助手标题
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
共[7660]条 当前为第1条到20条[由于搜索限制,当前仅支持显示前5页数据]
 

相关语句
forests
The ecological water requirement of forests is defined as the water resources used to maintain and improve the natural balance of forest ecosystems, which can be expressed by evapotranspiration of trees during the growing season.
      
With geographic information system (GIS), the ecological water requirement for forests in the Jinghe watershed, western China was estimated.
      
The results revealed that the minimum and suitable ecological water requirements of the forests in the Jinghe watershed were approximately 204×107 and 340×107 m3, respectively.
      
Although the RENIs of plantations in rehabilitated fields are a little lower than those of natural forests, they are higher than those of cultivated crops.
      
Comparative Analysis of Plant Diversity of Pinus tabulaeformis Forests in Ten Regions of Beijing Mountainous Areas
      
Based on investigations during 1998-2003, shrubs and herbs, as well as indicators of similarity and diversity in Pinus tabulaeformis forests of ten regions around Beijing were compared and analyzed, and protection measures were suggested.
      
tabulaeformis forests of Shidu, Mutianyu, and Yunfengshan are rich in species diversity and have great similarities.
      
tabulaeformis forests of Baihuashan, Shidu, and Labagoumen occur more frequently than in other regions, while the number of plants in Tanjiesi and Miaofengshan are far less.
      
tabulaeformis forests with a clumped spatial pattern but rarely appeared in other forest types, indicating that P.
      
tabulaeformis forests are ideal habitats for orchid species.
      
Distribution of Landscape Elements Along Environmental Gradients in Over-Cut Forests
      
Quantitative site classification in the key county in the conversion of farmland to forests project
      
The growth process of natural poplar-birch forests
      
With a combination of permanent and temporary sample plots, we investigated the growth conditions of natural poplar-birch forests.
      
The forests were divided into four site classes, using statistical and analytical techniques in a quantitative model, in descending order where site class I was the best.
      
On this basis, the growth of natural poplar-birch forests in the different site classes was studied.
      
Results of this study provide a theoretical basis for the directive cultivation of natural poplar-birch forests.
      
Soil fractal features of subalpine coniferous forests in western Sichuan under different anthropogenic disturbances
      
The study introduces a new way to investigate the recovery and reestablishment of subalpine coniferous forests.
      
Nutrient dynamics of foliar litter in reciprocal decomposition in tropical and subtropical forests
      
 

首页上一页12345下一页尾页 

 
CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社