花生-南酸枣间作系统氮素利用研究
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*中国科学院知识创新项目(KZCX2-407);国家重点基础研究发展规划项目(G1999011801);IAEA合作项目部分成果


N RECOVERY IN CHOEROSPONDIAS AXILLARIS AND PEANUT(ARACHIS HYPOGAEA) ALLEY CROPPING SYSTEMS ON UDIC FERROSOL IN SUBTROPICAL CHINA
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    摘要:

    在低丘红壤花生-南酸枣间作系统中利用15N同位素示踪方法研究结果表明,5龄和9龄南酸枣分别竞争利用了施用于花生的氮肥的966%和3015%.与单作花生系统相比,5龄和9龄南酸枣间作系统中花生对表施氮肥的利用率分别下降378%和591%.间作5龄南酸枣对模拟淋溶至亚表层土壤氮素的利用率非常低下,与花生单作相比,5龄南酸枣间作系统表施氮素土壤残留没有显著差异,其安全网作用不明显.随着树龄增加,南酸枣根系充当安全网作用的潜力被证实.9龄南酸枣对模拟淋溶至35cm和55cm深度土壤氮素的利用率分别为3379%和1474%,与花生单作相比,其表施氮素在0~60cm土层残留降低241%.

    Abstract:

    15N-labell fertilizer was used to study on N competition between tree and peanuts,and to test the potential of tree roots acting as safety-net on Choerospondias axillaris cropped with peanut(Arachis hypogaea) in subtropical China.Five-year-old and nine-yea-rold Choerospondias axillaris recovered 9.66% and 30.15% of the N applied at topsoil of peanut area,respectively.Compared with sole peanut system,N recovery by peanut was decreased by 37.8%in 5-year-old and 59.1% in 9-yea-rold Choerospondias axillaris alley cropping system,respectively.The role of 5-yea-rold Choerospondias axillaris acting as a safetynet was not obvious,since it recovered little N from subsoil and did not decrease N residual in the soils. With increasing tree age,9-yea-rold Choerospondias axillaris showed its potential to act as a safety-net, since it recovered 33.79% N from 35cm soil layer and 14.74% N from 55 cm soil layer,respectively,and N residual in 0~60 cm soil layer was decreased by 24.1%,compared with that in sole peanut system.

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王兴祥,张桃林,何园球,张斌,王明珠.花生-南酸枣间作系统氮素利用研究[J].土壤学报,2003,40(4):588-592. DOI:10.11766/trxb200109090416 Wang Xing-xiang, Zhang Tao-lin, He Yuan-qiu, Zhang Bin, Wang Ming-zhu. N RECOVERY IN CHOEROSPONDIAS AXILLARIS AND PEANUT(ARACHIS HYPOGAEA) ALLEY CROPPING SYSTEMS ON UDIC FERROSOL IN SUBTROPICAL CHINA[J]. Acta Pedologica Sinica,2003,40(4):588-592.

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  • 收稿日期:2001-09-09
  • 最后修改日期:2002-05-08
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  • 在线发布日期: 2013-02-25
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