摘要
目的探索不同耕作方式对耕层黑土有机碳含量的影响。方法以2001年秋在吉林省德惠市中层黑土上进行了3年的田间定位试验小区土壤为研究对象,对免耕、垄作和秋翻3种耕作处理下耕层土壤有机碳的动态变化进行了分析,并采用等深度和等质量土壤碳库储量计算方法,比较了不同耕作处理对耕层土壤有机碳库储量的影响。结果不同耕作处理对黑土耕层有机碳的影响无显著性差异,而且免耕处理在短期内没有引起耕层土壤有机碳含量的明显增加,反而有所降低。与2001年试验开始时相比,3年免耕管理使表层0～5cm土壤有机碳含量仅增加了0.18%,而5～20cm土层有机碳含量则明显降低。利用等深度(0～30cm)和等质量(4040Mg)土壤碳库储量计算方法对比研究表明,将土壤容重考虑在内的等质量土壤有机碳库储量计算方法可以更准确的反映耕作对土壤有机碳库储量的影响。等质量方法计算表明,3年的免耕试验并没有使耕层土壤有机碳库储量发生明显变化。结论在质地粘重和排水不良的土壤上实行免耕,短期内土壤有机碳含量并没有增加。长期效果如何还有待观测。
[ Objective ] The short-term effects of no-tillage （NT）, moldboard plow （MP） and ridge tillage （RT） on the amount of soil organic carbon （SOC） in the plow layer （30 cm） of a black soil （clay loam） in Northeast China were studied. [Method] The tillage experiment trials were established in Dehui County, Jilin Province in 2001. Using two calculating methods based on an equivalent soil depth and soil mass SOC storages under different tillages were compared. [Result] NT practices did not lead to significant increase of SOC at the top soil （0-5 cm） compared with MP and RT practices. However, SOC contents showed a notable reduction at 5 20 cm depth. SOC storage on an equivalent soil mass in all treatments reflected the short-term effects of tillage more accurately. Three-year NT practices didn＇t stratify the storage of SOC on an equivalent soil mass in the plow layer on this clay loam black soil. [ Conclusion ] Use of no-tillage practices on this fine-textured and poor-drained black soil might not sequester more SOC than conventional tillage, at least in the short term.
出处
《中国农业科学》
CAS
CSCD
北大核心
2006年第6期1287-1293,共7页
Scientia Agricultura Sinica
基金
国家自然科学基金(40271108和40471125)
吉林省科技发展计划(20050206-4)
关键词
耕作
土壤有机碳
等质量
土壤碳库储量
黑土
Tillage
Soil organic carbon
Equivalent soil mass
SOC storage
Black soil
