| Soil properties and enzyme activities of abandoned farmland in different years in Minqin |
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| DOI：10.7606/j.issn.1000-7601.2021.01.25 |
| Key Words: Abandoned years abandoned farmland physical and chemical properties soil enzyme activity Minqin |
| Author Name | Affiliation | | WU Hao | Gansu Desert Control Research Institute, Lanzhou, Gansu 730070, China
Gansu Desert Control Research Institute, Linze, Gansu 734200, China
State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating, Wuwei, Gansu 733000, China | | WANG Lide | Gansu Desert Control Research Institute, Lanzhou, Gansu 730070, China
Gansu Hexi Corridor Forest Ecosystem National Research Station, Wuwei, Gansu 733000, China
State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating, Wuwei, Gansu 733000, China | | SONG Dacheng | Gansu Desert Control Research Institute, Lanzhou, Gansu 730070, China
Gansu Hexi Corridor Forest Ecosystem National Research Station, Wuwei, Gansu 733000, China
State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating, Wuwei, Gansu 733000, China | | GUO Chunxiu | Gansu Desert Control Research Institute, Lanzhou, Gansu 730070, China
State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating, Wuwei, Gansu 733000, China | | WANG Fanglin | Gansu Desert Control Research Institute, Lanzhou, Gansu 730070, China
State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating, Wuwei, Gansu 733000, China | | HE Fanglan | Gansu Desert Control Research Institute, Lanzhou, Gansu 730070, China
Gansu Hexi Corridor Forest Ecosystem National Research Station, Wuwei, Gansu 733000, China
State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating, Wuwei, Gansu 733000, China | | ZHAO Heran | Gansu Desert Control Research Institute, Lanzhou, Gansu 730070, China
Gansu Hexi Corridor Forest Ecosystem National Research Station, Wuwei, Gansu 733000, China
State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating, Wuwei, Gansu 733000, China |
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| Abstract: |
| Abandoned farmland in different years in Minqin (1, 2, 4, 8 a, and 13 a) were taken as the research object, and the current year of cultivated land was taken as the control. Spatial\|temporal substitution method and path analysis method were used to study the physical and chemical properties, changes in soil enzyme activity, and the correlation among them. The results showed that: (1) the available potassium content in the soil showed a slow rising trend with increasing the number of years of conversion, reaching a peak value of 411 mg·kg-1 at 13 a. The remaining physical and chemical indexes were all reduced to the lowest when the cultivated land was converted after 13 a, namely sand content of 59%, soil bulk density of 1.285 g·cm-3, soil organic matter content of 7.9 g·kg-1, soil total nitrogen content of 0.1 g·kg-1, and quick\|available phosphorus content of 0.329 mg·kg-1. From the depth of soil layer, it can be seen that the soil moisture content and soil bulk density were consistent, which were both higher in the deep layer than in the surface layer, while the sand content, orgainc matter, available potassium, total\|nitrogen and available phosphorus were higher in the surface layer than in the deep layer. (2) The four soil enzyme activities showed a fluctuating trend of increasing first and then decreasing with increasing the years of returning farming. Except for the overall high level of catalase activity, the other soil enzyme activities were larger in the surface layer than in the deep layer with significant differences (P<0.05). The catalase activity value was as high as 0.828 mL·g-1·20 min-1, and the phosphatase activity value was as low as 0.0036 mg·g-1·d-1. (3) The correlation coefficients of phosphatase, urease activities, and available potassium contents in reclaimed land reached 0.949 and 0.966, respectively, showing extremely significant negative correlation (P<0.01). (4) Path analysis showed that available potassium content in surface layer (0~20 cm) was the direct main factor affecting the activities of phosphatase and sucrase, while organic matter content indirectly affected the enzyme activities of four soil types. Soil organic matter content in deep layer (20~40 cm) was the main factor directly affecting phosphatase activity and catalase activity, while total nitrogen content indirectly affected 4 soil enzyme activities. |
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