Simulating the impact of climate change on the growth of Chinese fir plantations in Fujian province, China

New Zealand Journal of Forestry Science

Table 1 Parameter values in the ForWaDy submodel relevant for the simulation of plant available water, transpiration and water stress on a mesic site

Soil variables	Edaphic class	Soil texture class		Coarse fragment (%)	Mineral soil depth (cm)		Field capacity moisture content (θ)
Soil variables	Mesic site	Silt loam		25	85		0.25
Soil water extraction and transpiration	Species	Maximum LAI^a	Canopy parameters		Permanent wilting point^d (%)		Maximum root depth^e (cm)
	Species	Maximum LAI^a	Albedo^b	Resistance^c	Humus	Mineral soil	Maximum root depth^e (cm)
	Chinese fir	4.5	0.12	0.3	0.07	0.09	100
	Shrubs	NA	0.12	0.25	0.08	0.1	100
	Grass	NA	0.12	0.2	0.07	0.09	75

^aSets the upper limit for LAI by species. LAI is determined as a function of simulated foliage biomass. Not applicable (NA) for understorey vegetation
^bEstimated values
^c“Canopy resistance” represents a general measure of the resistance to water loss from foliage via stomata and cuticle. It is used to adjust the α value in the Priestley-Taylor equation to represent the amount of stomatal control on transpiration from a dry canopy based upon the relationship RCan = 1 − (α/1.26) (Seely et al. 2015). An α value of 1.26 represents a freely evaporating surface, a canopy resistance value of 0.3 would reduce the α value to approximately 0.88. The value 0.3 for Chinese fir was estimated based upon the physical characteristics of its foliage and its known climate niche in comparison to other species for which values of canopy resistance have been measured (dry pine = 0.45, Douglas fir = 0.33, non-sclerophyllic broad leaves 0.13, see Seely et al. (2015))
^dRefers to the volumetric moisture content at which the species can no longer extract moisture from the soil. It is related to the soil texture class
^eIndicates the maximum rooting depth within the total soil profile. Estimated values