【作者】 赵方莹；

【导师】 周心澄；

【作者基本信息】 北京林业大学 ， 工程绿化， 2008， 博士

【摘要】 北京铁矿开采形成的废弃地水土流失严重、生态系统退化,直接影响了矿山及周边居民的生产生活,严重制约了区域经济可持续发展,对铁矿废弃地进行植被恢复是首都生态涵养发展带生态环境建设的迫切需要。通过对具有典型代表性的北京首云铁矿的地形、地貌、植被、土壤等进行调查,采用空间代替时间的方法,对矿山废弃地的植被、土壤理化性质及植被恢复生态效应进行分析,了解矿山废弃地植被恢复的演替动态,研究适宜土壤改良和乡土植物品种选配技术,结果表明:(1)在尾矿砂阳坡缓坡、碎石夹微土阳坡缓坡、土石混合物阳坡缓坡覆盖10cm山皮土结合栽种适生植物,在裂隙裸岩及风化物阳坡陡坡采用合理配置基质和植物种子进行挂网喷播,使得各立地类型土壤结构和土壤肥力状况均有不同程度的改善。随着植物生长对土壤肥力的消耗,需要结合适当的培肥措施促进植被恢复。(2)土壤种子库特征分析表明,尾矿砂阳坡缓坡和碎石夹微土阳坡缓坡土壤种子库植物种类均较少,均为草本植物,且地上植被与土壤种子库之间差异较大。(3)不同立地类型矿山废弃地的人工恢复植被主要包含禾本科、豆科和菊科,一二年生草本植物所占比例较大。碎石夹微土阳坡缓坡自然恢复20年内,由优势种不明显的灌草群落演替为以荆条为优势种的灌草群落。裂隙裸岩及风化物阳坡陡坡自然恢复10年和自然恢复20年群落,喜阳、耐旱的乔木是群落中优势物种。自然恢复30年群落,荆条为群落优势物种。土石混合物阳坡缓坡自然定居的植物中草本植物较多。(4)尾矿砂阳坡缓坡人工恢复1年植物群落与棕壤阳坡缓坡植物群落物种丰富度差异显著,人工恢复3年植物群落与棕壤阳坡缓坡植物群落物种丰富度差异极显著,人工恢复4年植物群落与棕壤阳坡缓坡植物群落Simpson多样性指数差异显著。以棕壤阳坡缓坡植物群落为参照,尾矿砂阳坡缓坡植物群落β多样性指数大小顺序为:人工恢复4年＞人工恢复3年＞人工恢复1年＞人工恢复10年。人工植被恢复10年内7个主要物种分组结果为:波斯菊、稗草2个物种为衰退种组;沙打旺为过渡种组;黄花蒿、狗尾草、紫穗槐、荆条4个物种为进展种组。碎石夹微土阳坡缓坡自然恢复和人工恢复植物群落物种丰富度指数随恢复时间增加而减小,其它3个多样性指数随恢复时间增加而增加。以棕壤阳坡缓坡植物群落为参照,碎石夹微土阳坡缓坡植物群落β多样性指数大小顺序为:人工恢复1年＞自然恢复10年＞人工恢复2年＞自然恢复20年。人工和自然植被恢复20年内8个主要物种分组结果为:波斯菊、苋草、猪毛蒿3个物种为衰退种组;紫花苜蓿、稗草、狗尾草、籽蒿4个物种为过渡种组;荆条为进展种组。裂隙裸岩及风化物阳坡陡坡自然恢复群落α多样性随恢复时间增加而呈波动变化。人工恢复植被的多项多样性指数均明显高于棕壤阳坡缓坡植物群落多样性水平。以棕壤阳坡缓坡植物群落为参照,裂隙裸岩及风化物阳坡陡坡植物群落β多样性指数大小顺序为:自然恢复10年＞人工恢复2年＞自然恢复20年＞自然恢复30年。人工和自然植被恢复30年内11种主要物种分组结果为:马唐、苋草、籽蒿、狗尾草、苍耳5个物种为衰退种组;白蒿、青杨2个物种为过渡种组;臭椿、猪毛蒿、榆树、荆条4个物种为进展种组。土石混合物阳坡缓坡植物群落α多样性明显高于棕壤阳坡缓坡植物群落多样性。以棕壤阳坡缓坡植物群落为参照,土石混合物阳坡缓坡β多样性指数大小顺序为:人工恢复2年＞自然恢复10年＞人工恢复1年。人工和自然植被恢复10年内7种主要物种分组结果为:狗尾草、紫花苜蓿2个物种划为衰退种组;铁杆蒿划为过渡种组;荆条、侧柏、藜、油松4个物种划为进展种组。(5)根据TWINSPAN对矿山废弃地自然和人工植物群落类型进行划分结果分析其生态效应:自然恢复群落与棕壤阳坡缓坡植物群落相似性大小顺序为臭椿群落＞荆条-狐尾草群落＞榆树-白蒿群落＞狗尾草-籽蒿群落＞苋草-灰绿藜群落。苋草-灰绿藜群落土壤容重和pH值最小、狗尾草-籽蒿群落土壤有机质、全氮和速效钾最大、榆树-白蒿群落土壤速效磷最大。人工恢复群落与棕壤阳坡缓坡植物群落相似性大小顺序为狗尾草-臭椿群落＞紫穗槐-锦鸡儿＞紫花苜蓿-刺槐群落＞波斯菊-狼尾草群落＞沙打旺群落＞黑麦草-萱草群落。更多还原

