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Changes in soil nutrients and the plant communitywith different stocking rates on steppe after rest grazing

机译：放牧后草原不同放牧量下土壤养分和植物群落的变化

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摘要

Inner Mongolia Steppe, an important part of Eurasia Steppe, is not only the foundation of regional development, but also the important environmental barrier. According to the correlativity between soil nutrients and plant community, the paper studies the properties of soil nutrients and plant community during rest grazing. The results indicate: After 4-year rest grazing, as the conditions of maintaining the evenness of spatial pattern of soil nutrients and vegetation disappeared, the spatial heterogeneity of soil nutrients increased, and the ratio of random factors went up. Spatial heterogeneity of soil organic C, total N, inorganic N, available P and S is the largest for 0.00sheep/hm2, and the smallest for 4.00sheep/hm2. Biomass and coverage of plant community increased after 4-year rest grazing, but no significance for plant community coverage (P>0.05), there was significant difference (P<0.05) for plant community biomass compared with 1998 (except 0.00sheep/hm2). Compared with 1.33sheep/hm2, 4.00sheep/hm2 and 6.67sheep/hm2, preponderant plants of 0.00sheep/hm2 have a diversified trend. Bushiness of plant community was correlated with stocking rate and succession sequence, the smaller the stocking rate and the longer the succession sequence, the more significant the bushiness. After 4-year rest grazing, annual plants, Leymus chinensis, Stipa krylovii, Kochia prostrate, Artemisia frigida (except 6.67 sheep/hm2) and Melissitus ruthenica (except 0.00sheep/hm2) increased, but Potentilla acaulis decreased. Diversity indices and evenness indices of plant species declined during rest grazing, which means that species diversity increased and evenness declined. Biomass, height, coverage and diversity of plant community have positive correlations with soil nutrients distribution, but only significant between biomass, height and soil organic C, total N, inorganic N, available P and S (PO.05). In Inner Mongolia Steppe, because of the comprehensive effects of plant properties, soil pH, organic carbon, total N, inorganic N and N mineralisation of different plant population patches have different variations. Soil pH and total nitrogen content of Leymus chinensis patch is the highest of different plant population patches, and then Potentilla acaulis patch, Caragana microphylla patch is the lowest. Except between Artemisia frigida and Kochia prostrata patches, there are significant differences (P<0.05) between other plant population patches. Soil inorganic nitrogen content of Leymus chinensis patch is the highest, and then Artemisia frigida, Caragana microphylla, Kochia prostrata and Potentilla acaulis patches respectively. Soil inorganic nitrogen content has significant differences (P<0.05) between all the different plant population patches. Soil microbial biomass nitrogen of Caragana microphylla patch is the highest, and then Leymus chinensis, Artemisia frigida, Kochia prostrata and Potentilla acaulis patches respectively. Soil microbial biomass nitrogen has significant differences (P<0.05) between all the different plant population patches. Soil net N mineralisation rate of Leymus chinensis patch is the highest of different plant population patches, and then Artemisia frigida, Potentilla acaulis, Kochia prostrata and Caragana microphylla patches respectively, and there are significant differences (P<0.05) between all the different plant population patches. There are significant (P<0.05) positive correlativity between soil net N mineralisation rate and soil pH and temperature, and significant (P<0.05) negative correlativity between soil net N mineralisation rate and soil C.N. Soil organic carbon content of Caragana microphylla patch is the highest, and then Leymus chinensis patch, and Potentilla acaulis patch is the lowest. Except between Artemisia frigida and Kochia prostrata patches, there are significant differences (P<0.05) for soil organic carbon between other plant population patches.
机译：内蒙古草原是欧亚大陆草原的重要组成部分，不仅是区域发展的基础，还是重要的环境屏障。根据土壤养分与植物群落之间的相关性，研究了休息放牧期间土壤养分与植物群落的特性。结果表明：经过4年的休息放牧，随着维持土壤养分和植被空间格局均匀性的条件消失，土壤养分的空间异质性增加，随机因子的比例增加。土壤有机碳，总氮，无机氮，有效磷和硫的空间异质性最大，为0.00sheep / hm2，最小为4.00sheep / hm2。 4年静息放牧后植物群落的生物量和覆盖率增加，但对植物群落覆盖率无显着影响（P> 0.05），与1998年相比，植物群落生物量有显着差异（P <0.05）（除0.00sheep / hm2）。 。与1.33绵羊/hm2、4.00绵羊/ hm2和6.67绵羊/ hm2相比，0.00绵羊/ hm2的优势植物具有多样化的趋势。植物群落的丛生性与放养率和演替顺序相关，放养率越小且演替序列越长，丛生性越显着。经过4年的休息放牧后，一年生植物，羊草，针茅针茅，地肤，苦蒿，冷蒿（6.67羊/ hm2除外）和黑麦草（0.00sheep / hm2除外）都增加了，但是委陵菜却减少了。静息放牧期间植物物种的多样性指数和均匀度指数下降，这意味着物种多样性增加而均匀度下降。植物群落的生物量，高度，覆盖度和多样性与土壤养分分布呈正相关，但仅在生物量，高度和土壤有机碳，总氮，无机氮，有效磷和硫之间具有显着相关性（PO.05）。在内蒙古草原，由于植物特性的综合影响，不同植物种群斑块的土壤pH，有机碳，总氮，无机氮和氮矿化度都有不同的变化。羊草斑块的土壤pH和总氮含量最高，其次是不同植物种群的斑块，其次是小委陵菜，小叶锦鸡儿的斑块最低。除冷蒿和地肤裂片之间，其他植物种群的贴片之间存在显着差异（P <0.05）。羊草斑块的土壤无机氮含量最高，其次是冷蒿，小叶锦鸡儿，地肤和灰委陵菜。在所有不同的植物种群斑块之间，土壤无机氮含量具有显着差异（P <0.05）。小叶锦鸡儿的土壤微生物生物量氮最高，其次是羊草，冷蒿，地肤和千叶委陵菜。在所有不同的植物种群斑块之间，土壤微生物生物量氮具有显着差异（P <0.05）。羊草斑块的土壤净氮矿化率以不同植物种群斑块最高，其次为冷蒿，委陵菜，地肤和小叶锦鸡儿斑块，不同植物种群间差异有统计学意义（P <0.05）。补丁。土壤净氮矿化率与土壤pH和温度呈显着正相关（P <0.05），土壤净氮矿化率与土壤C.N呈显着（P <0.05）负相关。小叶锦鸡儿斑块的土壤有机碳含量最高，其次是羊草斑块和红委陵菜斑块的最低。除苦蒿和地肤之间，其他植物种群之间的土壤有机碳差异显着（P <0.05）。

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