摘要
土壤有机碳矿化与陆地生态系统碳循环和全球气候变化密切相关,在推广保护性耕作的背景下,研究揭示耕作措施与土壤有机碳稳定性的关系十分必要。本研究采集土壤样本,进行为期182 d的有机碳矿化培养,通过土壤有机碳矿化特征、酶活性变化,探讨了土壤理化因子、酶活性对土壤有机碳矿化的影响。结果表明,随培养时间的延长,经过不同耕作方式背景下土壤有机碳矿化速率随时间变化呈现出相同的规律,即培养前期矿化速率快速下降、后期趋于平稳;不同耕作方式后的0~20 cm土层土壤有机碳累积矿化量、酶活性均显著高于20~40 cm土层(P<0.05),但各土层不同土壤酶活性之间呈极显著正相关(P<0.01);不同旋耕方式对土壤有机碳固碳能力影响不同,在研究区域推广深松(耕)与旋耕相结合的耕作方式可减少土壤碳损失,对于节能减排、减缓农业生产对气候变暖的压力有积极作用。
Soil organic carbon(SOC)mineralization is closely related to terrestrial ecosystem C cycle and global climate change.With the development of research on C cycle and conservation tillage,it is urgent to explore the relationship between tillage measures and SOC stability.In this study,soil samples were collected at the maize harvest period under different tillage measures and then were incubated for 182 days.We analyzed SOC mineralization mechanism,as affected by soil physical and chemical properties and enzyme activities.The results showed that SOC mineralization rate under different tillage measures had a similar trend.SOC mineralization decreased rapidly at the early stage of incubation and then tended to be stable at later stage of incubation.The cumulative mineralization amount of SOC at 0-20 cm depth was significantly higher(P<0.05)than that at 20-40 cm depth.Soil enzyme activities at 0-20 cm depth were higher than those at 20-40 cm depth.Significant positive relationships among different soil enzyme activities in each soil layer were found(P<0.01).The effects of different rotary tillage measures on SOC sequestration capacity varied.The combination of subsoiling(tillage)and rotary tillage in the study area can reduce soil carbon loss,exerting positive effect on energy saving and emission reduction,and slowing down the pressure of agricultural production in the context of climate warming.
作者
王永慧
轩清霞
王丽丽
杨殿林
赵建宁
李刚
修伟明
红雨
WANG Yong-hui;XUAN Qing-xia;WANG Li-li;YANG Dian-lin;ZHAO Jian-ning;LI Gang;XIU Wei-ming;HONG Yu(Agro-Environmental Protection Institute,Ministry of Agriculture,Tianjin 30019,China;Qihe Agricultural Bureau in Shandong Province,Qihe251100,China;College of Life Science and Technology,Inner Mongolia Normal University,Hohhot 010022,China)
出处
《土壤通报》
CAS
CSCD
北大核心
2020年第4期876-884,共9页
Chinese Journal of Soil Science
基金
国家重点研发计划课题子课题(2016YFD0201009)
天津市自然科学基金(18JCYBJC23000)
中央级公益性科研院所基本科研业务费专项(2018-szjj-wll)
天津市青年拔尖人才项目(2018-tjbjrc-wll)资助
关键词
耕作方式
土壤有机碳矿化
固碳能力
土壤酶
Tillage method
Soil organic carbon mineralization
Carbon sequestration ability
Soil enzyme
