chillR (0.66)

0 users

Statistical Methods for Phenology Analysis in Temperate Fruit Trees.

http://cran.r-project.org/web/packages/chillR

The phenology of plants (i.e. the timing of their annual life phases) depends on climatic cues. For temperate trees and many other plants, spring phases, such as leaf emergence and flowering, have been found to result from the effects of both cool (chilling) conditions and heat. Fruit tree scientists (pomologists) have developed some metrics to quantify chilling and heat. 'chillR' contains functions for processing temperature records into chilling (Chilling Hours, Utah Chill Units and Chill Portions) and heat units (Growing Degree Hours). Regarding chilling metrics, Chill Portions are often considered the most promising, but they are difficult to calculate. This package makes it easy. 'chillR' also contains procedures for conducting a PLS analysis relating phenological dates (e.g. bloom dates) to either mean temperatures or mean chill and heat accumulation rates, based on long-term weather and phenology records. As of version 0.65, it also includes functions for generating weather scenarios with a weather generator, for conducting climate change analyses for temperature-based climatic metrics and for plotting results from such analyses.

Maintainer: Eike Luedeling
Author(s): Eike Luedeling

License: GPL-3

Uses: fields, httr, Kendall, pls, raster, readxl, RMAWGEN, sp, XML
Reverse suggests: decisionSupport

Released 7 months ago.


5 previous versions

Ratings

Overall:

  (0 votes)

Documentation:

  (0 votes)

Log in to vote.

Reviews

No one has written a review of chillR yet. Want to be the first? Write one now.


Related packages:(20 best matches, based on common tags.)


Search for chillR on google, google scholar, r-help, r-devel.

Visit chillR on R Graphical Manual.