土壤碳
耕作
农学
环境科学
作物轮作
常规耕作
土壤有机质
作物残渣
土壤质量
犁
作物产量
固碳
土壤水分
氮气
化学
土壤科学
作物
生物
生态学
农业
有机化学
作者
Xia Zhang,Sixu Lu,Chenguang Wang,Afeng Zhang,Xudong Wang
摘要
Abstract Tillage and mineral fertilization are important strategies for maintaining crop production, but their effects on soil organic carbon (SOC) and labile fractions in semiarid regions are controversial. A 10‐year field experiment was conducted to evaluate the effects of fertilization and tillage on SOC stock, labile fractions, soil quality and crop yields in a wheat–maize cropping system at the Loess Plateau. Results showed that balanced fertilization could provide comprehensive nutrition for crops and increase the crop residue input carbon, thereby increasing the SOC, readily oxidizable carbon, particulate organic carbon and dissolved organic carbon contents. In 0–50 cm layers, the SOC stock was increased by 3% under balanced fertilization compared to conventional fertilization. For tillage, no‐tillage (zero tillage) and subsoiling rotation with less soil disturbance and higher stabilization rate of input carbon was the most effective tillage practice for increasing SOC stock. This tillage technique increased the labile carbon contents by 41%–63%, 5%–19% and 26%–67% compared to ploughing in 0–10 cm, 20–35 cm and 35–50 cm layers, respectively. Balanced fertilization combined with no‐tillage and subsoiling rotation (BF + NS) increased carbon pool management index due to higher SOC and labile carbon contents, which contributed to the improvement of soil quality and the promotion of crop growth. Among all treatments, BF + NS treatment produced the highest SOC stock as well as wheat and maize yields. Therefore, BF + NS is the best strategy to increase SOC sequestration and to improve soil quality and productivity in semiarid regions.
科研通智能强力驱动
Strongly Powered by AbleSci AI