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研究了陇中黄土高原半干旱区的小麦→豌豆→小麦轮作系统下免耕(NT)、传统耕作+秸秆还田(TS)、免耕+秸秆覆盖(NTS)等保护性耕作措施对土壤容重和土壤养分的影响。结果表明:保护性耕作措施可显著提高0~5cm层土壤有机碳、氮(全氮、速效氮)、磷(全磷、速效磷)、钾(全钾、速效钾)的含量,其中,NTS效果最优,可显著降低0~30cm各土层土壤容重;土壤有机碳与氮(全氮、速效氮)、磷(全磷、速效磷)各因子存在极显著正相关关系。与传统耕作相比,NTS、NT、TS降低土壤容重,提高了土壤养分的含量。豌豆田土壤容重分别降低4.80%、2.67%、4.00%,有机碳分别提高10.52%、4.63%、4.83%,全氮分别提高13.83%、7.45%、8.51%;春小麦田土壤容重分别降低4.62%、3.08%、4.62%,有机碳分别提高11.99%、7.78%、12.10%,全氮分别提高11.11%、6.67%、3.33%。
The effects of tillage (NT), traditional tillage + straw returning (TS), no-tillage + straw mulching (NTS) and other tillage practices on soil bulk density And soil nutrients. The results showed that conservation tillage could significantly increase soil organic C, N (available nitrogen), P (total phosphorus, available phosphorus), potassium (total potassium, available potassium) in 0-5 cm soil layer. Which could significantly reduce soil bulk density of 0 ~ 30cm soil layer. There was a significant positive correlation between soil organic carbon and nitrogen (total nitrogen, available nitrogen), phosphorus (total phosphorus, available phosphorus). Compared with the traditional tillage, NTS, NT and TS reduce the bulk density of soil and increase the content of soil nutrients. Soil bulk density in pea field decreased by 4.80%, 2.67% and 4.00%, and organic carbon increased by 10.52%, 4.63% and 4.83%, and total nitrogen increased by 13.83%, 7.45% and 8.51% 3.08% and 4.62% respectively. Organic carbon increased by 11.99%, 7.78% and 12.10%, and total nitrogen increased by 11.11%, 6.67% and 3.33% respectively.