| Study on the multifunctionality and species diversity of grassland ecosystem under different land-uses |
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| DOI：10.7606/j.issn.1000-7601.2019.05.30 |
| Key Words: grassland ecosystem ecosystem multifunctionality species diversity quantization method |
| Author Name | Affiliation | | CAI Yan | College of Resources and Environment Science, Xinjiang University, Urumqi, Xinjiang 830046, China
Key Laboratory of Oasis and Ecology, Xinjiang University, Urumqi,Xinjiang 830046, China | | LU Guang-hui | Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, Xinjiang 830046, China
Key Laboratory of Oasis and Ecology, Xinjiang University, Urumqi,Xinjiang 830046, China | | HE Xue-min | Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, Xinjiang 830046, China
Key Laboratory of Oasis and Ecology, Xinjiang University, Urumqi,Xinjiang 830046, China | | JIANG La-mei | Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, Xinjiang 830046, China
Key Laboratory of Oasis and Ecology, Xinjiang University, Urumqi,Xinjiang 830046, China | | WANG Heng-fang | Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, Xinjiang 830046, China
Key Laboratory of Oasis and Ecology, Xinjiang University, Urumqi,Xinjiang 830046, China | | TENG De-xiong | Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, Xinjiang 830046, China
Key Laboratory of Oasis and Ecology, Xinjiang University, Urumqi,Xinjiang 830046, China |
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| Abstract: |
| We assessed the multifunctionality of grassland under non-grazing grassland, seasonal grazing grassland, farming abandoned grazing grassland, and natural grazing grassland in Altay using the multifunctionality index calculated by the mean value method, and discussed the relationship between the ecosystem multifunctionality and species diversity.The results showed that, the multifunctionality index resulted with the mean value method was highly correlated with that calculated by the current mainstream methods both in quadrat (R2=0.950, P<0.05) and plot scale (R2=0.909, P<0.01). Conversion of farmland to grazing grassland had the lowest species diversity (0.219), and most of the soil functional indices were poor showing a degradation characteristics (-0.241), which was also presented in natural grazing grassland (-0.406); the spring/autumn seasonal grazing grassland had a higher species diversity (0.910) and better soil functional performance (0.343). The multifunctionality index of four grassland communities was in order of spring/autumn seasonal grazing grassland(0.343) >non-grazing grassland(0.222) >grazing grassland converted from farmland > (-0.241) > natural grazing grassland (-0.406). Plants were distributed along the water and nutrient gradient. Among the biodiversity indices,Margelf index and Pielou index were most strongly correlated with the multifunctionality,their explanatory power for multifunctionality index was higher at quadrat scale (R2=0.980, P<0.05；R2=0.455, P>0.05) than at plot scale (R2=0.078, P>0.05；R2=0.116, P>0.05), but the effects of Pielou index was much smaller indicating study scale played an important role in multifunctionality. The multifunctionality was most influenced by the species abundance (R2=0.980, P=0.01), and significantly linearly correlated, whereas it was not significantly correlated with the species evenness representing an unimodal curve (P>0.05). In summary, compared with the other land-use types, the spring/autumn seasonal grazing grassland was more conducive to maintain the ecosystem multifunctionality in this region; ecosystems with high species abundance,and moderate evenness may have higher multifunctionality. |
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