Desertification problems in the Yangtze River source area, China

2004 ◽  
Vol 15 (2) ◽  
pp. 177-182 ◽  
Author(s):  
P. Yan ◽  
G. R. Dong ◽  
Z. Z. Su ◽  
D. S. Zhang
Keyword(s):  
Yangtze River ◽  
Source Area ◽  
The Yangtze River

scholarly journals C:N:P stoichiometry in six distinct habitats of a glacier terminus in the Yangtze River Source Area

2021 ◽  
Author(s):  
Ze Ren ◽  
Hongkai Gao ◽  
Wei Luo ◽  
James J. Elser
Keyword(s):  
Yangtze River ◽  
Source Area ◽  
Future Climate Change ◽  
The Yangtze River ◽  
C:N:P Stoichiometry ◽  
Organic C ◽  
Nutrient Contents ◽  
Glacier Terminus ◽  
N:P Ratios ◽  
Successional Stages

Glaciers are among the least explored environments on Earth, especially from a perspective of nutrient stoichiometry. In this study, we documented and compared the nutrient availabilities (concentrations) and composition (stoichiometric ratios) of nutrients (C, N, and P) in six distinct habitats of a glacier terminus in the Yangtze River Source area, including surface ice (SI), basal ice (BI), basal sediment (BaS), newly exposed forefront soil close to glacial terminus (TS), soil at increasing distances from glacier terminus (DS), and forefront soil with well-developed vegetation (VS). The results showed that SI had significantly higher DOC and N concentrations as well as higher C:P and N:P ratios than BI. However, BI had significantly higher SRP than SI. In addition, both SI and BI had very high C:P and N:P ratios, suggesting P-limitation. For sediment/soil in glacier terminus, nitrogen and organic carbon concentrations were significantly lower in BaS, TS, and DS than in VS. Moreover, TP and SRP concentrations were significantly higher in BaS and VS than in TS and DS. These nutrient patterns could be explained by differences in biotic influence in soil development or by changes in soil physical properties. With regard to nutrient limitation, VS had a significantly higher C:N, C:P, and N:P ratios than BaS, TS, and DS, supporting a long-held biogeochemical and ecological paradigm that ecosystem processes during early successional stages are primarily organic C and N limited but are P-limited in later successional stages. Considering that glaciers cover around 10% of the terrestrial landmass and are experiencing severe retreat, documenting and comparing nutrient contents and stoichiometry in glacier terminus can further our understanding of global biogeochemical cycles under future climate change regimes.

scholarly journals Attribution Analysis of Climate and Anthropic Factors on Runoff and Vegetation Changes in the Source Area of the Yangtze River from 1982 to 2016

Land ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 612
Author(s):  
Guangxing Ji ◽  
Huiyun Song ◽  
Hejie Wei ◽  
Leying Wu
Keyword(s):  
Climate Change ◽  
Yangtze River ◽  
Vegetation Change ◽  
Climatic Factors ◽  
Source Area ◽  
Linear Regression Method ◽  
The Yangtze River ◽  
Potential Evaporation ◽  
Runoff Change ◽  
The Impact

Analyzing the temporal variation of runoff and vegetation and quantifying the impact of anthropic factors and climate change on vegetation and runoff variation in the source area of the Yangtze River (SAYR), is of great significance for the scientific response to the ecological protection of the region. Therefore, the Budyko hypothesis method and multiple linear regression method were used to quantitatively calculate the contribution rates of climate change and anthropic factors to runoff and vegetation change in the SAYR. It was found that: (1) The runoff, NDVI, precipitation, and potential evaporation in the SAYR from 1982 to 2016 all showed an increasing trend. (2) The mutation year of runoff data from 1982 to 2016 in the SAYR is 2004, and the mutation year of NDVI data from 1982 to 2016 in the SAYR is 1998. (3) The contribution rates of precipitation, potential evaporation and anthropic factors to runoff change of the SAYR are 75.98%, −9.35%, and 33.37%, respectively. (4) The contribution rates of climatic factors and anthropic factors to vegetation change of the SAYR are 38.56% and 61.44%, respectively.

Jurassic rocks, bivalves, and depositional environments of the source area of the Yangtze River, Qinghai Province, western China

2011 ◽  
Vol 54 (8) ◽  
pp. 1136-1148 ◽  
Author(s):  
HuaZhou Yao ◽  
RenJie Zhang ◽  
QiFa Duan ◽  
XianCai Sheng ◽  
ZhiJun Niu ◽  
...  
Keyword(s):  
Yangtze River ◽  
Source Area ◽  
Depositional Environments ◽  
Western China ◽  
The Yangtze River ◽  
Qinghai Province ◽  
Jurassic Rocks

Yiling Multi-span Cable-Stayed Bridge over the Yangtze River

2004 ◽  
Vol 88 (8) ◽  
pp. 59-64
Author(s):  
Changyu Shao ◽  
Qinger Deng
Keyword(s):  
Yangtze River ◽  
The Yangtze River ◽  
Cable Stayed Bridge
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