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Irrigation, fertilization and initial substrate quality effects on decomposing Loblolly pine litter chemistry

机译：灌溉，施肥和初始基质质量对分解火炬松垃圾的影响

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Changes in carbon chemistry (i.e., carbon compound classes such as aromatics, phenolics, etc.) of loblolly pine (Pinus taeda L.) litter were examined during three years of decomposition under factorial combinations of irrigation and fertilization treatments. Cross polarization magic angle spinning 13C nuclear magnetic resonance revealed that total carbon and nutrient concentrations correlated strongly with carbohydrate and O-alkyl carbon concentrations but did not relate well with concentrations of lignin, aromatic and phenolic carbon, or with lignin-related decomposition indices. The best correlations to carbon and nutrient concentrations occurred with the C/N (R 2=0.86, P > 0.0001) and alkyl/O-alkyl (R 2=0.75, P > 0.0001) decomposition indices. In all situations, the carbon chemistry of the decomposing litter followed the general pattern of accumulation of alkyl and carbonyl carbon with a loss of O-alkyl and methoxy carbon. Only small variations in the aromatic and phenolic carbon concentrations were detected. Since lignin is composed primarily of aromatic and phenolic carbons, the observation that there were only small changes in the aromatic and phenolic carbons of the litter is consistent with the general stability of lignin in these ecosystems. Trends in carbon chemistry during decomposition suggested that fertilization accelerated the decomposition process by about 100% as compared with the control plots. Irrigation also accelerated the decomposition process but to a lower extent (about 62% greater than control plots). Initial litter quality, as defined by the litter C/N, did not have a significant effect on the carbon chemistry of the decomposing litter. This study demonstrated that the decomposition mechanisms were not altered by the treatments but there were important changes in the relative chemistry of the decomposing litter which impacted the rate of decomposition.
机译：在灌溉和施肥处理的分解结合下分解的三年中，研究了火炬松（Pinus taeda L.）凋落物的碳化学变化（即，碳化合物类别，如芳香族化合物，酚类等）。交叉极化魔角旋转13 C核磁共振表明，总碳和营养素浓度与碳水化合物和O-烷基碳浓度密切相关，但与木质素，芳香族和酚碳或木质素相关分解指数。与碳和养分浓度的最佳相关性与C / N（R 2 = 0.86，P> 0.0001）和烷基/ O-烷基（R 2 = 0.75，P> 0.0001）的分解指数有关。 。在所有情况下，分解垃圾的碳化学性质都遵循烷基和羰基碳积累的一般模式，而O-烷基和甲氧基碳则流失。仅检测到芳香族和酚类碳浓度的微小变化。由于木质素主要由芳香族和酚类碳组成，因此观察到凋落物的芳香族和酚类碳只有很小的变化，这与木质素在这些生态系统中的总体稳定性是一致的。分解过程中碳化学的趋势表明，与对照区相比，施肥使分解过程加快了约100％。灌溉也加速了分解过程，但程度较低（比对照样地大约62％）。初始垃圾质量（由垃圾C / N定义）对分解垃圾的碳化学没有显着影响。这项研究表明，分解处理不会改变分解机理，但是分解垃圾的相对化学性质发生了重要变化，从而影响了分解速度。

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