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以实施7年的中国科学院禹城综合试验站冬小麦-夏玉米轮作免耕长期定位试验场为对象,系统研究免耕条件下土壤总碳(TC)、有机碳(SOC)、无机碳(SIC)的变化,为进一步评价免耕措施对华北地区潮土碳库的影响提供数据支持。研究设置免耕秸秆覆盖(NTRC)、免耕施用有机肥(NTRR)、常规耕作(CT)3种处理,分析表层(0-20cm)及深层(20-60cm)土壤TC、SOC及SIC的变化特征和影响因素。主要结果为:NTRC和NTRR能够增加0-20cm土层TC含量及储量,但降低20-60cm土层TC含量及储量,0-60cm总碳储量表现为NTRC>CT>NTRR;与CT相比,NTRC能够显著增加0-20cm而降低20-60cm土层SOC含量及储量,NTRR增加了0-5cm土层SOC含量及储量,在5-60cm则呈降低趋势,0-60cm土层SOC储量表现为CT>NTRC>NTRR;NTRC增加了0-60cm土层SIC储量,而NTRR则影响较小。TC与SOC呈显著正相关(P<0.05),而与SIC呈显著负相关(P<0.05),说明总碳的变化趋势与SOC一致,与SIC相反。
This study systematically studied the effects of soil total carbon (T C), organic carbon (SOC), inorganic carbon (SIC), soil organic carbon (TOC) Which will provide data support for further evaluating the impact of no-till tillage on the soil carbon pool in North China. The effects of no-tillage straw mulching (NTRC), no-tillage organic manure (NTRR) and conventional tillage (CT) treatments on the changes of TC, SOC and SIC in soils from 0-20 cm and from 20-60 cm Characteristics and influencing factors. The main results are as follows: NTRC and NTRR can increase TC content and storage in 0-20cm soil layer, but decrease TC content and storage in 20-60cm soil layer, NTRC> CT> NTRR in 0-60cm soil layer. Compared with CT, NTRC can significantly increase 0-20cm and reduce 20-60cm soil SOC content and reserves, NTRR increased 0-5cm soil SOC content and reserves, 5-60cm showed a downward trend, 0-60cm soil SOC reserves as CT> NTRC> NTRR; NTRC increased SIC reserves in 0-60cm soil layer, while NTRR had less effect. There was a significant positive correlation between TC and SOC (P <0.05) and negative correlation with SIC (P <0.05), indicating that the trend of total carbon was consistent with that of SOC, contrary to SIC.