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首页> 外文期刊>Plant and Soil >Studies on litter characterization using p#pdC NMR and assessment of microbial activity in natural forest and plantation crops' (teak and rubber) soil ecosystems of Kerala, India
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Studies on litter characterization using p#pdC NMR and assessment of microbial activity in natural forest and plantation crops' (teak and rubber) soil ecosystems of Kerala, India

机译：使用p＃pdC NMR对凋落物进行表征研究，并评估印度喀拉拉邦天然林和人工林（柚木和橡胶）土壤生态系统中的微生物活性

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The leaf litter is the major source of soil organic matter in natural and many plantation crop ecosystems. Quantity and quality of organic matter in a soil ecosystem is of utmost importance in regulating the soil health. Hence assessment of quality of organic matter input, viz., litter is important and is attempted in this study. The leaf litter of rubber (Hevea brasiliensis), pueraria (Pueraria phaseoloides), mucuna (Mucuna bracteata), teak (Tectona grandis) and forest (mixed species) were analyzed using solid state p#pdC nuclear magnetic resonance (NMR) to study the relative abundance of different carbon compounds present. The spectra revealed that litter of all species studied contain relatively larger amounts of polysaccharides compared to other C containing compounds. Also it could be observed that the alkyl-C to O-alkyl-C ratio of rubber litter was much higher compared to that of others. Aromatics and carbonyl compounds were also present in all litter species. The resource quality based on alkyl-C to O-alkyl-C ratio of the litter samples studied can be arranged in the order pueraria > teak > mucuna > forest > rubber. The respiration rate, substrate induced respiration rate and biomass-C (Cmic) of the litter samples were estimated. It could be observed that litter associated microbial activity decreased as alkyl-C to O-alkyl-C ratio increased. Resource quality derived from the NMR spectra and the litter biological properties were complementary. Soil samples (0-15 cm) from the five soil ecosystems (rubber, pueraria, mucuna, teak and forest) were analyzed for respiration rate, substrate induced respiration rate, Cmic, total-C and total-N. The forest soil had higher respiration rate, total-C and total-N compared to cultivated soil systems. Pueraria, mucuna and teak soils were comparable for their biological properties while rubber soil recorded comparatively lower microbial activity.
机译：凋落物是自然和许多人工林生态系统中土壤有机质的主要来源。土壤生态系统中有机物的数量和质量对于调节土壤健康至关重要。因此，对有机物输入质量（即垫料）的质量评估很重要，并且在本研究中已尝试进行。使用固态p＃pdC核磁共振（NMR）分析了橡胶（Hevea brasiliensis），葛根（Pueraria phaseoloides），粘菌（Mucuna bracteata），柚木（Tectona grandis）和森林（混合物种）的落叶。存在不同碳化合物的相对丰度。光谱显示，与其他含碳化合物相比，所有研究的凋落物都含有相对大量的多糖。还可以观察到，橡胶垫料的烷基-C与O-烷基-C之比比其他橡胶要高得多。芳香和羰基化合物也存在于所有垃圾种类中。所研究的凋落物样品的基于烷基-C与O-烷基-C之比的资源质量可以以葛根>柚木>粘胶>森林>橡胶的顺序排列。估算了垫料样品的呼吸速率，底物诱导的呼吸速率和生物量碳（Cmic）。可以观察到，随烷基-C与O-烷基-C之比的增加，凋落物相关的微生物活性降低。从NMR光谱和垫料生物学特性得出的资源质量是互补的。分析了五个土壤生态系统（橡胶，葛根，粘菌，柚木和森林）的土壤样品（0-15厘米）的呼吸速率，基质诱导的呼吸速率，Cmic，总碳和总氮。与耕作土壤系统相比，森林土壤具有更高的呼吸速率，总碳和总氮。葛根，粘液和柚木土壤的生物学特性相当，而橡胶土壤的微生物活性较低。

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