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轻便浅层取样机具在大兴安岭森林植被覆盖区化探样品采集中的应用研究 被引量:7
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作者 杨汉水 苏兴涛 卢猛 《探矿工程(岩土钻掘工程)》 2017年第8期81-84,共4页
地球化学样品采集方法对覆盖区化探工作意义重大。受广泛存在的覆盖层影响,大兴安岭地区开展常规化探工作难以达到理想效果。为此开展了在大兴安岭地区利用轻便浅层取样机具进行地球化学样品采集的研究工作,得出了利用浅层取样机具采集... 地球化学样品采集方法对覆盖区化探工作意义重大。受广泛存在的覆盖层影响,大兴安岭地区开展常规化探工作难以达到理想效果。为此开展了在大兴安岭地区利用轻便浅层取样机具进行地球化学样品采集的研究工作,得出了利用浅层取样机具采集化探样品可以广泛应用于物化探异常查证,矿化体追踪,数字填图等地质工作的结论。同时,该方法对生态文明建设起到积极且重要的作用。 展开更多
关键词 轻便浅层取样机具 TGQ系列钻机 化探样品采集 大兴安岭 森林植被覆盖
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江河源区植被分区 被引量:2
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作者 温秀卿 杨改河 +1 位作者 王得祥 任广鑫 《西北农林科技大学学报(自然科学版)》 CSCD 北大核心 2004年第2期5-8,13,共5页
 按照植物群落学—生态学原则,将江河源区的天然植被划分为森林植被区、灌木与灌丛植被区、草原植被区、草甸植被区、荒漠植被区和湿地植被区6个区,并分析了各植被区的分布范围及其优势种。
关键词 江河源 植被 生态学原则 森林植被区 灌木 灌丛植被
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十八站火烧区森林植被的恢复
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作者 韩凤泉 张秀伟 《内蒙古林业调查设计》 2008年第2期30-31,33,共3页
文章介绍了十八站火烧区的行政管辖和地理位置及地形地貌、气候气象、植被与土壤、野生动物和矿产资源,火烧区的现状,火烧区森林植被恢复的意义,火烧区森林植被恢复的依据。
关键词 火烧现状 火烧森林植被恢复的意义 依据
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Modern pollen assemblages of the forest communities and their relationships with vegetation and climate in northern China 被引量:4
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作者 李月丛 许清海 +3 位作者 张丽艳 王学丽 曹现勇 阳小兰 《Journal of Geographical Sciences》 SCIE CSCD 2009年第6期643-659,共17页
53 pollen traps and surface samples were collected in order to detect the characteristics of pollen assemblages and their relationships with vegetation and climate in 16 forest communities located in 10 mountains in n... 53 pollen traps and surface samples were collected in order to detect the characteristics of pollen assemblages and their relationships with vegetation and climate in 16 forest communities located in 10 mountains in northern China. The results show that 72% of the pollen taxa (80 taxa) are the same between the traps and the surface samples. The dominant taxa in the plant communities are consistent with the main pollen taxa in the pollen assemblages at the same sites. In Pinus plant communities, both Pinus pollen influx and concentration are higher, indicating the high pollen productivity and good pollen preservation ability of Pinus. In Picea and Abies plant communities, Picea and Abies have lower pollen influxes but higher concentrations, suggesting their low pollen productivities but better pollen preservation abilities. In Betula and Quercus plant communities, Betula and Quercus have higher pollen influxes but lower concentrations, revealing their high pollen productivities but poor pollen preservation abilities. The study of relationships between pollen and vegetation with discriminant analysis shows that pollen assemblages from both trap and surface samples can reflect the characteristics of different communities and distinguish different ecological areas, but surface samples can reflect the dominant components of communities much better than the traps. The study on correlations between pollen assemblages and climate with DCCA reveals that significant correlations exist between pollen assemblages and mean temperature of the coldest month (r = 0.84 for trap samples, r = 0.72 for surface samples), and then annual mean precipitation (r = 0.73 for trap samples, r = 0.71 for surface samples). 展开更多
关键词 forest communities Tauber traps surface samples pollen assemblages pollen influx pollen concentration VEGETATION CLIMATE
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Ecological Status and Uses of Juniper Species in the Cold Desert Environment of the Lahaul Valley, North-western Himalaya, India
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作者 Yashwant S.RAWAT Colin S.EVERSON 《Journal of Mountain Science》 SCIE CSCD 2012年第5期676-686,共11页
