tg: Run metamodel

In lucabutikofer/LingraNR: R Interface to LINGRA-N Tool

Run metamodel

Description

These functions run the metamodel described in Qi et al. 2018 for grassland productivity on temporary (tg()), permanent (pg()) and semi-natural (rough grazing, rg()) grassland.

Usage

tg(awc, pmam, pjj, pas, rmam, ras, tmam, tjj, tas)

pg(awc, pamj, pjas, ramj, rjas, tmam, tjas)

rg(awc, pamj, pjas, ramj, rjas, tmam, tjas)

Arguments

awc	Numeric. Available water content
pmam	Cumulative precipitation for the period March-April-May
pjj	Cumulative precipitation for the period June-July
pas	Cumulative precipitation for the period August-September
rmam	Cumulative global radiation for the period March-April-May
ras	Cumulative global radiation for the period August-September
tmam	Mean air temperature for the period March-April-June
tjj	Mean air temperature for the period June-July
tas	Mean air temperature for the period August-September
pamj	Cumulative precipitation for the period April-May-June
pjas	Cumulative precipitation for the period July-August-September
ramj	Cumulative global radiation for the period April-May-June
rjas	Cumulative global radiation for the period July-August-September
tjas	Mean air temperature for the period June-August-September

Details

"Temporary grasslands are the most productive, often consisting of frequently resown perennial ryegrasses (Lolium perenne) and are assumed to receive annual N application rate of 300 kg N ha−1. Permanent grasslands consist of a mixture of sown and indigenous grasses and legumes; they are of intermediate productivity and are assumed to receive annual N applications of 150 kg N ha−1. The extensively used rough grazing are diverse semi-natural grasslands containing various herbaceous species, receive no synthetic N and are areas of low productivity." (Qi et al. 2018)

Value

Numeric value of dry matter production in t/ha.

Examples

# Yield of temporary grassland:
tgy <- tg(awc = 37.9,
          pmam = 105,
          pjj = 126.9,
          pas = 95.2,
          rmam = 1247.7,
          ras = 786.8,
          tmam = 9.8,
          tjj = 15.8,
          tas = 15.6)

lucabutikofer/LingraNR documentation built on April 7, 2023, 7:20 a.m.