| Woodland soil nutrient changes and correlation analysis of different fixed numbers of abandoned lands in Minqin oasis |
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| DOI：10.7606/j.issn.1000-7601.2016.02.19 |
| Key Words: abandoned crop land soil nutrition correlation the lower reaches of Shiyang River |
| Author Name | Affiliation | | WANG Fang-lin | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
State Key Laboratory of Desertification Combating prevention and Sandstorm Disaster of Gansu Province & Gansu Desert Control Research Institute, Wuwei, Gansu 733000, China | | WEI Xiao-hong | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WANG Li-de | State Key Laboratory of Desertification Combating prevention and Sandstorm Disaster of Gansu Province & Gansu Desert Control Research Institute, Wuwei, Gansu 733000, China | | CHAI Cheng-wu | State Key Laboratory of Desertification Combating prevention and Sandstorm Disaster of Gansu Province & Gansu Desert Control Research Institute, Wuwei, Gansu 733000, China | | HAN Fu-gui | State Key Laboratory of Desertification Combating prevention and Sandstorm Disaster of Gansu Province & Gansu Desert Control Research Institute, Wuwei, Gansu 733000, China | | ZHANG Ying-hua | State Key Laboratory of Desertification Combating prevention and Sandstorm Disaster of Gansu Province & Gansu Desert Control Research Institute, Wuwei, Gansu 733000, China | | WEI Lin-yuan | State Key Laboratory of Desertification Combating prevention and Sandstorm Disaster of Gansu Province & Gansu Desert Control Research Institute, Wuwei, Gansu 733000, China | | GUO Chun-xiu | State Key Laboratory of Desertification Combating prevention and Sandstorm Disaster of Gansu Province & Gansu Desert Control Research Institute, Wuwei, Gansu 733000, China |
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| Abstract: |
| The typical region of Shiyang River in Minqin cultivated land was selected to analyze different restorations of soil distribution, changes of soil nutrient and community structure of recovery process in vegetation land of Shiyang River, and their correlations were also investigated. The results showed that N fertilizer had a fluctuant trend to become increased in farmland soil. However, during the same period, it was gradually decreased with the increase of soil depth. 1～10 a after abandonment, N level showed small variations, whereas 15～30 a after abandonment, the variations became large. It went stabilized after 50 a. Additionally, levels of P content in soil depths followed the order as the follow: A (0～10 cm)＞B(10～20 cm)＞C(20～30 cm)＞D(30～40 cm). 1～10 a after abandonment, P level difference between A and B layers varied largely. However, it in C and D layers were affected subtly by the time of abandonment. During 15～50 a, P levels in A, B, C and D layers showed small variations. K level exhibited similar variation trends as P level. Organic matter content varied largely during 1～7 a after abandonment, whereas it varied little during 10～50 a. During 1～5 a, it became decreased with the increase of soil depths in A, B, C and D layers. During 7～50 a, it resulted in large change in A layer, while it reached stabilization in B, C and D layers. In addition, the correlation analysis about nutrients showed that the 1a after abandonment, contents of available phosphorous and organic matters were significantly negatively correlated with the time. During 5～10 a, all nutrients were positively correlated with the time at an insignificant level. Between 15～20 a, significant differences were found between all nutrients and the time. During 30～50 a, available potassium, available phosphorous, and contents of organic matters did not have a significant deviation from the time, while in 50 a, they did. |
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