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1 前言根系的生长与枯死,总是伴随于林木的生长与采伐而交替进行的。特别是在一般林地上,由于除伐、间伐或主伐及自然枯死而产生的根系枯烂,对土壤理化性质的影响是很大的,此外,在没有采伐(自然生长)的情况下,也会由于土壤坚实,通气不良而造成根尖的生长与枯死交替进行,而导致根系分布向外扩张。在深层土壤里,曾经存在过植物的地方产生了许多孔隙,根据孔隙周围附着的根系分泌物观察到氧化铁斑点的存在。
1 Introduction Root growth and withering are always alternated with the growth and harvesting of trees. Especially in the general woodland, the root rot caused by de-logging, thinning or primary cutting and natural withering has a great impact on the physical and chemical properties of the soil. In addition, in the absence of harvesting (natural growth), As the soil is solid, poor ventilation caused by the root tip of the alternating growth and withered, leaving the root distribution of outward expansion. In deep soils, there were many pores where plants had been present, and the presence of iron oxide spots was observed based on the root exudates attached around the pores.