| Effect of cropping system on flax soil enzyme activity |
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| DOI：10.7606/j.issn.1000-7601.2019.03.23 |
| Key Words: cropping system flax soil enzyme activity soil nutrient path analysis |
| Author Name | Affiliation | | CHEN Jun | Biotechnology Institute，Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | WANG Li-guang | Biotechnology Institute，Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | YE Chun-lei | Biotechnology Institute，Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | LI Jin-jing | Biotechnology Institute，Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | OU Qiao-ming | Biotechnology Institute，Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | LUO Jun-jie | Biotechnology Institute，Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China |
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| Abstract: |
| With five different cropping systems: rotation, fallow, continuous cropping, intercropping, and fallow-cropping rotation, combined with path analysis,we studied the effect of soil nutrients on enzymes activities under different cropping systems in flax field. The results showed that: (1) In flax shapping period, there were no significant differences in soil enzyme activities in the topsoil of the study area (P<0.05), indicating that different cropping systems had no obvious effect on soil enzyme activities in the early stage of flax growth; At the flowering stage,invertase activity under T1, T2, T3 and T4 increased by 44.6%, 53.3%, 61.9% and 34.9%, respectively, compared with that under T5; urease activity under T5, T1, and T2 increased by 266.0%, 157.0% and 140.0%, respectively, compared with that under T4; alkaline phosphatase activity under T3 increased by 54.0% compared with that of T2; At the fruit stage, the catalase activities under T2 and T3 were 1.41 mL·g-1·h-1 and 1.51 mL·g-1·h-1, which were significantly higher than that of T1, T4, and T5. (2) In flax flowering period, urease activity of T2 and T5 were 1.74 mg·g-1·d-1 and 1.70 mg·g-1·d-1, respectively, which were significantly higher than that of T1, T3 and T4 in subsoil; catalase activity under T1 increased by 212.0% compared to T5; alkaline phosphatase activity of T5 increased by 21.6% compared with T4. (3) Invertase had a significant positive correlation with urease but negative correlation with alkaline phosphatase and the other enzymes. (4) In topsoil, different soil enzyme activities were affected by multiple effects of soil nutrient factors: pH and total phosphorus content promoted the activities of invertase and catalase while the organic matter and pH content promoted alkaline phosphatase activity; In subsoil, soil enzyme activities were affected by the multiple effects of soil factors, mainly limiting factors and the number of limiting factors was much greater than that in the topsoil. |
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