A modified ingrowth core method for measuring fine root production, mortality and decomposition in forests.

Area of Science:

• Forest Ecology
• Soil Science
• Plant Physiology

Background:

• The ingrowth core method is standard for fine root production assessment but has limitations.
• Existing methods often fail to accurately capture concurrent root dynamics like mortality and decomposition.
• Accurate fine root estimation is crucial for understanding forest ecosystem function and carbon cycling.

Purpose of the Study:

• To modify the ingrowth core method for improved fine root production, mortality, and decomposition quantification.
• To develop new models for estimating concurrent fine root dynamics.
• To apply and validate the modified method in a Mongolian oak (Quercus mongolica) forest.

Main Methods:

• Utilized mini ingrowth cores (1.2 cm diameter) with extended sampling intervals (growing season).
• Developed novel models to simultaneously estimate fine root production, mortality, and decomposition.
• Applied the refined methodology to a secondary Mongolian oak forest ecosystem.

Main Results:

• Annual fine root production, mortality, and decomposition were estimated at 2.10 ± 0.23, 1.78 ± 0.20, and 0.85 ± 0.13 t ha⁻¹, respectively.
• Approximately 33.3% of fine root production decomposed within the growing season.
• The modified method yielded significantly different production estimates compared to various long-term, short-term, and inflow methods, highlighting its distinct performance.

Conclusions:

• The modified mini ingrowth core method offers a more accurate and less disruptive approach to estimating fine root dynamics.
• This improved method overcomes limitations of traditional ingrowth core techniques, enhancing quantification of root decomposition.
• The refined methodology provides a valuable alternative for ecological studies requiring precise fine root production, mortality, and decomposition data.