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文摘
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在内蒙古典型草原，对不同放牧率草地休牧3a后的土壤养分空间异质性和植物群落的数量变化特征进行了研究，结果表明：不同放牧率草地休牧3a后，由于维持土壤养分或植被空间格局的匀质化条件消失，土壤养分的空间异质性呈不同程度的增大趋势，随机性因素所占比例增加，其中土壤有机碳、全氮、无机氮、有效磷和有效硫的空间异质性均以0．00羊/hm^2区最大，4．00羊／hm^2区（中牧区）最小，其它样地不同土壤养分指标表现不同的变化特征；群落生物量和群落盖度均表现增加趋势，但群落盖度增加不显著（P〉0．05），与1998年相比，群落生物量除对照区外均达到了显著性差异（P〈0．05），与1．33羊／hm^2、4．00羊／hm^2和6．67羊／hm^2相比，O．00羊／hm^2优势植物出现多样化特征；群落的灌丛化与牧压和恢复演替的时间序列高度相关，牧压越小，恢复演替的时间序列越大，群落灌丛化的趋势越明显；1年生植物、羊草、克氏针茅、木地肤、冷蒿（除6．67羊／hm^2）和扁蓿豆（除O．00羊／hm^2）均表现增加趋势，星毛委陵菜则均表现降低趋势；植物群落的生物量、群落高度、群落盖度和群落物种多样性与土壤养分分布均表现一致的正相关关系，但只有植物群落生物量和群落高度与土壤有机碳、全氮、无机氮、土壤有效磷和有效硫相关显著（P〈0．05）。 |
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其他语种文摘
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The paper study on the soil spatial heterogeneity and plant community properties from different stocking-rate grasslands after 4-year rest grazing in Inner Mongolia steppe. It was indicated： as the conditions of maintaining the homogenization of spatial pattern of soil nutrients and vegetation was disappeared, the spatial heterogeneity of soil nutrients and the ratio of random factors were increased after 4-year rest grazing. The spatial heterogeneity of 0.00sheep/hm^2 block for soil organic C, total N, inorganic N, available P and S is the largest, and the smallest is 4.00sheep/hm^2 block. The other parameters were showed different diversification of soil nutrient came from different testing fields. The biomass and coverage of plant community were increased after 4-year rest grazing, but no significant different for plant community coverage （p 〉 0.05）. It was significant different on the biomass of plant community compared with in 1998（p 〈 0.05）. A diversified trend of preponderant plants for 0.00sheep/hm^2 block was existed. Thicketization of plant community was correlated with stocking rate and succession sequence of time, the smaller of stocking rate and the longer the succession sequence of time, the more significant of thicketization. The ratio of Aneurolepidium chinense , Stipa krylovii , Kochia prostrate, Artemisia frigida （ except 6.67 sheep/hm^2 ） and Melissitus ruthenica （except 0.00sheep/hm^2 ） was increased respectively, but Potentilla acaulis was decreased after 4-year rest grazing. The biomass, height, coverage and diversity of plant community were took on the positive correlations with the distribution of soil nutrients, however there was only significant different between community biomass, height of plant community and soil organic C, total N, inorganic N, available P and S （p 〈 0.05）. |
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来源
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生态学报
,2006,26(6):2048-2056 【核心库】
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关键词
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内蒙古草原
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休牧
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土壤养分
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植物群落
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空间异质性
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地址
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1.
中国科学院西北高原生物研究所, 西宁, 810008
2.
中国科院植物研究所, 中科院植被数量生态学重点实验室, 北京, 100093
3.
中国科学院研究生院, 北京, 100049
4.
中国农业大学草地研究所, 北京, 100094
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0933 |
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学科
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普通生物学;植物学 |
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基金
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国家自然科学基金
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中国科学院知识创新工程重要方向项目
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文献收藏号
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CSCD:2543126
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