The juniper species Juniperus polycarpos C. Koch, J. indica Bertol. and J. communis L. var. saxatilis (Pallas) are important elements of the forest vegetation in Lahaul valley in the north-western Himalaya. Their ab... The juniper species Juniperus polycarpos C. Koch, J. indica Bertol. and J. communis L. var. saxatilis (Pallas) are important elements of the forest vegetation in Lahaul valley in the north-western Himalaya. Their ability to grow under the barren and xeric conditions of cold deserts makes them particularly suited for afforestation programmes under these eeologieal conditions. In the Lahaul valley, juniper species are used as subsistence resources and for religious purposes. Excessive removal of juniper wood and leaves by the local population, overgrazing, habitat fragmentation and low regeneration potential are the main obstacles to eonservation of juniper forests in this region. The present study was carried out to assess density, basal area and importance value index (WI) of the local vegetation as well as uses and amounts of juniper wood and leaves removed from the local forests. Pressure on relict juniper forests due to grazing animals and intensive removal of wood and leaves by the loeal population was found to be greater at an altitude above 3,00o m. The results of the study demonstrated that the different juniper speeies were adapted to specific altitude ranges. A higher species density was recorded at lower altitude except for J. indica which was only present at high altitude (〉3,200 m) on south-facing slopes. Density, basal area and IVI of J. polycarpos were higher at Hinsa (2,7oo m) than at Jahlma (3,000 m). The rapid loss of vegetation due to overuse and habitat degradation has made the eonservation of juniper forests an important priority in the Lahaul valley. J. polycarpos at loweraltitude and J. indica at higher altitude are ecologically the more suitable species for the successful implementation of conservation programmes. The support of rehabilitation programmes by regional authorities is essential for the reestablishment of the local juniper forests. 展开更多
关键词 JUNIPER Distribution Utilization Pattern AGROFORESTRY FOREST CONSERVATION
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Comparison of Soil Moisture in Different Soil Layers between Three Typical Forests in the Upper Reaches of Lijiang River Basin, Southern China
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作者 LI Haifang LIU Qinghua +2 位作者 LI Shimei LI Wei YANG Jinming 《Journal of Resources and Ecology》 CSCD 2019年第3期307-314,共8页
Throughfall, stemflow, evapotranspiration and infiltration are likely to vary with forest types, and consequently affect soil moisture regimes in different soil layers. In this study, the spatial and temporal characte... Throughfall, stemflow, evapotranspiration and infiltration are likely to vary with forest types, and consequently affect soil moisture regimes in different soil layers. In this study, the spatial and temporal characteristics of soil moisture were investigated to understand variations in soil moisture in three typical forests, including Phyllostachys pubescens forest (abbreviated as PPF), Schima superba forest (abbreviated as SSF) and Cunninghamia lanceolata forest (abbreviated as CLF) in the upper reaches of Lijiang River basin in southern China. The results showed that,(1) Litterfall and soil physical properties differed significantly in the three typical forests. Infiltration capacity in SSF was more favorable to soil moisture than in PPF and CLF.(2) Large variations were found in soil moisture at different forest stands and depths. Due to complicated vertical structures, there were obvious differences in soil moisture from the 0-20 cm soil layer to the 50-80 cm soil layer.(3) Average soil moisture in each layer was higher in SSF than in PPF and CLF.(4) Soil moisture in different layers correlated closely with precipitation (P<0.01) and the three typical forests had the same change trends with rainfall during the studying period.(5) In topsoil, soil moisture was influe need by soil properties which were mostly determined by litterfall, while in deep soil, soil moisture was affected by variations of soil characteristics, which were mostly determined by root distribution. This study provides a scie ntific basis for better un dersta nding the relati on ships betwee n forest vegetati on and its hydrological effects, helping to facilitate water resources conservation and achieving wise forest management in the upper reaches of Lijiang River basin. 展开更多
关键词 soil moisture different soil layers typical forests southern China
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