植物根对 CO_2的固定最早在大麦上有过报道,根部固定的碳可运转到叶部。关于洋葱和大豆根对碳的固定也有过报道。最近研究指出,大豆根和根瘤具有固定 CO_2的活性系统。Coker 等认为,固定的 CO_2为产生能量的代谢作用提供了基质,并为 NH_4~+的同化和氨基酸的生物合成提供碳架。其他研究者报道,供给柑桔实生苗根系大量 CO_2时,干物质总量明显增加。马铃薯植株根际周围 CO_2的富集,可增加干物质含量、促进块茎形成、提高光合速率、抑制光呼吸速率和改变激素平衡。Stolwijk 等报道,植株通过根系吸收的 CO_2量很少, Plant root fixation of CO 2 has been reported on barley as early as possible, and the root fixed carbon can be transported to the leaf. There have also been reports on the immobilization of carbon onions and soybean roots. Recent studies have shown that soybean roots and nodules have a fixed CO 2 activity system. Coker and colleagues argue that fixed CO 2 provides a substrate for energy-producing metabolism and provides a carbon framework for NH 4 + assimilation and amino acid biosynthesis. Other researchers reported that the total amount of dry matter was significantly increased when large amounts of CO 2 were supplied to the root of citrus seedlings. Enrichment of CO_2 around the rhizosphere of potato plants can increase dry matter content, promote tuber formation, increase photosynthetic rate, restrain photorespiration rate and change hormone balance. Stolwijk et al. Reported that the amount of CO 2 absorbed by plants through the root system is very small,