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首页> 外文期刊>Canadian Journal of Forest Research >Impacts of enhanced nitrogen deposition and soil acidification on biomass production and nitrogen leaching in Chinese fir plantations.
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Impacts of enhanced nitrogen deposition and soil acidification on biomass production and nitrogen leaching in Chinese fir plantations.

机译：氮沉降和土壤酸化增强对杉木人工林生物量生产和氮淋失的影响。

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Atmospheric pollution levels in China are increasing quickly. Experience from other polluted regions shows that tree growth could be affected, but long-term effects of N deposition and soil acidification on Chinese forests remain mostly unknown. Soil acidification and N deposition were simulated for Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) plantations managed for three consecutive 20-year rotations in southeastern China. A factorial experiment combined four rain pH levels (2.5, 4.0, 5.6, and 7.0), four N deposition rates (1, 7.5, 15, and 30 kg N.ha-1.year-1), and two site qualities (poor and rich). Results indicate that atmospheric pollution effects are not immediate, but after one to two rotations, soil acidification effects could reduce ecosystem C pools significantly (-25% and -11% in poor and rich sites, respectively). N deposition rates above 15 kg N.ha-1.year-1 could offset some of the negative effects of soil acidification and lead to more ecosystem C (19 and 28 Mg C.ha-1 more in poor and rich sites, respectively, than in low N deposition). However, at high N deposition rates (>15 kg N.ha-1.year-1), N leaching losses could greatly increase, reaching 75 kg N.ha-1.year-1. Moderate N deposition could increase tree biomass production and soil organic mass, resulting in increased ecosystem C, but these gains could be associated with important N leaching. Atmospheric pollution could also result in the long term in nutrient imbalances and additional ecological issues (i.e., biodiversity loss, eutrophication, etc.) not studied here.Digital Object Identifier http://dx.doi.org/10.1139/x2012-004
机译：中国的大气污染水平正在迅速增加。其他受污染地区的经验表明，树木的生长可能会受到影响，但是氮沉降和土壤酸化对中国森林的长期影响仍然未知。对中国东南部连续20年轮作的杉木（Cunninghamia lanceolata （Lamb。）Hook。）人工林的土壤酸化和氮沉降进行了模拟。析因实验结合了四个降雨pH值（2.5、4.0、5.6和7.0），四个氮沉积速率（1、7.5、15和30 kg N.ha-1.year-1）和两个站点质量（较差）和富有）。结果表明，大气污染的影响不是即时的，但经过一到两次旋转后，土壤酸化作用可以显着减少生态系统的碳库（在贫穷和富裕地区分别减少-25％和-11％）。高于15 kg N.ha-1.year-1的氮沉积速率可以抵消土壤酸化的一些负面影响，并导致更多的生态系统碳（在贫穷和富裕地区分别增加19和28 Mg C.ha-1，比低氮沉积）。但是，在高氮沉积速率下（> 15 kg N.ha-1.year-1），N淋失损失可能会大大增加，达到75 kg N.ha-1.year-1。适度的氮沉降可以增加树木生物量的产量和土壤有机质，从而导致生态系统碳含量的增加，但是这些增加可能与重要的氮淋失有关。大气污染还可能导致长期的营养失衡和其他生态问题（即生物多样性丧失，富营养化等），此处未进行研究数字对象标识符http://dx.doi.org/10.1139/x2012-004

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