摘要
砒砂岩区沙棘种植地区,从中尺度上来看,沙棘与其他林、草、农地、河道、路面等一起,组成了6类水平空间结构类型。从小尺度上来看,沙棘人工林主要呈片状、横带状、纵带状、零散等4种分布类型,而这4种分布类型又与自然群落分布的随机分布、均匀分布、集群分布、嵌式分布等类型发生着一定的关联。对于沙棘来说,集群分布并不是一种十分有利的类型,要采取带状平茬等措施,防止沙棘郁闭后的早衰和死亡;而横带、纵带甚至零散分布类型,应为适应于当地自然条件的最佳水平结构类型,营林工作中应予以培育。
In the soft sandstone area, seabuckthorn artificial forest, together with other bushes, for- est, grassland, cropland, riverbed, ways, forms 6 kinds of patterns in middle scale of the region, whereas artificial seabuckthorn forest appears to be patches, both horizontal and vertical belts, ran- dom or single ones in the small scale. The four patterns of seabuckthorn relate to random, uniform, clumped and contagious distributions which are the normal types for natural plant communities. For artificial seabuckthorn forest, clumped distribution is not useful as the high density in an arid area like the soft sandstone area, so cutting in belt is needed to avoid senescence and death, for a long time cov- ered seabuckthorn forest Belt patterns of both horizontal and vertical, even small patches of seabuck- thorn are suggested to foster for a good types of seabuckthorn forest in the cultivation practice in the area for the limited precipitation and soil water.
基金
晋陕蒙砒砂岩区沙棘生态工程(水规计[1998]111号)
关键词
砒砂岩
沙棘
人工林
中尺度
小尺度
水平分布
结构
soft sandstone
seabuckthorn
artificial forest
medium scale
small scale
pattern
