| Soil dissolved organic nitrogen and enzyme activities at different desertification grasslands in Northwest Sichuan |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2018.01.10 |
| Key Words: grasslands in northwest Sichuan desertification dissolved organic nitrogen soil enzyme |
| Author Name | Affiliation | | SHU Xiang-yang | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | HU Yu-fu | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | YANG Yu-shan | College of Management, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | HE Jia | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | SHE Shu-feng | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | JIA An-du | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | JIANG Zheng-bo | College of Resources, Sichuan Agricultural University, Chengdu, Sichuan 611130, China | | SUN Jin-yang | College of Management, Sichuan Agricultural University, Chengdu, Sichuan 611130, China |
|
| Hits: 1487 |
| Download times: 725 |
| Abstract: |
| In order to explore the changes of soil dissolved organic nitrogen and enzyme activities in the process of the alpine desertification grassland in Northwest Sichuan, we studied the dissolved organic nitrogen and the vertical distribution characteristics of urease, protease, nitrate reductase and arginine deaminase. The results showed that with the aggravation of desertification, all enzyme activities decreased sharply. Compared with the non-desertification grassland, the activities of urease, protease, nitrate reductase and arginine deaminase of the grassland were decreased by 40.54%, 30.68%、39.85% and 44.00% at 0～20 cm soil depth, respectively. With the increase of the degree of desertification, soil dissolved organic nitrogen showed a declining trend. Compared with the non-desertification grassland, the soil dissolved organic nitrogen concentrations of light desertification grassland, middle desertification grassland, serious desertification grassland were decreased by 22.36%, 48.72% and 67.77% respectively, especially at the 0～20 cm soil layer. Correlation analysis showed a significant positive correlation between soil enzyme activity and soil nitrogen. |
|
|
|