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Little bluestem litter dynamics in Minnesota old fields.

J Pastor^1,2, M A Stillwell³, D Tilman²

¹Natural Resources Research Institute, 55812, Duluth, MN, USA.

|March 18, 2017

Summary

This summary is machine-generated.

Litter quality drives initial decay and nitrogen loss in little bluestem (Schizachyrium scoparium). Fertilizer addition, however, influences later nitrogen immobilization, showing independent effects on plant litter dynamics.

Keywords:

Decomposition Fertilization Nitrogen Schizachyrium scoparium

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Area of Science:

Ecology
Plant Biology
Soil Science

Background:

Little bluestem (Schizachyrium scoparium) is a dominant prairie grass.
Understanding plant litter decomposition and nutrient cycling is crucial for ecosystem health.
Nitrogen dynamics in soil are influenced by litter quality and external nitrogen inputs.

Purpose of the Study:

To investigate the decay rates and nitrogen dynamics of little bluestem litter.
To determine the influence of litter quality versus fertilizer addition on decomposition and nitrogen cycling.
To differentiate the effects of initial litter nitrogen content and exogenous nitrogen supply.

Main Methods:

Litterbag technique used to study Schizachyrium scoparium litter.
Experiments conducted in fertilized and unfertilized Minnesota old fields.
Analysis of annual decay rates, nitrogen leaching, and nitrogen immobilization over 18 months.

Main Results:

Initial decay rates and early nitrogen leaching were correlated with litter's inherent nitrogen content.
Fertilizer additions, not initial litter nitrogen, correlated with nitrogen immobilization after the first month.
Nitrogen immobilization occurred for at least 18 months post-decomposition initiation.

Conclusions:

Litter quality and exogenous nitrogen supply exert independent influences on little bluestem litter decomposition.
Early-stage decomposition is primarily governed by litter quality.
Later-stage nitrogen dynamics are more sensitive to external nitrogen availability from fertilization.