Decomposition and Nutrient Release from Larix olgensis Stumps and Coarse Roots in Northeast China 33-Year Chronosequence Study

Stumps and coarse roots form an important C pool nutrient in a Larix olgensis (Larix Henry) plantation ecosystem, their decomposition processes would affect cycling dynamics of the overall plantation. We studied release nutrients from stumps that were cleared 0, 6, 16, 26 33 years ago Northeast China. The divided into stump discs (SD), knots (SK), (>10 cm diameter) (CR1), medium-coarse (5–10 (CR2) fine-coarse (2–5 (CR3). During entire 33-year study period, SK, CR1, CR2 CR3 lost 87.37%, 96.24%, 75.76% 91.98% initial mass, respectively. average annual rate (k) was 0.068 for SD, 0.052 0.092 0.066 CR3. After decomposition, 5% its C, 2%, SK accumulated 1%, indicating slow release. N residues 186%, 109%, 158% 170%, Coarse released P significantly faster than SD with 13% CR1. cellulose, hemicellulose lignin roots. results show could contribute to soil fertility recovery serve as long-term reservoir forest vegetation.