浅谈勘察设计企业信息化集成应用系统建设的一般性要求     

姜得晟 《中国勘察设计》2008,(1):64-67

阐述了勘察设计企业建设信息化集成应用系统的各项要求。包括系统建设总体要求、系统设计原则要求、系统标准化和扩展性要求、系统实施要求、系统平台要求、基本功能要求、系统性能要求、系统及软件接口要求和系统测试要求等。从而确定如何进行信息化系统建设。  相似文献   

制约与创作——郑州景峰国际中心建筑方案设计     

杨凤臣  丁大伟 《中国勘察设计》2008,(3):83-84

郑州景峰国际中心位于郑州郑东新区内,它是集酒店及配套和酒店式公寓为一体的综合建筑。该设计比较成功地将紧张用地、规划部门的各种规定和业主的要求及建筑设计充分结合起来。相信它的建成会为郑州郑东新区增添一个高标准的商务及居住场所。  相似文献   

艾比湖流域植被生态需水量   总被引：1，自引：0，他引：1  

范亚云  郭玉川  卢刚  陈丽华  张晓玉  何学敏  杨建军 《中国沙漠》2018,38(4):865-871

基于遥感数据,通过SEBAL模型估算蒸散量,计算艾比湖流域不同植被类型下植被生长季（59月）的生态需水量。结果表明：研究区植被主要为牧草地、灌木林地、耕地、乔木林地,面积分别为13 944km²（50%）、8 071km²（29%）、5 022km²（18%）、566km²（2%）。SEBAL模型估算的日蒸散量7月最大,为4.36mm。5、6、8、9月日蒸散量分别为4.26、4.07、4.24、4.15mm。SEBAL模型估算结果整体相对误差在10%以内,在允许范围内。20002015年生长季植被生态需水量整体上呈现出增加-减少-增加的变化趋势,2000、2005、2010、2015年分别为151.003×10⁸、149.611×10⁸、144.431×10⁸、136.374×10⁸m³。各植被类型下的生态需水量相比,牧草地 > 灌木林地 > 耕地 > 乔木林地,牧草地约占总生态需水量的53%～55%,而灌木林地、耕地的生态需水量分别占21%～25%、19%～20%,乔木林地的生态需水量所占比例最小,仅为2%～3%。  相似文献   

Soil seed flora, germination and regeneration pattern of woody species in an Acacia woodland of the Rift Valley in Ethiopia     

Mekuria Argaw  Demel Teketay  Mats Olsson 《Journal of Arid Environments》1999,43(4):411

The objectives of this study were to determine the composition, density and spatial distribution of the soil seed bank of woody species, as well as their regeneration pattern in two different land use systems, controlled (ranch) and open grazing, in an Acacia woodland of the Rift Valley in Ethiopia. We also compared the species composition of the soil seed bank and the above-ground vegetation to find out if differences exist in the soil seed bank and advance regeneration between the two land use systems. The germination requirements of seeds of the woody species were also investigated under laboratory conditions. Acacia senegal, Acacia seyal, Acacia tortilis, Dichrostacys cinerea and Balanites aegyptiaca were encountered in the above-ground vegetation in both systems. Seeds of only A. tortilis (90±32 seeds m⁻²) from the ranch, and A. senegal (5±3 seeds m⁻²) and A. tortilis (72±34 seeds m⁻²) from the open system were found in the soil seed bank along transects with patchy horizontal pattern. The two systems were not significantly different in density of soil seed banks of A. senegal andA. tortilis . Jaccard's similarity index showed that only a few woody species were common in the soil seed flora and above ground vegetation. However, all of the species accumulated seeds (58±43–331±130 seeds m⁻²) in/on the soil under the canopy. Very large numbers of seeds of A. tortilis (19382±9722 seeds m⁻²) and D. cinerea (1278±494 seeds m⁻²) were also found in barns. Most of the seeds recovered from the soil samples (60–80%) were found in the litter layer. Acid and mechanical scarification improved legume germination (36–99% and 60–99%, respectively) over boiling water (0–48%). Treatment means differed significantly for all the legumes (p<0·001) but not for Balanites. Height and diameter class distribution of regeneration of A. tortilis and D. cinerea in both systems and A. senegal in the open system had a negative exponential correlation (r_s=−0·5, −0·25 and −0·86, respectively). A. seyal and B. aegyptiaca showed poor regeneration. Horizontal distribution of advance regeneration of all the species was patchy. Advance regeneration of A. seyal, A. tortilis and B. aegyptiaca were not significantly different, while that of A. senegal and D. cinerea were significantly different between the two systems. Poor representation of species in the soil seed bank along transects and in the different height and diameter classes may be attributed to the low density of mature trees as well as the mode and strategy of seed dispersal. Ungulate and wind dispersed species (e.g. A. senegal, A. tortilis and D. cinerea) were highly favoured. Patchiness in the distribution of seeds and advance regeneration was also a result of endozoochory. Dispersal of non-ungulate dispersed seeds (A. senegal, A. seyal and B. aegyptiaca) was restricted to the canopy zone. Piles of seeds ofA. tortilis and D. cinerea that were found in barns were a result of consumption of their pods by cattle. High concentration of seeds in the litter layer may be due to low soil disturbance and larger size of seeds. The height and diameter class distribution of A. senegal (in the open system), A. tortilis and D. cinerea also indicated that the species have good regeneration. Results from the germination tests indicated that seeds of the legumes require pre-sowing treatments to give a rapid, uniform and improved germination. Intervention through artificial regeneration should be employed to improve the density and regeneration capacity of those species with hampered regeneration at both systems.  相似文献   

基于鹭类生境需求的海岸带海陆一体化修复     

张雅棉  黄智君  李玉  陈志鸿  王文卿 《湿地科学与管理》2021,17(1):56-60

以泉州湾河口湿地为研究对象,开展海陆一体化修复工程,包括滩涂红树植物种植和互花米草控制、鱼塘改造和退养还湿、海陆交错带植被修复等手段。通过评估植被和生境恢复情况,对比修复前后鹭科鸟类的群落组成变化,探讨滨海湿地修复对鸟类的生态作用和修复的有效性。结果表明:修复工程开展后,滩涂和鱼塘生境得到了改善;海陆交错带植被覆盖率和植被指数NDVI呈上升趋势;研究区内共记录到鹭科鸟类11种18164只次;与修复前相比,修复后第2年鹭类种类和数量均呈现一定程度的下降;修复后第4年鹭类数量显著增加。泉州湾河口湿地修复工程为鹭类提供了更多适宜的栖息环境,对鹭类多样性保护具有重要意义。  相似文献