Gorissen A, Joosten N N, Jansen A E
DLO-Institute for Soil Fertility Research, P.O. Box 48, 6700 AA Wageningen, The Netherlands.
Wageningen Agricultural University, Department of Phytopathology, P.O. Box 8025, 6700 EE Wageningen, The Netherlands.
New Phytol. 1991 Oct;119(2):243-250. doi: 10.1111/j.1469-8137.1991.tb01027.x.
In this study the impact of two components of air pollution, i.e., ozone and ammonium sulphate, on carbon transport to mycorrhizal roots of Douglas fir was investigated. Juvenile Douglas fir (Pseudulsuga menziesii [Mirb.] Franco) were inoculated with Rhizopogon vinicolor A. H. Smith and Lactarius rufus (Scop.: Fr.) Fr., and allowed to grow outdoors for a period of four months. Subsequently, they were transferred to a phytotron and treated with 0 or 200μg m ozone for 28 days. During these treatments, they were watered with a solution of ammonium sulphate of concentrations corresponding to 5, SO and 200 kg N ha yr , During the last three days, the trees were pulse-labelled with 14CO . Ozone increased the amounts of C recovered in the new needle fraction, whereas the amounts recovered in the roots and root/soil respiration tended to decrease. Mycorrhizal frequency tended to increase during ozone treatment. Ammonium sulphate did not affect the distribution pattern of C over the trees, but seemed to stimulate the activity of the root system and mycorrhizal frequency at the intermediate nitrogen level.
在本研究中，调查了空气污染的两个组成部分，即臭氧和硫酸铵，对花旗松菌根根际碳转运的影响。将花旗松幼苗（Pseudulsuga menziesii [Mirb.] Franco）接种上酒红须腹菌（Rhizopogon vinicolor A. H. Smith）和红褐乳菇（Lactarius rufus (Scop.: Fr.) Fr.），并使其在户外生长四个月。随后，将它们转移到人工气候箱中，用0或200μg m的臭氧处理28天。在这些处理期间，用浓度分别相当于5、50和200 kg N ha yr的硫酸铵溶液浇灌它们。在最后三天，用¹⁴CO对树木进行脉冲标记。臭氧增加了新针叶部分中回收的碳量，而在根以及根/土壤呼吸中回收的量则趋于减少。在臭氧处理期间，菌根频率趋于增加。硫酸铵不影响碳在树木上的分布模式，但似乎在中等氮水平下刺激了根系活性和菌根频率。
