| Impact of traditional cropland conversion to Lycium barbarum plantations on soil quality: a case study in the major production region of Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2025.06.23 |
| Key Words: Lycium barbarum agricultural land use type soil physicochemical properties soil quality index |
| Author Name | Affiliation | | GUO Hao | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Qiang | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | TIAN Ruibin | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WU Pei | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | FAN Xinyao | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SUN Likun | College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LU Yongli | College of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To investigate the effects of traditional cropland conversion to wolfberry (Lycium barbarum) orchards on soil quality in the arid and semi\|arid regions of Northwest China, this study selected Wuhe Town in Jingyuan County, Gansu Province, as the study area. Soil samples (0 ~ 20 cm depth) were collected from cropland (n=18) and wolfberry orchards (n=28), and 14 physicochemical properties were analyzed. A minimum dataset (MDS) was constructed using principal component analysis, and the soil quality index (SQI) was calculated. Additionally, a soil obstacle factor model was applied to diagnose key limiting factors for soil quality improvement. The results showed that compared to cropland, wolfberry orchards exhibited an 8.9% increase in bulk density, along with 15.7% and 22.5% reductions in total porosity and field capacity, respectively. Chemically, available phosphorus (45.4 mg·kg-1) and available potassium (382.84 mg·kg-1) accumulated substantially, while alkaline hydrolysis nitrogen (33.77 mg·kg-1) was deficient. The electrical conductivity (229.21 μS·cm-1) increased significantly, indicating heightened salinization risk. The SQI based on MDS revealed that orchard soil quality (0.489) was significantly lower than that of cropland (0.531), with physical structure degradation identified as the primary limiting factor. Consequently, prolonged overuse of chemical fertilizers and frequent human activities result in soil physical structure degradation, surface layer salt accumulation, and diminished soil quality. |
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