Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： Forest surface combustibles are one of the important factors in forest fire propagation, and theircalorific values are an important index by which to assess combustibility. This study has aimed to assess thesurface fuels available in four typical vegetation types in the eastern Tianshan Mountains of Xinjiang, China. Thecharacteristics of the surface fuel calorific values and relationship with ignition point and absolute moisturecontent were analyzed. The results show that in coniferous and broad- leaved forests, there were significantdifferences between herb and litter components, while in shrub forest, there were significant differences betweenshrub and litter components. Within the same forest the calorific values were litter > herb > shrub > humus. Thecalorific values in the coniferous forests were the highest among the herbaceous fuel components (19.38 ± 0.08kJ·g−1), while those in the coniferous forests were highest among the litter fuel components (19.55 ± 0.05 kJ·g−1).Differences were identified in the relationship between the calorific value and the ignition point of the surfacecombustibles for the different components. There was a significant correlation between the burning point of theshrub fuel components and the calorific value (R2 = 0.81, P < 0.01), and between the burning point of litter fuelcomponents and the calorific value (R2 = 0.38, P < 0.05). However, there was no significant correlation betweenthe burning point and calorific value of the herbs and humus (P > 0.05). In addition, there was no significantcorrelation between the calorific values of the surface fuel and the absolute moisture content of all forest types.Forest type, tree species, physical and chemical properties, and other conditions were thus found to have acomprehensive effect on the calorific values of the different fuels. The results of this study provide a theoreticalbasis for forest fire management in the eastern Tianshan Mountains as they will help to accurately predict thecalorific energy and potential forest fire risks and provide data support for in-depth research on regional surfacefuels.
Subjects: Geosciences >> Geography submitted time 2020-01-06 Cooperative journals: 《干旱区地理》
Abstract：新疆荒漠地区植被覆盖度遥感估算模型十分缺乏，给荒漠化监测等相关工作带来很大不便，开展植被覆盖度遥感估算经验模型研究，对于促进和完善相关地区的生态监测及研究工作具有积极的现实意义。通过对阜康市北部沙漠南缘和克拉玛依市中部平原荒漠进行无人机航拍，利用无人机遥感提取（光合）植被信息，并将无人机航拍影像的植被覆盖度统计单元与高分辨率卫星影像像元在空间上直接相对应，获取在高分辨率卫星影像像元尺度上的植被盖度，然后通过植被覆盖度和空间上与其相对应的源自高分辨率卫星影像的NDVI数据的拟合关系，建立基于源自高分二号影像的NDVI的阜康北部沙漠植被覆盖度遥感估算线性模型以及基于源自ZY1-02C影像的NDVI的克拉玛依平原荒漠植被覆盖度遥感估算二次多项式模型。研究中所采用的无人机遥感与卫星遥感相结合、植被覆盖度统计单元与卫星像元在空间上直接对应的方法，可避免以往相关工作中常以点位测量数据代表卫星像元数据所带来的不确定性。由于所用卫星影像的NDVI数据稳定性相对不足等原因，所建立的遥感估算模型的估算精度尚相对偏低，有待于今后进一步的工作加以改进。
Subjects: Geosciences >> Geography submitted time 2019-01-11 Cooperative journals: 《干旱区地理》
Abstract：新疆荒漠具有分布广泛、成因复杂、类型多样等特点。利用新疆数字地貌图结合Landsat卫星TM数据与GIS制图技术，通过长期野外调查结合有关资料编制荒漠类型图，获得荒漠类型面积数据，据此探讨荒漠分布规律、结构特征、形成演变，并提出利用和保护荒漠的建议。主要结果和结论如下：（1）新疆荒漠具有水平地带性分布与垂直地带性分布的规律及非地带性分布特点，荒漠多分布于干旱程度较高的南疆和东部吐鲁番及哈密地区，东部荒漠占新疆面积的45.86 %，占东部区域面积的91.77 %。（2）荒漠分布广，面积大，总面积达1 31.3 104 km2，占新疆面积的80.55 %。荒漠类型面积最大的是沙漠为42.7104 km2，占荒漠面积32.49 %，泥漠面积仅10 638.5104 km2，占0.81 %。（3）荒漠类型复杂多样，成因各异，有沙漠、砾漠、盐漠等11种类型，分别主要由气候、地貌、地表物质组成、人为作用等因素单独或共同作用所形成。（4）受自然环境变化与人为作用，荒漠类型之间、荒漠类型与其它地物之间可发生演变。（5）各种荒漠类型的要素特征不同，宜合理利用荒漠资源，划分荒漠环境退化敏感区，保护荒漠环境，针对不同荒漠类型采取适应保护措施，以保障区域可持续发展。
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2018-09-03 Cooperative journals: 《干旱区研究》
Abstract：运用GIS空间分析技术，选取土壤侵蚀、土地沙漠化、土壤盐渍化、生物多样性4个生态环境因素进行敏感性评价。结果表明：克拉玛依市中部城区外围以极敏感、高度敏感为主，极敏感区主要分布在克拉玛依市外围的石西公路北部、工业园区南部、无名湖湿地以及西部加依尔山山前地带，占37.38%；高度敏感区主要分布在石西公路以南除湿地外的广大平原区及西南部加依尔山山麓的部分区域，占51.71%；轻度敏感区和非敏感区零星分布在西部和北部加依尔山前，仅占0.76%。研究区生态敏感性整体偏高，极敏感及高度敏感区域应严禁非保护性开发，中度、轻度敏感区域应在生态优先的理念下适度开发。
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