期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Climate transformation to warm-humid and its effect on river runoff in the source region of the Yellow River 被引量:1
1
作者 YongChao Lan HuiJun Jin +3 位作者 ChengFang La Jun Wen Jie Song JinPeng Liu 《Research in Cold and Arid Regions》 CSCD 2014年第3期257-265,共9页
The change characteristics and trends of the regional climate in the source region of the Yellow River, and the response of runoff to climate change, are analyzed based on observational data of air temperature, precip... The change characteristics and trends of the regional climate in the source region of the Yellow River, and the response of runoff to climate change, are analyzed based on observational data of air temperature, precipitation, and runoff at 10 main hydrological and weather stations in the region. Our results show that a strong signal of climate shift from warm-dry to warm-humid in the western parts of northwestern China (Xinjiang) and the western Hexi Corridor of Gansu Province occurred in the late 1980s, and a same signal of climate change occurred in the mid-2000s in the source region of the Yellow River located in the eastern part of northwestern China. This climate changeover has led to a rapid increase in rainfall and stream runoff in the latter region. In most of the years since 2004 the average annual precipitation in the source region of the Yellow River has been greater than the long-term average annual value, and after 2007 the runoff measured at all of the hydrologic sections on the main channel of the Yellow River in the source region has also consistently exceeded the long-term average annual because of rainfall increase. It is difficult to determine the prospects of future climate change until additional observations and research are conducted on the rate and temporal and spatial extents of climate change in the region. Nevertheless, we predict that the climate shift from warm-dry to warm-humid in the source region of the Yellow River is very likely to be in the decadal time scale, which means a warming and rainy climate in the source region of the Yellow River will continue in the coming decades. 展开更多
关键词 global warming source region of yellow river climate shifting hydrologic section
下载PDF
Biological Characteristics of Carex brunnescens for Sand Fixation in the Source Region of the Yellow River 被引量:1
2
作者 康建军 赵明 +3 位作者 马和 张洋东 刘冬皓 童胜利 《Agricultural Science & Technology》 CAS 2017年第9期1716-1722,1725,共8页
Carex brunnescens, a pioneer plant that has an excellent ability to fix sand in the source region of the Yellow River (Maqu), plays an important role in maintaining the ecosystem stability of alpine grassland in Maq... Carex brunnescens, a pioneer plant that has an excellent ability to fix sand in the source region of the Yellow River (Maqu), plays an important role in maintaining the ecosystem stability of alpine grassland in Maqu. In this study, the biological characteristics (phonological characters, the growth process of overground and underground organs, and the morphological characters of underground organs) of C. brunnescens were studied by a field observation experiment. The results showed that C. brunnescens had the characteristics of turning green earlier than other plants, a long growth period, and two flowering and fruiting cycles. The leaf width, length and number of a single plant, and the density, coverage and leaf density of community increased significantly from the leaf extension period to the fruit mature period and then tended to be stable in the withering period, while the plant height and leaf area of a single plant and the leaf area of community rose significantly at first and then decreased. Underground stems (horizontal and vertical stems) and roots of C. brunnescens could survive in sand at a depth of 0-60 cm. The number of middle roots (0.2-0.5 mm in diameter) was the largest in all soil layers (0-20, 20-40 and 40-60 cm), and the total length of fine roots (〈0.2 mm) were the maximum in the sand at a depth of 20-40 cm, while the total length of middle roots was the maximum in the sand layer at a depth of 0-20 cm. The length, fresh weight and dry weight of the main root, horizontal and vertical stems was the maximum in the sand layer at a depth of 10-30 cm and was the minimum in the sand layer at a depth of 40-50 cm. It is concluded that C. brunnescens can well adapt to the alpine sand habitat of Maqu, can be used as the constructive species for ecological restoration in the alpine desertified grassland of Maqu, and has good popularization and application prospects. 展开更多
关键词 source region of yellow river (Maqu) Desertified grassland Carex brunnescens Biological characteristics for sand fixation
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部