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- Title
围封和施肥对高寒草甸群落特征和植被碳氮库的影响.
- Authors
秦瑞敏; 程思佳; 马丽; 张中华; 魏晶晶; 苏洪烨; 史正晨; 常涛; 胡雪; 阿的哈则; 袁访; 李珊; 周华坤
- Abstract
The objective of this study was to determine how two different restoration measures, i. e., grazing exclusion and fertilization, affect degraded alpine meadows. A field study was conducted to compare the effects of grazing exclusion for various periods (0,4,13 yrs) and long-term fertilization (with nitrogen, N, and phosphorus, P) on community characteristics and vegetation carbon (C) and N pools. The results showed that: 1) The species richness index and Shannon-Wiener index decreased significantly with increasing years of grazing exclusion, while Simpson’s index and the Pielou index increased and then decreased. The addition of N and P fertilizers significantly decreased the species richness index and Shannon-Wiener index. 2) Aboveground biomass and root biomass were significantly increased after both 4 and 13 years of grazing exclusion, reaching the maximum at 4 years, whereas litter biomass increased gradually with increasing years of grazing exclusion. The effect of long-term fertilization on biomass was not significant. 3) After grazing exclusion, vegetation C and N stocks increased significantly, with aboveground biomass and root C and N pools being highest at 4 years of grazing exclusion, and litter C and N pools being highest at 13 years of grazing exclusion. Long-term fertilization had no significant effect on vegetation C stocks, and only long-term N addition significantly increased the aboveground biomass N pools. 4) Partial least squares path modeling showed that grazing exclusion and fertilization led to changes in environmental factors that restrained community diversity and promoted the accumulation of plant biomass and vegetation C pools, while fertilization affected vegetation N pools. In summary, grazing exclusion generally restrained species diversity, but promoted community productivity and increased vegetation C and N pools, while long-term N addition had no significant positive effect on species diversity and vegetation C pools, but increased vegetation N pools.
- Publication
Acta Prataculturae Sinica, 2024, Vol 33, Issue 4, p1
- ISSN
1004-5759
- Publication type
Article
- DOI
10.11686/cyxb2023198