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首页> 外文期刊>Plant and Soil >Quality and decomposition in soil of rhizome, root and senescent leaf from Miscanthus x giganteus, as affected by harvest date and N fertilization
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Quality and decomposition in soil of rhizome, root and senescent leaf from Miscanthus x giganteus, as affected by harvest date and N fertilization

机译：受收获日期和施氮量影响的芒草（Miscanthus x giganteus）根茎，根和衰老叶片的质量和分解

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摘要

To predict the environmental benefits of energy crop production and use, the nature and fate of biomass residues in the soil need to be quantified. Our objective was to quantify Miscanthus x giganteus biomass recycling to soil and to assess how harvesting time and N fertilization affect their characteristics and subsequent biodegradability. The quantification of aerial and belowground biomass and their sampling were performed on 2- and 3-year-old Miscanthus stands, either fertilized with 120 kg N hap# yearp# or not fertilized, in autumn (maximal biomass production) and winter (maturity). Plant biomass was chemically characterized (total sugars, Klason lignin, C/N) and incubated in optimum decomposition conditions (15pC, 80 kPa) for 263 days, for C and N mineralization. Accumulation of carbon in rhizomes and roots was 7.5 to 10 t C hap# and represented about 50% of total plant biomass C. Senescent leaves represented about 1.5 t C hap# yearp#. All residues, especially the roots, had high lignin contents, while the rhizomes also had a high soluble content due to their nutrient storage function. The C mineralization rates were closely related to the chemical characteristics of the residue, higher sugar and lower lignin contents leading to faster decomposition, as observed for rhizomes.
机译：为了预测能源作物生产和使用的环境效益，需要对土壤中生物质残留物的性质和去向进行量化。我们的目标是量化芒草（Miscanthus x giganteus）生物质向土壤的循环利用，并评估收获时间和氮肥如何影响其特性和随后的生物降解性。在2岁和3岁的芒草林中对空中和地下生物量进行定量分析，并在秋季（最大的生物量产量）和冬季（成熟度）施以120 kg N hap＃年p＃施肥或不施肥。 。对植物生物质进行化学表征（总糖，克拉森木质素，C / N），并在最佳分解条件（15pC，80kPa）下孵育263天，以进行C和N矿化。根茎和根中的碳累积量为7.5至10 t C hap＃，约占植物生物量C的50％。衰老的叶片约1.5 t C hap＃年。所有残留物，尤其是根，都具有较高的木质素含量，而根茎由于其营养储存功能，也具有较高的可溶性含量。 C矿化速率与残留物的化学特性，糖含量较高和木质素含量较低（导致根茎降解更快）密切相关。

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