CAJ | 학술논문

采用网袋法研究三倍体毛白杨落叶、小枝(直径小于0.5 cm)、细根(直径小于2mm)和皮的分解速率以及 N，P动态。结果表明：4种有机残体在357天中分解速率存在显著性差异，到试验结束时(2008年11月)细根的分解率最大(42.5%)，其次是落叶(30.5%)和皮(26.0%)，小枝的分解率最低(20.9%)； Olson指数方程对4种有机残体的分解拟合效果较好，相关系数 R2为0.96～0.98，由此计算得到4种有机残体的年分解率分别为42.88%，31.74%，26.25%和20.54%；不同有机残体分解初期存在 N，P元素富集现象，但富集程度与富集持续的时间存在差异，细根、叶、皮、小枝中 N 的富集度分别为11.6%，127.2%，122.6%和126.7%，P 的富集度分别为105.9%，172.9%，123.0%和163.9%，因此N，P的富集度均以叶最高，以细根最低；从富集持续的时间来看，细根、叶、皮、小枝中的 N富集持续时间分别为205，239，297和265天，以皮持续的时间最长，P 富集持续的时间分别是205，205，265和239天，以小枝持续的时间最长；从不同有机残体释放的N，P量来看，细根释放量最多，其次是叶，皮和小枝释放量较少。三倍体毛白杨纸浆林中不同有机残体在养分归还上存在不同特点，尤其是皮和小枝分解率低，养分富集持续时间长，今后应采取针对性措施加快其分解，以不断提高林地生产力。
채용망대법연구삼배체모백양락협、소지(직경소우0.5 cm)、세근(직경소우2mm)화피적분해속솔이급 N，P동태。결과표명：4충유궤잔체재357천중분해속솔존재현저성차이，도시험결속시(2008년11월)세근적분해솔최대(42.5%)，기차시락협(30.5%)화피(26.0%)，소지적분해솔최저(20.9%)； Olson지수방정대4충유궤잔체적분해의합효과교호，상관계수 R2위0.96～0.98，유차계산득도4충유궤잔체적년분해솔분별위42.88%，31.74%，26.25%화20.54%；불동유궤잔체분해초기존재 N，P원소부집현상，단부집정도여부집지속적시간존재차이，세근、협、피、소지중 N 적부집도분별위11.6%，127.2%，122.6%화126.7%，P 적부집도분별위105.9%，172.9%，123.0%화163.9%，인차N，P적부집도균이협최고，이세근최저；종부집지속적시간래간，세근、협、피、소지중적 N부집지속시간분별위205，239，297화265천，이피지속적시간최장，P 부집지속적시간분별시205，205，265화239천，이소지지속적시간최장；종불동유궤잔체석방적N，P량래간，세근석방량최다，기차시협，피화소지석방량교소。삼배체모백양지장림중불동유궤잔체재양분귀환상존재불동특점，우기시피화소지분해솔저，양분부집지속시간장，금후응채취침대성조시가쾌기분해，이불단제고임지생산력。
In order to understand the decomposition rate and nutrient dynamic of different organic residues of triploid Populus tomentoza,and to find out feasible ways for maintaining and improving long - term soil productivity,litterbag method was used to investigate the decomposition rate and macro nutrients( N,P) release of leaf litter,fine branch litter (≤5 mm) ,fine root litter(≤2 mm) and bark litter for 357 days. By the end of experiment,decomposition rates of fine root litter,leaf litter,bark litter and fine branch litter were 42. 5%,30. 5%,26. 0%,and 20. 9%,respectively and were significantly different (P <0. 001) among different organic residues. The decomposition process of the 4 residues fitted well to Olson equation,with values of correlation efficient square ranging from 0. 96 and 0. 98. According to Olson equation,annual decomposition rates of different residues were significantly different,from 42. 88% for fine root litter, 31. 74% for leaf litter,26. 25% for bark litter,to 20. 54% for fine branch litter. Enrichment of N,P in remains was observed in the 4 residues,but the duration and amplitude of enrichment were different for different residues. Enrichment amplitude of N was 11 . 6%,127 . 2%,122 . 6%,126 . 7% and of P was 105 . 9%,172 . 9%,123 . 0%,163 . 9%, respectively for fine root litter,leaf litter,bark litter and fine branch litter. The duration of N enrichment was 205d, 239d,297d,265d,respectively for fine root litter,leaf litter,bark litter and fine branch litter. The duration of N enrichment for bark litter was the longest. The duration of P enrichment was 205d,205d,265d and 239d,respectively for fine root litter,leaf litter,bark litter and fine branch litter. The duration of P enrichment for fine branch litter was the longest. The maximum of N,P release was from fine root litter,secondly from leaf litter,the minimum from bark litter and fine branch litter. These results indicated that different residues had different characters in nutrient release and needed to employ proper measures to promote decomposition and nutrient release,especially for bark litter and fine branch litter due to their lower decomposition rate and longer nutrient enrichment.