| Effects of different management modes on soil aggregate stability and physicochemical properties of grassland in arid area |
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| DOI：10.7606/j.issn.1000-7601.2018.04.03 |
| Key Words: grassland management modes aggregate particle organic matter content physico chemical properties |
| Author Name | Affiliation | | JIANG La-mei | College of Resource and Environment Science, Xinjiang University, Urumqi, Xinjiang 830046
Key Laboratory of Oasis and Ecology, Xinjiang University, Urumqi， Xinjiang 830046 | | Bai Gui-fen | Fuyun Grassland Station, Fuyun, Xinjiang 836109 | | LU Guang-hui | Key Laboratory of Oasis and Ecology, Xinjiang University, Urumqi， Xinjiang 830046
Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, Xinjiang 830046 | | Yang Jian-jun | College of Resource and Environment Science, Xinjiang University, Urumqi, Xinjiang 830046
Key Laboratory of Oasis and Ecology, Xinjiang University, Urumqi， Xinjiang 830046
Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, Xinjiang 830046 | | He Xue-min | Key Laboratory of Oasis and Ecology, Xinjiang University, Urumqi， Xinjiang 830046
Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, Xinjiang 830046 | | Liu Zhi-dong | College of Resource and Environment Science, Xinjiang University, Urumqi, Xinjiang 830046
Key Laboratory of Oasis and Ecology, Xinjiang University, Urumqi， Xinjiang 830046 | | Cai Yan | College of Resource and Environment Science, Xinjiang University, Urumqi, Xinjiang 830046
Key Laboratory of Oasis and Ecology, Xinjiang University, Urumqi， Xinjiang 830046 |
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| Abstract: |
| The soil aggregate has great influence on soil fertility, quality and its sustainable utilization, which is the basis for water and fertilizer’s storage and release. Particle size grouping and physicochemical properties were investigated in five kinds of grassland soil in Altay Prefecture, including artificial grassland, banning grazing grassland, seasonal grassland, abandoned grassland and natural grassland, by wet sieve method. The results are: The organic matter content ranged from 10.623 g·kg-1 in artificial grassland to 16.337 g·kg-1 in natural grassland. The organic content of natural grassland is significantly higher than that of grasslands (P<0.05). The order from high to low of soil macro aggregates content was: ungrazed grassland (29.83%) > natural grassland (25.33%) > season grassland (21.47%) > abandoned grassland (19.28%) > artificial Grassland (9.96%). MWD (mean weight diameter) of soil water stable aggregates have similar variation trend in the 0-50cm soil layers for the five management modes of grasslands. GMD (geometric mean diameter) and MWD values of aggregates in banning grazing grassland were significantly higher than those of grassland under other management patterns, with the artificial grassland having the lowest MWD and GMD. The content of macro aggregates is positively correlated with soil’s SOC, MWD and GMD, correlation coefficient was 0.402, 0.931 and 0.945 respectively. In contrast, the micro aggregates content have a highly significant negative correlation with soil SOC, MWD and GMD, and correlation coefficient was -0.383, -0.784 and -0.779 respectively. No significant correlation was detected between soil available phosphorus and MWD, GMD, SOC, different aggregate particle fractions. Comparison of several management modes, aggregate content of banning grazing grassland is 1.01 times of natural grassland, compared with the natural grassland. It indicated that the formation and stability of soil aggregates benefited by banning grazing management. The artificial grassland’s aggregates content was only 0.39 times of that of natural grassland, indicating that human disturbance destroyed the stability of soil aggregate. |
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