【Abstract】 The wastelands formed by iron ore mining have caused serious soil erosion and ecosystem degradation in Beijing, which directly impact the production and living conditions of residents around mining areas as well as regional economic sustainable development. So the revegetation on iron ore wastelands is of great significance for the ecological environment requirements of the belt named ecological conservation and development of capital..Through the investigation of terrain, landforms, vegetation, soil and so on in typical representative Shou Yun iron ore in Beijing, the vegetation, soil characteristics and the revegetation ecological effect were analyzed. By using the space-time method the succession dynamics of vegetation restoration was found. The techniques suitable for soil improvement and native plant species matching were study. The main results are as follows:(1) The mine tailing on gentle sunny slope, gravel with little soil on gentle sunny slope and earth-rock on gentle sunny slope can be covered with 10cm soil, planted with right plants and fertilized and the bare rock fissure with regolith on steep sunny slope can be restored accelerated by rational allocating matrix with plant seeds, so as to improve the soil structure and fertility status with different degree. It is necessary to build up soil fertility continuously for consumed soil nutrients with plant growing.(2) The characteristics analysis of mine tailing and gravel with little soil on gentle sunny slope showed that the seeds were less and belonged to the herb. There was great different between the seed bank and the aboveground vegetation.(3) The revegetation composition of different restoration measures of mine tailing mainly includes Gramineae, Leguminosae, and Compositae. The annual and biennial herb has a large proportion. During 20 years of natural restoration for gravel with little soil on gentle slope, the plant community was transformed from shrub-grass community without obvious dominant species to the shrub-grass community dominated by Vitex negundo. The heliophilous and drought tolerant tree population is the dominant species for the 10-year and 20- year plant communities of natural restoration. The 30-year natural restoration community is mainly consisted by shrub community dominated by Vitex negundo. For earth-rock on gentle sunny slope the herb is dominant among the natural settlement plants.(4) There was significant difference of species richness between 1-year artificial restoration and natural plant communities. There was extremely significant difference of species richness between 3-year artificial restoration and natural plant communities. The Simpson diversity index was significant difference between 4-year artificial restoration and natural plant communities. In reference to the plant community of burozem on gentle sunny slope, theβdiversity index of plant community for mine tailing on gentle sunny slope is in the order of 4-year artificial restoration > 3-year artificial restoration > 1-year artificial restoration > 10-year artificial restoration. The 7 species grouping result of 10-year artificial vegetation restoration is: Cosmos bipinnatus and Echinochloa crusgalli are degenerative species group; Astragalus adsurgens is transitional species; Artemisia annua, Setaria viridis, Amorpha fruticosa and Vitex negundo are progressing species group.For gravel with little soil on gentle sunny slope the species richness of natural and artificial vegetation restoration decreased with time, while the other three diversity indexes were increased with time. In reference to the plant community of burozem on gentle sunny slope, theβdiversity index of plant community for gravel with little soil on gentle sunny slope is in the order of: 1-year artificial restoration > 10-year natural restoration >2-year artificial restoration >20-year natural restoration. The 8 species grouping result of 20-year artificial and natural vegetation restoration is: Cosmos bipinnatus , Amaranthus mangostanus and Artemisia scoparia are degenerative species group; Medicago sativa, Echinochloa crusgalli, Setaria viridis and Artemisia sphaerocephala are transitional species; Vitex negundo is progressing species group.For bare rock fissure with regolith on steep sunny slope the a diversity index of natural vegetation restoration fluctuated in process of time. The diversity index of artificial vegetation restoration is apparently higher than that of plant community in burozem on gentle sunny slope. In reference to the plant community of burozem on gentle sunny slope, theβdiversity index of bare rock fissure with regolith on steep sunny slope is in the order of: 10-year natural restoration> 2-year artificial restoration> 20-year natural restoration> 30-year of natural restoration. The 11 species grouping result of 30-year artificial and natural vegetation restoration is: Digitaria sanguinalis , Amaranthus mangostanus, Artemisia sphaerocephala, Setaria viridis and Xanthium sibiricum are degenerative species group; Arteimiaisia sieuersiana and P.cathayana are transitional species; Ailanthus altissima, Artemisia scoparia, Ulmus pumila, Vitex negundo are progressing species group.For earth-rock on gentle sunny slope the a diversity index is apparently higher than that of natural plant community. In reference to the plant community of burozem on gentle sunny slope, theβdiversity index of earth-rock on gentle sunny slope is in the order of: 2-year artificial restoration> 10-year natural restoration > 1-year artificial restoration. The 7 species grouping result of 10-year artificial and natural vegetation restoration is: Setaria viridis and Medicago sativa are degenerative species group; Artemisia sacrorum is transitional species; Vitex negundo, Platycladus orientalis, Chenopodium album and Pinus tabulaeformis are progressing species group.(5) According to the partition result of natural and artificial plant community with TWINSPAN the ecological effects were analyzed. The similarity order between natural restoration communities and natural plant communities is: Ailanthus altissima community> Vitex negundo -Alopecurus pratensis community> Ulmus pumila- Arteimiaisia sieuersiana community > Setaria viridis-Artemisia sphaerocephala community>Amaranthus mangostanus-Chenopodium glaucum community. The soil bulk density and pH value of Amaranthus mangostanus- Chenopodium glaucum community are minimum,The soil organic matter, nitrogen and potassium of Setaria viridis-Artemisia sphaerocephala community are largest.The soil available phosphorus of Ulmus pumila- Arteimiaisia sieuersiana community is largest.The similarity order between artificial restoration community and natural plant community is: Setaria viridis-Ailanthus altissima community>Amorpha fruticosa-Caragana sinica community>Medicago sativa-Robinia pseudoacacia community>Cosmos bipinnatus-Pennisetum alopecuroides community>Astragalus adsurgens community> Lolium perenne-Hemerocallis fulva community.更多还原