The Influence of Silviculture Treatments on the Leaf Litter Decomposition Rate of Triploid <i>Populus tomentoza</i>

Abstract

Leaf litter decomposition is a fundamental mechanism for self-fertilization in forest ecosystems. Decomposition rate is an important factor in this process. Understanding how silvicultural treatments affect leaf litter decomposition rate can aid in plantation management. In order to reveal the effects of silvicultural treatments on litter decomposition in triploid Populus tomentoza pulp plantations, a litterbag technique was employed in a range of experimental conditions: with/without tree canopy cover (inter or intra forest belts), intercropping, and embedment in the soil. The results showed treatments had varying affects on leaf litter decomposition. The micro-environment created by the forest belt had no significant impact on leaf litter decomposition. The rate of decomposition of embedded leaf litter was significantly higher than litter on the soil surface, indicating that litter buried by tillage or hoeing would promote faster decomposition. Leaf litter decomposition was also enhanced by mixing with cotton (Gossypium sp.) leaf, showing that intercropping sped up the nutrient cycle in triploid P. tomentoza pulp plantations, thereby maintaining and improving soil productivity.