本文選題：短花針茅 + 種群年齡　； 參考：《生態(tài)環(huán)境學報》2017年06期

【摘要】：以內(nèi)蒙古農(nóng)業(yè)大學蘇尼特右旗荒漠草原的放牧調(diào)控實驗為平臺,通過分析荒漠草原建群種種群結(jié)構(gòu)及土壤團聚體特征,揭示放牧調(diào)控下荒漠草原短花針茅(Stipa breviflora)與沉積土壤的潛在聯(lián)系。結(jié)果顯示:(1)短花針茅幼齡與成年植株密度顯著大于幼苗、老齡前期、老齡期密度;各年齡短花針茅種群密度、生物量均呈現(xiàn)重度放牧處理最高、適度放牧次之、重度放牧最低的規(guī)律;(2)短花針茅荒漠草原土壤團聚體分布受團聚體粒徑及其與放牧強度的交互作用影響(P0.05);同一放牧處理中,100~250μm植物沉積團聚體含量最高,50μm與50~100μm團聚體含量次之、500μm團聚體含量最小;而裸地土壤團聚體以50μm團聚體含量最高;(3)50μm裸地土壤團聚體含量與50μm植物沉積土壤團聚體含量呈正相關(P0.05),而50μm植物沉積土壤團聚體含量與各年齡短花針茅種群密度、生物量呈負相關,各100μm植物沉積土壤團聚體含量與各年齡短花針茅種群密度、生物量呈正相關。研究認為,放牧降低了各年齡短花針茅種群密度和生物量,削弱了荒漠草地抵抗風蝕和沉降風沙的能力,降低了短花針茅改善基部土壤結(jié)構(gòu)的生態(tài)功能,這可能是放牧草地退化過程的重要機制之一。
[Abstract]:Based on the experiment of grazing control in the desert steppe of Sunita Youqi of Inner Mongolia Agricultural University, this paper analyzes the structure of various groups and the characteristics of soil aggregates in the desert steppe.The potential relationship between Stipa breviflora (Stipa breviflora) and sedimentary soil under grazing control was revealed.The results showed that the density of young and adult plants was significantly higher than that of seedlings, the density of young and adult plants was significantly higher than that of seedlings, and the population density and biomass of Stipa breviflora at different ages were the highest under heavy grazing, followed by moderate grazing.The distribution of soil aggregates in Stipa breviflora desert steppe was affected by the particle size of aggregates and their interaction with grazing intensity (P0.05), and the highest concentration of plant sediment aggregates was 50 渭 m and 50 ~ 100 渭 m in the same grazing treatment.The content of aggregates was the lowest at 500 渭 m.However, there was a positive correlation between 50 渭 m soil aggregate content and 50 渭 m plant sedimentary soil aggregate content, while the 50 渭 m plant sedimentary soil aggregate content was positively correlated with the population density of Stipa breviflora.Biomass was negatively correlated, and the aggregate content of 100 渭 m plant sediment soil was positively correlated with the population density and biomass of Stipa breviflora.The results showed that grazing decreased the population density and biomass of Stipa breviflora at different ages, weakened the ability of desert grassland to resist wind erosion and sedimentation, and reduced the ecological function of Stipa breviflora to improve the soil structure at base.This may be one of the important mechanisms in the process of grassland degradation.
【作者單位】： 內(nèi)蒙古農(nóng)業(yè)大學草原與資源環(huán)境學院;內(nèi)蒙古農(nóng)業(yè)大學理學院;
【基金】：國家自然科學基金項目(31460126) 國家重點基礎研究發(fā)展計劃項目(2014CB138805)
【分類號】：S812

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本文編號：1738603