Effects of species richness and functional groups on chemical constituents relevant for methane yields from anaerobic digestion: results from a grassland diversity experiment
Effects of species richness and functional groups on chemical constituents relevant for methane yields from anaerobic digestion: results from a grassland diversity experiment
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物种丰富度和官能团对厌氧消化甲烷产量相关化学成分的影响：草原多样性实验的结果
DOI：
10.1111/gfs.12028
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发表时间：
2012
影响因子：
2.4
通讯作者：
Wachendorf M.
中科院分区：
文献类型：
--
作者：
Khalsa J;Fricke T;Weigelt A;Wachendorf M.
畜牧业生产系统的变化导致土地使用的变化和废弃，特别是农业欠发达地区的半天然草地。从广泛的，高多样性的草地生物质中产生能源可以替代它们的废弃物，厌氧消化是将草地生物质转化为能源的一种可能方法。然而，知之甚少的物种丰富度（SR）和功能基团的化学成分相关的厌氧消化和由此产生的能源潜力的影响。在这项研究中，研究了与牧草质量相关的牧草化学成分的变化，沿着一个明确的多样性梯度（1至60个物种）和不同的功能组组合（豆科植物，小型草本植物，高大草本植物和禾本科植物）。通过粗纤维（CF）、粗蛋白（CP）、粗脂肪、无氮提取物等饲料质量参数的浓度及其记录的消化率值以及相应的甲烷产量来估计基质特异性甲烷产量（CH4 sub）。结果表明，随着SR的增加，CF增加和CP下降，即使这些影响不能完全摆脱存在的草。这些趋势导致SR对CH4 sub的负面影响，而面积比甲烷产量（CH4面积= CH4 sub×生物量产量）由于生物量随SR增加而大幅增加而增加。通常，CH4亚基和CH4在官能团单一培养物和所有官能团混合物之间变化。
Changes in livestock production systems have led to land‐use changes and abandonment, especially of semi‐natural grassland in agriculturally less favoured regions. The generation of energy from biomass of extensive, high‐diversity grasslands can be an alternative to their abandonment, and anaerobic digestion is one possible method for converting grassland biomass into energy. However, little is known about the effects of species richness (SR) and functional groups on chemical constituents relevant for anaerobic digestion and the resulting energy potential. In this study, changes in the herbage chemical constituents that are relevant for forage quality were studied along a well‐defined diversity gradient (one to sixty species) and across different combinations of functional groups (legumes, small herbs, tall herbs and grasses). Substrate‐specific methane yield (CH4 sub) was estimated through the concentrations of forage‐quality parameters such as crude fibre (CF), crude protein (CP), crude lipid, nitrogen‐free extract and their documented digestibility values, as well as the respective methane yields. Results show that with increasing SR, the CF increased and CP decreased, even though these effects could not be fully disentangled from the presence of grasses. These trends led to a negative effect of SR on CH4 sub, while the area‐specific methane yield (CH4 area= CH4 sub× biomass yield) increased due to a strong increase in biomass with increasing SR. The CH4 subwas increased when legumes were present, and it declined with the presence of grasses. Generally, CH4 suband CH4 areavaried between functional‐group monocultures and all functional‐group mixtures.
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DOI：
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