DOI: 10.1016/j.foreco.2016.08.040
Scopus记录号: 2-s2.0-84984706605
论文题名: Modeling repeated fertilizer response and one-time midrotation fertilizer response in loblolly pine plantations using FR in the 3-PG process model
作者: Subedi S. ; Fox T.R.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 380 起始页码: 90
结束页码: 99
语种: 英语
英文关键词: Assart effect
; Process based model
; Soil fertility
; Weibull function
Scopus关键词: Biomass
; Ecology
; Forecasting
; Forestry
; Nitrogen fertilizers
; Nutrients
; Soils
; Weibull distribution
; Assart effect
; Inverse relationship
; Loblolly pine plantations
; Nutrient availability
; Process-based modeling
; Soil fertility
; Temporal distribution
; Weibull functions
; Fertilizers
; aboveground biomass
; baseline survey
; coniferous tree
; fertilizer application
; growth response
; nutrient availability
; plantation
; site index
; soil fertility
; soil nutrient
; temporal distribution
; Weibull theory
; United States
; Pinus taeda
英文摘要: Productivity of loblolly pine in the southeastern US is frequently limited by soil nutrient availability. Therefore, fertilization is commonly used to increase nutrient availability and subsequent growth. This study used the soil fertility rating (FR) in the 3-PG model (Landsberg and Waring, 1997) to predict fertilizer growth response of loblolly pine stands. We used the growth response following fertilization in a regional study installed at 11 locations to determine how FR is affected by repeated fertilization with N and P starting at a young age. FR values in the stands that received no fertilization treatment, baseline FR, were determined using the previously developed relationship between site index and FR. Two locations that did not respond to biannual fertilization of N and P were considered non-nutrient deficient. The baseline FR values on the control plots at these sites averaged 0.9. We assumed that this was the maximum FR value for loblolly pine in the southern US in an environment where N and P are non-deficient. FR was then adjusted to this value in the fertilized plots at the other sites and used in 3-PG to predict growth. Using this adjusted FR value 92% of the variation in observed aboveground biomass in the fertilized plots was described by 3-PG simulated aboveground biomass. We then derived the relationship between response to repeated fertilization and baseline FR in the control plots. An inverse relationship was observed between baseline FR and fertilizer response. Baseline FR described 56% of the variation in the fertilizer response. We also developed a dynamic function to model the FR to accurately predict growth in loblolly pine stands fertilized one time with N and P during the middle of the rotation. We used data from a series of midrotation loblolly pine plantations across the southeastern United States to model change in FR (ΔFR). This was done using an optimization process where the temporal distribution of the ΔFR was modeled using the Weibull function. Baseline FR, intensity of N fertilization, and year since treatment were used as input regressors to model dynamics of FR following midrotation fertilization. The model accurately described temporal changes in FR that enabled 3-PG to accurately predict response to midrotation fertilization with N and P. When FR values generated using this function were input into the 3-PG model, 80% of the variation in the observed aboveground biomass in fertilized loblolly pine plantations was described by the 3-PG simulated aboveground biomass. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64714
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, VA, United States
Recommended Citation:
Subedi S.,Fox T.R.. Modeling repeated fertilizer response and one-time midrotation fertilizer response in loblolly pine plantations using FR in the 3-PG process model[J]. Forest Ecology and Management,2016-01-01,380