
(50)	Veg.	Leaf WP—start of conductance reduction	LWP_i	MPa
(51)	Veg.	Leaf WP—completion of conductance reduction	LWP_f	MPa
(52)	Veg.	VPD—start of conductance reduction	VPD_i	Pa
(53)	Veg.	VPD—completion of conductance reduction	VPD_f	Pa