CAJ | 학술논문

通过设置在陇中黄土高原半干旱区的豌豆-小麦-豌豆(W-P-W)和小麦-豌豆-小麦(P-W-P)轮作系统的长期定位试验,探讨了土壤有机碳及活性有机碳组分对不同耕作措施的响应。结果表明：保护性耕作的3个处理均能不同程度地提高两种轮作次序下土壤 SOC、ROC 和 MBC 的含量,其中免耕和秸秆覆盖结合处理效果最佳。同时,各处理土层的含碳量均随土壤深度的增加而降低。与免耕处理相比,免耕秸秆覆盖(NTS)、免耕不覆盖(NT)和传统耕作秸秆还田(TS)处理能够显著增加表层(0~30 cm)土壤有机碳的含量,但降低了深层(30~80 cm)土壤有机碳的含量,说明与传统耕作相比,3种保护性耕作有利于表层土壤有机碳的积累,而不利于深层土壤有机碳的积累。
통과설치재롱중황토고원반간한구적완두-소맥-완두(W-P-W)화소맥-완두-소맥(P-W-P)륜작계통적장기정위시험,탐토료토양유궤탄급활성유궤탄조분대불동경작조시적향응。결과표명：보호성경작적3개처리균능불동정도지제고량충륜작차서하토양 SOC、ROC 화 MBC 적함량,기중면경화갈간복개결합처리효과최가。동시,각처리토층적함탄량균수토양심도적증가이강저。여면경처리상비,면경갈간복개(NTS)、면경불복개(NT)화전통경작갈간환전(TS)처리능구현저증가표층(0~30 cm)토양유궤탄적함량,단강저료심층(30~80 cm)토양유궤탄적함량,설명여전통경작상비,3충보호성경작유리우표층토양유궤탄적적루,이불리우심층토양유궤탄적적루。
Long term field experiment on the responses of soil organic carbon (SOC)and active organic carbon (AOC)to different tillage patterns were conducted in Dingxi City located on the western Loess Plateau.The experiment was set with two rotation sequences,phase 1 started with field pea (Pisum sati-vum )followed by spring wheat (Triticum aestivum )(P→W ),whereas,phase 2 started with spring wheat followed by field pea (W→P).The effects of conventional tillage and three conservation agriculture pat-terns,conventional tillage(T),conventional tillage with stubble incorporation(TS),no till with no stubble (NT)and no till with stubble retention(NTS)were studied.Readily oxidizable carbon (ROC)and microbi-al biomass carbon (MBC)were considered as indicators of AOC,and were measured together with SOC in soil layers of 0~5,5~10,10 ~30,30 ~50 and 50 ~80 cm.It was shown that the conservation tillage pat-terns,NTS,TS and NT,increased the concentration of SOC,ROC and MBC.In both rotation sequences, NTS treatment showed the highest values in the concentration of carbon among the different tillage pat-terns.Meanwhile,carbon fractions had a declining trend with the increasing depth along the soil profile. Total SOC content was significantly increased in 0~30 cm soil layer,while it decreased in 30~80 cm soil layer in NTS,NT and TS treatment.