Tillage systems influence the abundance and composition of autotrophic CO2-fixing bacteria in wheat soils in North China

Effects of different short‐term tillage managements on rhizosphere soil autotrophic CO2‐fixing bacteria in a double‐cropping rice paddy field

“…These results demonstrated that soil pH and other soil available nutrient content provided available nutrients for soil microorganism growth (Yuan et al, 2012;Xiao et al, 2014), which suggested that those factors were significantly associated with the growth of soil autotrophic microbes. These findings were in agreement with the Lu et al (2019) results, who found that copy number of cbbL positively correlated with DOC content and negatively with soil bulk density. The main reason was attributed to that cbbL-carrying bacterial composition was significantly affected by soil bulk density and also by soil MBC content.…”

“…In the present study, the results indicated that abundance of rhizosphere soil cbbL gene was positively correlated with soil properties [soil total N, soil available phosphorus (AP), soil available potassium (AK), SOC, DOC and MBC], while negatively correlated with soil bulk density. Some soil properties, such as soil pH, were known as a key factor driving soil community development (Li et al ., 2020), and other physicochemical soil factors may limit or co‐limit the growth of soil autotrophic bacteria (Ge et al ., 2016; Lu et al ., 2019). These results demonstrated that soil pH and other soil available nutrient content provided available nutrients for soil microorganism growth (Yuan et al ., 2012; Xiao et al ., 2014), which suggested that those factors were significantly associated with the growth of soil autotrophic microbes.…”

“…Meanwhile, these results showed that abundance of rhizosphere soil cbbL gene and RubisCO activity with CT, RT and NT treatments was increased, compared with RTO treatment. Therefore, these results were consistent with our hypothesis that abundance of rhizosphere soil cbbL gene and RubisCO activity was increased in the double‐cropping rice paddy field by combined application of tillage with crop residue incorporation managements, the reason may be attributed to that SOC, MBC, DOC and soil total nitrogen (TN) contents with CT, RT and NT treatments were higher (Jiang et al ., 2011; Lu et al ., 2019; Tang et al ., 2020). On the other hand, higher mineral N content in the rhizosphere soil reduced methane oxidation activity (Yonemura et al ., 2014), and this effect may also increase soil autotrophic CO 2 fixation activity.…”

“…Compared with conventional tillage, soil total bacteria and cbbL ‐carrying bacteria in paddy field were increased with no‐tillage practice, but activity of associated CO 2 fixation was significantly decreased with no‐tillage practice (Ge et al ., 2016). However, other studies found that number of 16S rRNA gene copy and abundance of cbbL ‐carrying bacteria in soil were increased with conventional tillage practice compared with no‐tillage practice (Lu et al ., 2019). Meanwhile, the results also indicated that the copy number of cbbL gene was positively correlated with dissolved organic carbon (DOC) content and negatively with soil bulk density (Lu et al ., 2019).…”

“…However, other studies found that number of 16S rRNA gene copy and abundance of cbbL ‐carrying bacteria in soil were increased with conventional tillage practice compared with no‐tillage practice (Lu et al ., 2019). Meanwhile, the results also indicated that the copy number of cbbL gene was positively correlated with dissolved organic carbon (DOC) content and negatively with soil bulk density (Lu et al ., 2019).…”