Studies on PICT of soil microbial community started at the beginning of 1990s, and much progress has been made in study methods, developmental mechanisms of PICT and factors that may influence PICT.

• 对土壤微生物群落PICT的研究始于上世纪90年代，并已在多方面取得进展，包括在研究方法上的一些突破和改进。