Soil acidification stimulates the emission of ethylene from temperate forest soils
Soil acidification stimulates the emission of ethylene from temperate forest soils
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DOI：
10.1007/s00376-009-8120-9
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发表时间：
2009-11
影响因子：
5.8
通讯作者：
Xingkai Xu;I. Kazuyuki
中科院分区：
文献类型：
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作者：
Xingkai Xu;I. Kazuyuki
酸雨引起的土壤酸化对森林生态系统具有不利影响，这与土壤中乙烯释放的作用有关。然而，酸化对森林土壤中乙烯循环的影响尚未在全球变化研究中得到充分考虑。对4种温带森林表层土壤（0-5 cm）进行了采样，研究了pH变化对土壤中乙烯和CO2排放以及溶解有机碳（DOC）释放的影响。在缺氧和好氧条件下，森林土壤酸化或碱化程度的增加会增加DOC释放到土壤中的浓度。当土壤酸化至pH<4.0时，土壤乙烯释放量随pH的降低而显著增加，且随DOC释放量的增加而增加，这与土壤CO2释放量不同。因此，短期刺激响应乙烯排放的pH值下降，在这样的森林土壤中的DOC浓度的增加，由于酸化，而不是碳矿化。这一结果对研究土壤酸化对不同林分特别是重度酸沉降退化林分乙烯循环的影响具有重要意义。
Soil acidification via acid precipitation is recognized to have detrimental impacts on forest ecosystems, which is in part associated with the function of ethylene released from the soil. However, the impacts of acidification on the cycling of ethylene in forest soils have not been fully taken into consideration in global change studies. Forest topsoils (0–5 cm) under four temperate forest stands were sampled to study the effects of a pH change on the emissions of ethylene and carbon dioxide from the soils and concentrations of dissolved organic carbon (DOC) released into the soils. Increasing acidification or alkalinization of forest soils could increase concentrations of DOC released into the soils under anoxic and oxic conditions. The ethylene emission from these forest topsoils could significantly increase with a decreasing pH, when the soils were acidified experimentally to a pH<4.0, and it increased with an increasing concentration of DOC released into the soils, which was different from the carbon dioxide emission from the soils. Hence, the short-term stimulating responses of ethylene emission to a decreasing pH in such forest soils resulted from the increase in the DOC concentration due to acidification rather than carbon mineralization. The results would promote one to study the effects of soil acidification on the cycling of ethylene under different forest stands, particularly under degraded forest stands with heavy acid depositions.