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生物碳系列性质之七:固碳

发布时间:06-08 23:07 来源: 作者: 阅读:3423 网友评论0

介绍其固碳性及对气候的影响

          For example, a farm on a fertile floodplain, with good water availability, may produce biochar from feedstocks on the farm with good water and nutrient retention properties. If this is applied to soils on the same farm, it may allow a reduction of a single fertiliser pass. However, if the biochar is sold (or traded) to the farm next door, which may be on soils with low water and nutrient retention, then there may be a reduction of two fertiliser passes and a substantial reduction in irrigation, for example. It is possible, therefore, that the CO2 equivalents saved on the farm next door are more than the CO2 equivalent emissions produced during transport from one farm to the other.

           Adding biochar to soil is not an alternative to reducing the emissions of greenhouse gasses. Minimising future climate change requires immediate action to lower greenhouse gas emissions and harness alternative forms of energy.From a climate change mitigation perspective, biochar needs to be considered in parallel with other mitigation strategies and cannot be seen as an alternative to reducing emissions of greenhouse gases.

         Biochar can function as a carbon sink in soils under certain conditions. However, the reported long residence times of biochar have not been confirmed for today’s intensive agricultural systems in temperate regions. Disintegration of biochar is likely to be stimulated by intensive agricultural practices (tilling, plouging, harrowing) and use of heavy machinery, thereby potentially reducing residence times.

        As far as the current scientific evidence allows us to conclude, biochar is not a ‘silver bullet’ or panacea for the whole host of issues ranging from food production and soil fertility to mitigating  global warming and climate change for which it is often posited. The critical knowledge gaps are manifold, mainly because the charcoal-rich historic soils, as well as most experimental sites, have been studied mostly in tropical environments, added to the large range of biochar properties that can be produced from the feedstocks currently available subjected to different pyrolysis conditions. Biochar analogues, such as pyrogenic BC, are found in varying, and sometimes substantial amounts in soils all over the world. As well as causing some difficulty with predicting possible impacts of biochar addition to soil, the large variety in biochar properties that can be produced actually provides an opportunity to ‘engineer’ biochar for specific soil-environment-climate-management conditions, thereby potentially increasing soil functioning and decreasing threats to soil and adapting to climate change.

          While it is possible that the inclusion of biochar into the soil system may aid the reduction of atmospheric CO2, it is also feasible that more CO2 will be required to be produced as a by-product of processes undertaken to remediate the damage done by crop residue removal, such as increased production of fertiliser which may need to be undertaken to keep yields stable.
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