Tang Xiao-hong, Shao Jing-an, Gao Ming, Wei Chao-fu, Xie De-ti, Pan Gen-xing
College of Resource and Environment, Southwest University, Chongqing 400716, China.
Ying Yong Sheng Tai Xue Bao. 2007 May;18(5):1027-32.
A 13 year experiment was conducted to study the effects of conservational tillage on the aggregate composition and organic carbon storage in purple paddy soil of Sichuan Basin. The results showed that under no-tillage and ridge culture (rice-rape) (NR-RR), no-tillage and plain culture (rice-rape) (NP-RR), no-tillage and ridge culture (rice-green manure) (NR-RGM), tillage and ridge culture (rice-rape) (TR-RR), and tillage and plain culture (rice-rape) (TP-RR), the proportion of macroaggregates in 0-10 cm soil layer was 23%, 69%, 9%, 36%, and 28% higher than that under conventional tillage (CT) (12%), respectively, while in 10-20 cm soil layer, this proportion under conservational tillage was 9%-38% lower than that under CT. The organic carbon storages in the macroaggregates at the depth of 0-10 cm were 13%, 31% and 32% higher under no-tillage and ridge culture (rice-fallow) (NR-RF), NR-RR and NR-RGM than under CT, respectively, while that at the depth of 10-20 cm was 28%-54% lower. The differences in organic carbon storage between macro- and microaggregates were smaller in 10-20 cm layer than in 0-10 cm layer. Under conservational tillage, the organic carbon storage was 8%-28% higher in 0-10 cm layer but 4%-22% lower in 10-20 cm layer, compared with that under CT. After converted from CT to conservational tillage for 13 years, the mean organic carbon sequestration rate was 53 g x m(-2) x a(-1) and 25 g x m(-2) x a(-1) at the depths of 0-10 cm and 10-20 cm, while under CT, it was 26 g x m(-2) x a(-1) and 33 g x m(-2) x a(-1), respectively. Conservational tillage was favorable to the formation of macroaggregates in surface soil layer and the enhancement of soil total organic carbon storage.
开展了一项为期13年的试验，以研究保护性耕作对四川盆地紫色水稻土团聚体组成和有机碳储量的影响。结果表明，在免耕垄作（稻-油）（NR-RR）、免耕平作（稻-油）（NP-RR）、免耕垄作（稻-绿肥）（NR-RGM）、翻耕垄作（稻-油）（TR-RR）和翻耕平作（稻-油）（TP-RR）处理下，0-10厘米土层中粗团聚体的比例分别比传统耕作（CT）（12%）高23%、69%、9%、36%和28%，而在10-20厘米土层中，保护性耕作下该比例比CT低9%-38%。在免耕垄作（稻-休耕）（NR-RF）、NR-RR和NR-RGM处理下，0-10厘米深度粗团聚体中的有机碳储量分别比CT高13%、31%和32%，而在10-20厘米深度则低28%-54%。10-20厘米土层中粗、微团聚体之间的有机碳储量差异比0-10厘米土层中的小。与CT相比，保护性耕作下0-10厘米土层的有机碳储量高8%-28%，但10-20厘米土层低4%-22%。从CT转换为保护性耕作13年后，0-10厘米和10-20厘米深度的平均有机碳固存率分别为53克·米-2·年-1和25克·米-2·年-1，而在CT下分别为26克·米-2·年-1和33克·米-2·年-1。保护性耕作有利于表层土壤中粗团聚体的形成和土壤总有机碳储量的增加。
