CAJ | 학술논문

以渭北黄土高原苹果园为对象，设置传统的果园清耕与间作白三叶（Trifolium repens L.）两处理，分别采集0~5、5~10、10~20 cm 及20~40 cm 土层土样，探讨了间作白三叶对苹果/白三叶复合系统总土壤有机碳（TOC）、轻组有机碳（LOCF）、重组有机碳（HOCF）的影响。结果表明：与果园清耕相比，TOC 含量及土壤有机碳密度（SOCD）显著增加，增幅随土壤深度的增加而迅速降低；0~5、5~10、10~20 cm 土层 LOCF 含量分别比清耕处理增加了7.02、4.57倍和2.49倍，LOCF 分配比例（LOCF/SOC）比清耕处理提高了7.01、4.57倍和2.51倍，说明间作白三叶较好地改善了果园 SOC 质量；与 LOCF 及 SOC 含量的增幅相比，HOCF 含量增幅较低，说明 HOCF 受间作白三叶影响较小。 LOCF 对间作白三叶敏感，是指示果园生草土壤有机碳变化的良好指标。
이위북황토고원평과완위대상，설치전통적과완청경여간작백삼협（Trifolium repens L.）량처리，분별채집0~5、5~10、10~20 cm 급20~40 cm 토층토양，탐토료간작백삼협대평과/백삼협복합계통총토양유궤탄（TOC）、경조유궤탄（LOCF）、중조유궤탄（HOCF）적영향。결과표명：여과완청경상비，TOC 함량급토양유궤탄밀도（SOCD）현저증가，증폭수토양심도적증가이신속강저；0~5、5~10、10~20 cm 토층 LOCF 함량분별비청경처리증가료7.02、4.57배화2.49배，LOCF 분배비례（LOCF/SOC）비청경처리제고료7.01、4.57배화2.51배，설명간작백삼협교호지개선료과완 SOC 질량；여 LOCF 급 SOC 함량적증폭상비，HOCF 함량증폭교저，설명 HOCF 수간작백삼협영향교소。 LOCF 대간작백삼협민감，시지시과완생초토양유궤탄변화적량호지표。
Interplanting cover crops in orchards is one of soil managements for the sustainability of orchards. Herein, we examined dynamics of soil total organic carbon(TOC)and light organic carbon fraction(LOCF)in an apple-white clover system in Weibei Loess Plateau from 2005 to 2011. Soil samples were collected at depths of 0~5 cm, 5~10 cm, 10~20 cm and 20~40 cm in clear tillage and white clover-interplanting orchards. Total organic carbon and soil organic carbon density(SOCD)in apple-white clover intercropping system were signifi-cantly increased in comparison with the clear tillage orchard. The increments, however, decreased rapidly with soil depth. Compared to the clear tillage apple orchard, the LOCF and the ratios of LOCF to TOC increased by 7.02, 4.57 times, and 2.49 times and 7.01, 4.57 times and 2.51 times at 0~5 cm, 5~10 cm, and 10~20 cm soil layer, respectively. This suggests that interplanting white clover in apple orchard could improve the quality of soil organic carbon.