Summary:

## Carbon and Nitrogen Allocation in CLM5

### Introduction

The carbon and nitrogen allocation routines in the Community Land Model (CLM) determine how newly assimilated carbon from photosynthesis and available mineral nitrogen from plant uptake are distributed within the plant. A significant change in CLM5, compared to prior versions, is that the allocation of carbon and nitrogen now occurs independently rather than sequentially.

### Key Points

- The carbon and nitrogen allocation processes in CLM determine the fate of newly acquired carbon and nitrogen resources within the plant.
- In CLM5, the allocation of carbon and nitrogen is performed independently, rather than following a sequential approach as in previous versions of the model.
- This change represents a significant modification to the way carbon and nitrogen allocation is handled in the latest version of the Community Land Model.

The summary captures the main points of the introduction, highlighting the key change in the carbon and nitrogen allocation routines in CLM5 compared to previous versions of the model. It conveys the essential information from the provided text without including any external details.