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同时测定了从贵阳市区到农村3个方向采集的樟树叶、马尾松叶、根际土以及苔藓共计296个样品的氮、硫含量,结合苔藓氮、硫含量估算了相应区域大气氮沉降量和SO_2浓度.结果表明樟树叶氮含量(1.01%~2.37%)和马尾松叶氮含量(0.99%~2.42%)在市区最高,往外明显降低,而在较远农村区域(>24 km)又出现回升,反映了农村地区大气输入的氮有所增加;叶硫含量变化范围分别为0.16%~0.43%和0.18%~0.32%,均呈现在市区最高,向外逐渐降低的趋势,在距市区最远处(30~36 km)达到最低值,表明市区的生产生活向大气输入了较高的硫.各区域土壤氮、硫含量均无显著差异,将樟树、松树叶氮、硫含量分别与大气氮沉降量和SO_2浓度(由苔藓氮、硫值计算)进行线性回归分析,发现樟树、松树叶氮含量与大气氮沉降量以及樟树、松树叶硫含量与大气SO_2浓度均呈显著正相关(P<0.05).研究表明维管束植物樟树与马尾松叶组织氮、硫含量的变化特征能同时很好地指示贵阳区域大气氮、硫沉降的空间变化.
The contents of nitrogen and sulfur in 296 samples of Camphor leaf, Pinus massoniana leaf, rhizosphere soil and moss collected in three directions from urban area to rural area of Guiyang were measured at the same time. The contents of nitrogen in the corresponding area (1.01% -2.37%) and Pinus massoniana leaves nitrogen content (0.99% -2.42%) were the highest in the urban area and significantly decreased in the outlying areas, whereas in the far rural areas (> 24 km) Which reflected the increase of nitrogen input from the atmosphere in rural areas. The content of sulfur in leaves varied from 0.16% to 0.43% and from 0.18% to 0.32% respectively, which showed the highest trend in the urban area and gradually decreased outward The farthest distance from urban area (30-36 km) reached the lowest value, which indicated that the production and living in the urban area imported higher sulfur into the atmosphere.The contents of soil nitrogen and sulfur were not significantly different in all areas, The linear regression analysis between sulfur content and atmospheric nitrogen deposition and SO 2 concentration (calculated from moss nitrogen and sulfur values) showed that nitrogen content, atmospheric nitrogen deposition, sulfur content in camphor tree and pine and atmospheric SO_2 concentrations Significantly positive correlation (P <0.05) .Studies showed that vascular bundle plant camphor The changes of nitrogen and sulfur content in tree and Pinus massoniana leaf can also indicate the spatial variation of atmospheric N and S deposition in Guiyang at the same time.