【摘要】 在吉林省西部半干旱区设置连续免耕(CN)、连续旋耕(CR)、深翻-免耕-免耕(PN)、深翻-旋耕-旋耕(PR)4个处理，探究不同轮耕组合对吉林省西部半干旱区玉米土壤团聚体及其有机碳分布特征的影响。结果表明，免耕可以增加≥0.25 mm粒级水稳性大团聚体含量，PN处理>0.25 mm粒级机械稳定性团聚体含量最高，在0～≤20 cm和20～40 cm土层分别比CR处理提高了2.00%和5.90%。PN处理0～≤20 cm土层平均重量直径、几何平均直径均最高，分别比CR处理增加5.10%和2.70%;20～40 cm土层分别增加了9.40%和15.50%。0～≤20 cm土层CN、PN、PR处理土壤有机碳含量均显著高于CR处理(P<0.05),20～40 cm土层PN和PR处理有机碳含量最高。CN处理0～≤20 cm土层各粒级团聚体有机碳最高，在20～40 cm土层中PN和PR处理各粒级团聚体有机碳均显著高于CN、CR处理(P<0.05)，深翻增加了下层土壤团聚体有机碳含量。PN和PR处理更有利于土壤团聚体及其有机碳的稳定，有效提高了20～40 cm土层土壤养分固持与供应能力，实现了全耕层(0～40 cm)培肥。更多还原

【Abstract】 To study rotational tillage effects on maize soil aggregates and organic carbon in semi-arid western Jilin, this experiment set up: continuous no-tillage(CN), continuous rotary tillage(CR), deep tillage-no-tillage-notillage(PN), and deep tillage-rotary tillage-rotary tillage(PR). The results showed no-tillage increased>0.25 mm large aggregate content, with PN treatment achieving the highest mechanically stable aggregate content, being2.00% and 5.90% higher than CR in 0-≤20 cm and 20-40 cm layers respectively. In 0-≤20 cm, PN had the highest mean weight diameter(MWD) and geometric mean diameter(GMD), 5.10% and 2.70% higher than CR; in 20-40 cm,increases were 9.40% and 15.50%. Soil organic carbon in 0-≤20 cm under CN, PN, and PR was significantly higher than CR(P<0.05), with PN and PR in 20-40 cm were the highest. CN had the highest organic carbon in all aggregate sizes in 0-≤20 cm, while PN and PR showed significantly higher organic carbon than CN and CR in 20-40 cm,with greater organic carbon contributions than CR(P<0.05). Deep tillage increased subsoil aggregate organic carbon.Overall, PN and PR treatments better stabilized soil aggregates and organic carbon, improving 20-40 cm layer nutrient retention and supply capacity, making full tillage(0-40 cm) fertilization optimal for regional sustainable agriculture.更多还原