| tsi {lehuynh} | R Documentation |
Calculate TSI (Trophic state index)
Description
Calculate TSI. TSI range: 0 - 100.
Usage
tsi(x, type = c("chla", "TP", "TN", "SD"))
Arguments
x |
numeric object |
type |
type of variable used to calculate TSI. See Details for more information. |
Details
Trophic state classification (Carlson, 1996)
<30-40, Oligotrophy
40-50, mesotrophy
50-70, eutrophy
70-100, hypereutrophy
Type of variable used to calculate TSI:
SD: Secchi depth, meter
chla: chlorophyll, ug/L or mg/m3
TP: total Phosphorus, ug/L or mg/m3
TN: total Nitrogen, mg/L
Carlson (1977): TSI-SD, TSI-Chla, TSI-TP
USEPA (2000): TSI-TN
Value
a numeric value.
References
Carlson, R. E. (1977). A trophic state index for lakes. Limnology and Oceanography, 22(2), 361-369.
Carlson, R. E., & Simpson, J. (1996). A Coordinator's Guide to Volunteer Lake Monitoring Methods. North American Lake Management Society, 73-92.
USEPA. (2000). Nutrient Criteria Technical Guidance Manual: Lakes and Reservoirs, 42-44.
Examples
chla <- c(0.12, 0.34, 0.94, 6.4)
tsi(chla, type = "chla")
tsi(chla, type = "TP")