Effects of straw incorporation on the stratification of the soil organic C, total N and CN ratio in a semiarid region of China》.pdf

Soil Tillage Research 153 (2015) 28–35 Contents lists available at ScienceDirect Soil Tillage Research journal homepage: www.else vie /locate /still Effects of straw incorporation on the stratification of the soil organic C, total N and C:N ratio in a semiarid region of China a,b a,b a,b a,b a,b,* Peng Zhang , Ting Wei , Yuling Li , Ke Wang , Zhikuan Jia , Qingfang Han a,b, Xiaolong Ren a,b a The Chinese Institute of Water-saving Agriculture, Northwest AF University, Yangling 712100, Shaanxi, China b Key Laboratory of Crop Physi-ecology and Tillage Science in Northwestern Loess Plateau, Ministry of Agriculture, Northwest AF University, Yangling 712100, Shaanxi, China A R T I C L E I N F O A B S T R A C T Article history: The soil degradation caused by conventional tillage in rain-fed areas of northwest China is known to Received 12 November 2014 reduce crop yields because of major losses of soil organic carbon and nutrients. To evaluate the effects of Received in revised form 13 April 2015 straw incorporation on soil organic carbon (SOC) and total nitrogen (STN) sequestration capacity in Accepted 23 April 2015 loessial soil, we investigated the effects of straw incorporation on SOC, STN and crop yield in semiarid areas of southern Ningxia for a 4-year period (2007–2010). Four treatments were tested: (i) n