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《Journal of Soil and Water Conservation》 2017-04
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Effect of Straw Returning on the Contents of Soil Organic Carbon Fractions,Carbon Storage and Crop Yields of Paddy Field in Hanzhong Basin

WU Yuhong;HAO Xingshun;TIAN Xiaohong;CHEN Yanlong;ZHANG Chunhui;CHENG Hao;LI Houhua;QI Yuhang;HUANG Chong;Hanzhong Agricultural Science Research Institute;College of Natural Resources and Environment,Northwest A&F University;  
A field experiment was carried out in rice-wheat or rice-rape rotation field in Hanzhong basin,Shaanxi Province,China,to investigate the effect of wheat or rape straws returning on soil bulk density,soil nutrients,total organic carbon(TOC),active organic carbon(LOC),active organic carbon efficiency(ACL),organic carbon storage(SCS),carbon management index(CPMI)and rice yield.Six treatments were set up,including no straw returning(WSN),conventional wheat straw returning(WS),decayed wheat straw returning(WSM),no rape straw returning(RSN),conventional rape straw returning(RS)and decayed rape straw returning(RSM).Soil samples were collected at the depth of 0-5cm,5-10 cm,10-15 cm,15-20 cm and 20-25 cm soil layers,respectively.Results showed that straw returning significantly reduced soil bulk density of 0-15 cm soil layer,however,this kind of treatment had no significant effect on soil bulk density of 15-25 cm soil layer.Compared to no straw returning treatment,the soil organic carbon contents significantly increased in the wheat or rape straw returning treatments.Meanwhile,the TOC andLOC in soil decreased with the increasing of soil depth,and TOC and LOC in 0-15 cm soil layer were both higher,and had an obvious surface enrichment phenomenon.Compared to no straw returning treatment,SCS of 0-30 cm soil layer significantly increased by 21.9%~23.5% and 1.7%~6.7%in the wheat straw return treatments and rape straw return treatments,respectively.Compared to the rape straw return treatments(RS,RSM),wheat straw returning significantly increased LOC,ACL,and CPIM of 10-15 cm soil layer;whereas,LOC,ACL,and CPIM of 15-25 cm soil layer in the rape straw returning treatments were significant higher than those in the wheat straw returning treatments(WS,WSM).As for rice yield,value was the highest under WSM and RSM treatments,followed by WSN and RSN treatments,and the yield was the lowest when there was no straw returning.Correlation analysis showed that rice yield positively related with ACL of 0-10 cm soil layer.The straw returning treatment was one of the most effective farming practices to improve soil organic carbon,and crop yield in Hanzhong basin.Full wheat straw returning to field with rotary tillage significantly increased soil carbon sequestration and rice yield under the wheat-rice rotation system.
【Key Words】: Hanzhong basin rice-wheat or rice-rape rotation straw returning soil organic carbon carbon storage carbon sequestration efficiency
【Fund】: 陕西省科技统筹创新工程计划项目(2015KTCL02-21 2016KTZDNY03-01);; 省农业科技创新与攻关项目(2016NY-180)
【CateGory Index】: S153.6;S511
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