<正>对重庆酸雨区不同优势等级马尾松单木的生物量及根系分布特征进行了系统调查。结果表明：马尾松个体生物量中地上部分占90%以上，根系不足10%，各器官生物量所占比例顺序从大到小依次为：干、枝、根、皮、叶。不同优势等级马尾松林木的根系分布深度与幅度有很大区别，优势木垂直根系深度可达130cm，水平根系集中在半径为3m的范围内；而非优势木垂直根系一般不超过80cm，水平根系集中在1.5m为半径的范围内。不同径级根系在根系生物量中所占比例顺序从大到小依次为：粗根、大根、中根、小根、细根，其中粗根和大根占总根量的90%以上，中、小、细根不足10%。通过根钻法调查酸化土壤中生长的马尾松林木细根的分布特征，发现在40cm深度范围内有大量马尾松细根存在，并在表层土壤较为集中；细根量随距样木距离的加大而不断减少，一般在距样木2.0m的位置减至最低。

By using the geographic information system (GIS) and remote sensing (RS) and the fundamentals of landscape ecology, at the same time the high-resolution data of QuickBird satellite image as the main information source. landscape patterns of the urban green space in Shenzhen city were analyzed in this paper. The results shnwed that the whole green space coverage reached 51.36% in Shenzhen city, but the structure of green space landscape was unreasonable with the higher fragmentation and lower fractal dimension. Some construction proposals of Shenzhen city were proposed in light of these current states.