不同种植年限对稻-蒜轮作土壤团聚体水稳定性及其养分的影响
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(四川农业大学资源学院,四川 成都 611130)

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苟宁倢(1997-),硕士研究生,主要研究方向为土壤肥力与施肥。E-mail:gouningjie@126.com。

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基金项目:国家重点研发计划(2017YFD0301701);四川省应用基础项目(2018JY0002)。


Effects of different planting years on soil aggregate water stability and nutrients in rice-garlic rotation
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(College of Resources,Sichuan Agricultural University,Chengdu Sichuan 611130)

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    摘要:

    研究稻-蒜轮作土壤团聚体稳定性及其养分变化对种植年限的响应特征,以期为长期稻-蒜轮作土壤的施肥措施及其可持续利用提供科学依据。以成都平原稻-蒜轮作土壤为研究对象,研究分析不同稻-蒜轮作种植年限(<10、15、>20年)对不同土层(0~20、20~40 cm)土壤机械组成、团聚体分级及其养分含量的影响。结果表明:(1)稻-蒜轮作种植年限的增加使0~20 cm土层粘粒含量显著增加了28.27%,粉砂粒组分显著降低了7.89%;(2)稻-蒜轮作的土壤均以1~0.25 mm团聚体为优势粒径,与稻-蒜轮作种植年限<10年相比,种

    Abstract:

    The response characteristics of rice-garlic rotation soil aggregates water stability and their nutrient changes to planting years were studied in order to provide a scientific basis for the long-term rice-garlic rotation soil fertilization measures and its sustainable utilization.Taking the rice-garlic rotation soil in Chengdu Plain as the research object,the effects of different planting years(<10,15,>20 years)on soil mechanical composition,aggregate classification and nutrients in two soil layers(0~20,20~40 cm)were studied.The results showed:(1)With the increase of planting years in the rice-garlic rotation,the clay in the cultivation layer significantly increased by 28.27% and the silt significantly decreased by 7.89% in 0~20 cm soil layer.(2)1~0.25 mm aggregates diameter was the dominant soil aggregates diameter for all years of rice-garlic rotation.Compared with <10 years,planted >20 years decreased >1 mm aggregates content and increased <0.25 mm aggregates content;Meanwhile,the mean weight diameter(MWD)and geometric mean diameter(GMD)of planting >20 years were significantly reduced by 14.28%~26.83% and 21.74%~37.93%,respectively,compared with the remaining years. (3)Compared with planting <10 years,when planting >20 years,the CEC,C/N and the contents of organic carbon,available phosphorus,available potassium of soil aggregates all showed a downward trend,but the contents of alkaline hydrolysis nitrogen of soil aggregates showed an increasing trend.(4)>1 mm aggregates content was significantly positively correlated with aggregate MWD,GMD,CEC value,C/N,contents of organic carbon,available phosphorus,available potassium,and <0.25 mm aggregate content increase was significantly positively correlated with alkaline hydrolysis nitrogen.In summary,long-term rice-garlic rotation(>20 years)tended to destroy large soil aggregates(>1 mm)and form small soil aggregates(<0.25 mm),which decreased the water stability of soil aggregates,and was not conducive to the conservation of soil nutrients by aggregates and the sustainable utilization of paddy soil.

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苟宁倢,李冰,王昌全,黄容,李启权,曹舒蕾,李艾雯,康博.不同种植年限对稻-蒜轮作土壤团聚体水稳定性及其养分的影响[J].中国土壤与肥料,2022,(7):178-189.

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  • 收稿日期:2021-04-21
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  • 录用日期:2021-06-12
  • 在线发布日期: 2022-09-15
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