Summary of the article:

### Stress-Deciduous Phenology

The stress-deciduous phenology algorithm in the Community Land Model (CLM) was developed specifically to handle the phenology (seasonal growth patterns) of vegetation types that respond to both cold and drought stress signals, such as grasses and tropical drought-deciduous trees. 

Key points:

- The algorithm allows for multiple growing seasons per year, and the possibility that leaves may persist year-round in the absence of a suitable stress trigger. 

- In this case, the phenology switches to an evergreen habit, maintaining a marginally-deciduous leaf longevity (one year) until the occurrence of the next stress trigger.

- The algorithm is based in part on the grass phenology model proposed by White et al. (1997).

- It allows the CLM to simulate the phenology of vegetation types that can respond to both cold and drought-stress signals, and have flexible growth patterns throughout the year.