| 天然草地与改良草地地上生物量空间分布及其群落结构特征 |
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| 引用本文： | 刘书娟,;陈俊,;高宁宁,;汪丽平,;王文颖,;程积民.天然草地与改良草地地上生物量空间分布及其群落结构特征[J].家畜生态,2014(6):55-59. |
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| 作者姓名： | 刘书娟 ;陈俊 ;高宁宁 ;汪丽平 ;王文颖 ;程积民 |
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| 作者单位： | [1]西北农林科技大学动物科技学院,陕西杨凌712100; [2]中国科学院水利部水土保持研究所,陕西杨凌712100 |
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| 基金项目： | 现代农业产业技术体系建设专项资金资助（CARS-35-02A） |
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| 摘 要： | 应用数理统计模型的解析方法,探讨退化天然草地和补播苜蓿的改良草地地上生物量的空间分布规律及其群落结构特征。结果表明,2种草地的主要植物种地上生物量的空间分布与γ分布模型具有很好的吻合性。改良草地的平均生物量极显著的高于天然草地（P〈0.001）,而平均物种数与平均物种多样性指数极显著的低于天然草地（P〈0.001）。2种草地的组成植物种的空间异质性指数与其平均生物量之间均存在着负相关。天然草地的生物量随着物种数的增加而增大,而改良草地随着物种数的增加,生物量逐渐减少。
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| 关 键 词： | 草地 γ分布模型 群落结构 生物量 空间分布 |
Spatial Distribution and Community Structure of Aboveground Biomass in Nature Grassland and Artificial Pasture |
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| Institution: | LIU Shu-juan;CHEN Jun;GAO Ning-ning;WANG Li-ping;WANG Wen-ying;CHENG Ji-min (1 . College of Animal Science and Technology, Northwest A ＆ F University, Yangling , Shaanxi 712100, China 2. Institute of Soil and Water Conservation ,Chinese Academy of Sciences and Ministry of Water Resource ,Yangling ,Shaanxi 712100,China) |
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| Abstract: | Through comparing the artificial reseeded alfalfa pasture and the degraded natural grassland in Binxian County, Shaanxi province, two kinds of the spatial pattern of aboveground biomass and their community structure were ascertained by analytical method of mathematical statistics model to establish a scientific theory basis for the vegetation restoration of degraded grasslands and for management of artificial grasslands in arid/semi-arid regions. The results showed that the spatial distribution of aboveground bio- mass of the main plants in the two grasslands well matched that in the gamma distribution model. The mean biomass （DM g · （0.25 m2）-1） in the improved grassland significantly surpassed that in natural grassland （P〈0.001）, while the average species richness and diversity index per quadrat were significant- ly lower than the latter （P〈0.001）. There revealed a negative correlation between the spatial heterogenei- ty index of the composition of plant species and the average biomass per quadrat in both grasslands. With the increase of species richness, the average biomass per quadrat increased in the natural grassland, but it decreased in the improved grassland. |
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| Keywords: | grassland gamma distribution model community structure biomass spatial distribution |
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