Abstract: In order to explore the influence of different tillage modes combined with straw-returning on the purple soil carbon pool in the hill in Middle Sichuan and the maize yields. The experiment set four treatments in 2015 and 2016:RTS (Rotary tillage with straw),NTS (No-tillage with straw),RT(Rotary tillage),NT(No-tillage).The results showed that straw returning increased the soil organic carbon content,soil organic carbon increased by 21.9% in 0-10 cm depth and 1.6%in 10-20 cm depth compared NTS treatment with NT treatment during the maize maturity 2016.And compared RTS treatment with RT treatment,the soil organic carbon increased by 23.1%and 15.9%at the same time. Compared with straw not returning to the field,straw-returning treatment increased the soil active organic carbon by 40.1% in 0-10 cm depth and 17.5%in 10-20 cm depth during the maize maturity 2015.In 2016,the soil active organic carbon increased by 70.0%and 16.0%. Straw-returning increased soil carbon pool activity,activity index,carbon pool index and carbon pool management index. No tillage treatment increased soil carbon pool activity,activity index and carbon pool management index. Compared with rotary tillage treatment,no tillage treatment increased soil layer carbon pool activity by 15.7%in 0-10 cm depth and 28.9%in 10-20 cm depth,carbon pool management index increased by 12.5%and 46.6%. The yields increased by 35.3% compared RTS with NT.

Key words: Tillage methods, Straw-returning, Soil carbon pool, Soil active organic carbon, Carbon pool management index

CLC Number: 

• S141

• S513