中国农业科学 ›› 2020, Vol. 53 ›› Issue (1): 94-104.doi: 10.3864/j.issn.0578-1752.2020.01.009
收稿日期:
2019-04-22
接受日期:
2019-06-04
出版日期:
2020-01-01
发布日期:
2020-01-19
通讯作者:
丛日环
作者简介:
王昆昆,E-mail:wangkk@webmail.hzau.edu.cn。
基金资助:
KunKun WANG,ShiPeng LIAO,Tao REN,XiaoKun LI,RiHuan CONG(),JianWei LU
Received:
2019-04-22
Accepted:
2019-06-04
Online:
2020-01-01
Published:
2020-01-19
Contact:
RiHuan CONG
摘要:
【目的】探究长江流域水旱轮作制度下,化学磷肥和秸秆还田配施磷肥对作物生产力的贡献,以及对土壤磷有效性和磷素效率的影响,为农田土壤磷素管理提供科学依据。【方法】试验于2014—2018年在湖北省武汉市华中农业大学进行,选取定位试验中的3个处理,分别为:(1)不施磷(NK);(2)施磷(NPK);(3)施磷配合秸秆还田(NPK+S)。通过测定作物产量、磷含量及土壤有效磷,分析作物磷素利用效率,探讨土壤有效磷变化与磷累积盈亏的响应关系。【结果】与NK处理相比,NPK处理的油菜和水稻平均产量分别提高530.3%和35.9%,磷积累量分别提高495.3%和98.5%;与NPK处理相比,NPK+S处理的油菜和水稻平均产量分别提高19.1%和11.0%,磷积累量分别提高20.6%和11.7%;油菜产量和磷积累量对磷肥和秸秆的响应优于水稻。秸秆还田条件下,油菜和水稻的平均磷素农学效率分别提高6.8%和33.9%,油菜、水稻和周年的磷素累积利用率分别提高8.6%、17.0%和19.8%。秸秆还田对水稻磷素利用率和农学效率的影响更为显著。4年油菜水稻轮作后,不施磷处理土壤磷素累积亏缺110.2 kg P2O5·hm -2,有效磷浓为1.9 mg·kg -1;施磷处理土壤磷素累积盈余210.9 kg P2O5·hm -2,有效磷浓度(4.3 mg·kg -1)较不施磷处理提高126.3%;施磷配合秸秆还田处理土壤磷素累积盈余(222.1 kg P2O5·hm -2)较NPK处理增加5.3%,有效磷浓度(5.1 mg·kg -1)较NPK处理提高18.6%。秸秆还田显著提高了土壤有效磷浓度,但土壤磷盈余量没有明显增加。连续秸秆还田和施用化学磷肥条件下,水稻土每盈余100 kg·hm -2的磷,NPK和NPKS处理土壤有效磷分别提高1.8和2.0 mg·kg -1。秸秆还田促进了土壤磷素有效化。【结论】施磷显著增加了油菜、水稻的产量和磷积累量,提升了土壤磷盈余量和有效磷浓度;秸秆还田在施磷肥的基础上进一步增加了油菜、水稻的产量和磷积累量,提高了作物特别是水稻对磷素的利用率和农学效率,同时能够在避免土壤磷素过量积累的情况下提高土壤有效磷浓度。
王昆昆,廖世鹏,任涛,李小坤,丛日环,鲁剑巍. 连续秸秆还田对油菜水稻轮作土壤磷素有效性 及作物磷素利用效率的影响[J]. 中国农业科学, 2020, 53(1): 94-104.
KunKun WANG,ShiPeng LIAO,Tao REN,XiaoKun LI,RiHuan CONG,JianWei LU. Effect of Continuous Straw Returning on Soil Phosphorus Availability and Crop Phosphorus Utilization Efficiency of Oilseed Rape-Rice Rotation[J]. Scientia Agricultura Sinica, 2020, 53(1): 94-104.
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