Xu Yu, Xiao Hua-Yun, Zheng Neng-Jian, Zhang Zhong-Yi, Qu Ling-Lu, Zhao Jing-Jing
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Huan Jing Ke Xue. 2016 Jun 8;37(6):2376-2382. doi: 10.13227/j.hjkx.2016.06.048.
N and S contents in leaves, Lamb. leaves, epilithic (Hedw.) Broth. and rhizosphere soil collected along 3 directions from urban area to rural area at Guiyang city in a total of 296 samples were investigated systematically. The level of atmospheric N deposition and atmospheric SO concentrations at each sampling site were calculated according to the quantitative relationship between moss N content and atmospheric N deposition and the quantitative relationship between moss S content and atmospheric SO concentration. Leaves N content in (1.01%-2.37%) and Lamb.(0.99%-2.42%)showed significant decrease from urban area with the highest atmospheric nitrogen deposition to suburb, while slightly higher leaves N reemerged at rural area beyond 24 km, suggesting increased N deposition occurred in rural area. Leaves S content in (0.16%-0.43%) and Lamb.(0.18%-0.32%) showed significant decrease from urban area to suburb, the highest level at urban was mainly contributed by the high sulfur released from the production and living of urban areas into the atmosphere, and the lowest level occurred at rural area(30-36km). No significant difference was seen for soil N and S contents. The relationships between the estimated input of atmospheric N deposition and the leaves N content of and Lamb. at the sites investigated were found to be significant linear correlations, and the relationships between the estimated atmospheric SO concentration and the leaves S content of and Lamb. were also significant linear correlations(<0.05). The results indicated that N and S contents in and Lamb. leaves can be used to show the spatial variation of atmospheric N and S deposition.
对贵阳市从城区到农村3个方向采集的共296个样本中的叶片、羽藓叶片、石生藓（Hedw.）Broth.及根际土壤中的氮和硫含量进行了系统研究。根据苔藓氮含量与大气氮沉降的定量关系以及苔藓硫含量与大气二氧化硫浓度的定量关系，计算了各采样点的大气氮沉降水平和大气二氧化硫浓度。叶片氮含量（1.01%-2.37%）和羽藓（0.99%-2.42%）从大气氮沉降最高的城区到郊区显著降低，而在距离城区超过24公里的农村地区叶片氮含量略有回升，表明农村地区氮沉降增加。叶片硫含量（0.16%-0.43%）和羽藓（0.18%-0.32%）从城区到郊区显著降低，城区最高水平主要是由于城区生产生活向大气中排放的高硫量所致，最低水平出现在农村地区（30-36公里处）。土壤氮和硫含量未见显著差异。在所研究的地点，估计的大气氮沉降输入与叶片氮含量之间以及估计的大气二氧化硫浓度与叶片硫含量之间均存在显著的线性相关性（<0.05）。结果表明，叶片和羽藓叶片中的氮和硫含量可用于显示大气氮和硫沉降的空间变化。
