北京市7种经济林空气负离子特征研究

Air Negative Ions Characteristics of 7 Economic Forests in Beijing

为合理评估经济林提供空气负离子的价值量,于2015年5—10月对京市常见7种经济林开展林内空气负离子日变化监测,并对其物质量和价值量进行粗略评估。结果表明:7种经济林林内空气负离子浓度均在9:00—11:00和17:00左右出现高峰值,在15:00左右出现低谷值,各月平均浓度为746~2 056个/cm3;月变化整体表现为9月>8月>7月>6月>5月>10月,且各月差异极显著;7种经济林中提供负离子能力最强的为苹果,最弱的为枣树;负离子年物质量为2.09×1018~3.13×1018个/hm2,年价值量为7.84~18.17元/hm2。

Abstract：To reasonably evaluate the value of air negative ions that provided by economic forests, the diurnal variation of negative air ions in the forest was monitored from May to October in 2015, and the quality and quantity of the economic forests were evaluated. The results showed that the peak of negative air ions appeared at around 9：00-11：00 and 17：00, low value appeared at around 15：00 among 7 species, and the average daily concentration was between 746 ions/cm3 and 2056 ions/cm3. The monthly changes were as follows： September〉August〉July〉June〉May〉October, and the negative ions in each month were extremely different （P〈001）. The strongest ability to provide negative ions among all economic forests was Malus pumila, and the weakest was Ziziphus jujuba. The quality of economic forests was 209×10^18 ～313×10^18 ions/（hm-2·a-1）, the value was 784 ～1817 yuan hm2/a.