Soil Nitrogen Transformation Process Influenced by Litterfall Manipulation in Two Subtropical Forest Types
Wende Yan1,2,3,4, Taimoor Hassan Farooq1,5, Yi Chen1,3
1National Engineering Laboratory for Applied Technology of Forestry and Ecology in South China, Changsha, China.
Frontiers in Plant Science
|August 1, 2022
Summary
Litterfall addition boosts soil nitrogen in forests, while removal decreases it. Mixed forests show higher nutrient cycling than pure stands, impacting forest health and productivity.
Area of Science:
- Forest Ecology
- Soil Science
- Nutrient Cycling
Background:
- Nitrogen (N) is a critical limiting nutrient for global forest growth.
- Litterfall is a key pathway for nutrient return to forest soils, influencing N availability.
- Understanding N transformations under varying litterfall inputs is crucial for forest management.
Purpose of the Study:
- To investigate the impact of litterfall manipulation on soil nitrogen dynamics in Masson pine pure and mixed forests.
- To compare N transformation processes between pure and mixed forest types under different litterfall regimes.
Main Methods:
- Litterfall manipulation experiments: addition (LA), removal (LR), and control (LC).
- Analysis of soil ammonium (NH4+-N) and nitrate (NO3--N) content.
- Measurement of soil net ammonification, nitrification, and N mineralization rates.
Main Results:
- Litterfall addition increased soil total inorganic nitrogen (TIN) in both forest types.
- Litterfall removal decreased TIN, with greater reductions in mixed forests.
- LA significantly enhanced ammonification, nitrification, and mineralization; LR decreased these processes (except ammonification).
Conclusions:
- Litterfall input significantly alters soil nitrogen dynamics in subtropical forests.
- Mixed forests exhibit potentially higher nutrient returns and decomposition rates than pure forests.
- Forest management strategies should consider litterfall manipulation for optimizing soil N availability.
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