Assessment of gully erosion in a semi-arid catchment of the Loess Plateau, China using photogrammetric techniques

2005 ◽  
Author(s):  
Wensheng Hu ◽  
Jiyuan Liu ◽  
Qiangguo Cai ◽  
Zhiqiang Gao
Keyword(s):  
Loess Plateau ◽  
Gully Erosion ◽  
The Loess Plateau ◽  
Semi Arid

scholarly journals Evolutional Characteristics of Regional Meteorological Drought and Their Linkages with Southern Oscillation Index across the Loess Plateau of China during 1962–2017

2020 ◽  
Vol 12 (18) ◽  
pp. 7237
Author(s):  
Ming Li ◽  
Fuqiang Cao ◽  
Guiwen Wang ◽  
Xurong Chai ◽  
Lianzhi Zhang
Keyword(s):  
Loess Plateau ◽  
Southern Oscillation Index ◽  
Temporal Evolution ◽  
Southern Oscillation ◽  
Arid Area ◽  
The Loess Plateau ◽  
Drought Period ◽  
Humid Area ◽  
Semi Arid ◽  
Meteorological Droughts

The Loess Plateau of China (CLP) is located in the transition zone from a semi-humid climate zone to semi-arid and arid climate zones. It is influenced by the westerly circulation, plateau monsoon, and East Asian monsoon circulation, and the drought disasters across the CLP have obvious regional characteristics. In this study, climate regionalization was performed by a spatial hierarchical cluster approach based on the gridded datasets of monthly precipitation across the CLP from 1961 to 2017. Then, the standardized precipitation index (SPI) was used to explore the temporal evolution of regional meteorological droughts. Finally, wavelet methods were used to investigate the drought cycles in each homogeneous subregion and the linkages between SPI and the Southern Oscillation Index (SOI). The results show that: (1) Spatially, the CLP can be divided into four homogeneous regions, namely, Ordos Plateau semi-arid area (Region I), Northern Shanxi hilly semi-humid area (Region II), Longzhong plateau cold-arid area (Region III), and Fenwei Plain and Shaanxi-Shanxi hilly semi-humid area (Region IV). (2) There are apparent differences in the temporal evolution of meteorological droughts in different subregions, but two wet periods from the 1960s to 1980s and 2010s, and a drought period in the 1990s, can be found in each subregion. (3) There is a significant drought cycle of 3–8 years in the four subregions, and the first main cycles of drought variation are not completely consistent. (4) The linkages between SPI and SOI are time- and space-dependent and the phase differences are dominated by in-phase. The strongest correlations between the two time series occur in the 1980s in the four subregions. The results of this research have important implications for the establishment of drought monitoring programs in homogeneous climate regions, and informed decision making in water resource management.

scholarly journals Hydrologic feasibility of artificial forestation in the semi-arid Loess Plateau of China

2011 ◽  
Vol 15 (8) ◽  
pp. 2519-2530 ◽  
Author(s):  
T. T. Jin ◽  
B. J. Fu ◽  
G. H. Liu ◽  
Z. Wang
Keyword(s):  
Loess Plateau ◽  
Large Scale ◽  
Regional Scale ◽  
Negative Relationship ◽  
Northern Region ◽  
Shaanxi Province ◽  
Stand Age ◽  
Mean Annual Precipitation ◽  
The Loess Plateau ◽  
Semi Arid

Abstract. Hydrologic viability, in terms of moisture availability, is fundamental to ecosystem sustainability in arid and semi-arid regions. In this study, we examine the spatial distribution and after-planting variations of soil moisture content (SMC) in black locust tree (Robinia pseudoacacia L.) plantings in the Loess Plateau of China at a regional scale. Thirty sites (5 to 45 yr old) were selected, spanning an area of 300 km by 190 km in the northern region of the Shaanxi Province. The SMC was measured to a depth of 100 cm at intervals of 10 cm. Geographical, topographic and vegetation information was recorded, and soil organic matter was evaluated. The results show that, at the regional scale, SMC spatial variability was most highly correlated with rainfall. The negative relationship between the SMC at a depth of 20–50 cm and the stand age was stronger than at other depths, although this relationship was not significant at a 5 % level. Watershed analysis shows that the after-planting SMC variation differed depending upon precipitation. The SMC of plantings in areas receiving sufficient precipitation (e.g., mean annual precipitation (MAP) of 617 mm) may increase with stand age due to improvements in soil water-holding capacity and water-retention abilities after planting. For areas experiencing water shortages (e.g., MAP = 509 mm), evapotranspiration may cause planting soils to dry within the first 20 yr of growth. It is expected that, as arid and semi-arid plantings age, evapotranspiration will decrease, and the soil profile may gradually recover. In extremely dry areas (e.g., MAP = 352 mm), the variation in after-planting SMC with stand age was found to be negligible. The MAP can be used as an index to divide the study area into different ecological regions. Afforestation may sequentially exert positive, negative and negligible effects on SMCs with a decrease in the MAP. Therefore, future restoration measures should correspond to the local climate conditions, and the MAP should be a major consideration for the Loess Plateau. Large-scale and long-term research on the effects of restoration projects on SMCs is needed to support more effective restoration policies. The interaction between afforestation and local environmental conditions, particularly water availability to plants, should be taken into account in afforestation campaigns in arid and semi-arid areas.

An integrated simulation model for a semi-arid agroecosystem in the Loess Plateau of northwestern China

1996 ◽  
Vol 52 (1) ◽  
pp. 83-111 ◽  
Author(s):  
Hsin-i Wu ◽  
W.Michael Childress ◽  
Yang Li ◽  
Richard D. Spence ◽  
Jizhou Ren
Keyword(s):  
Simulation Model ◽  
Loess Plateau ◽  
Northwestern China ◽  
The Loess Plateau ◽  
Integrated Simulation ◽  
Semi Arid

scholarly journals Screening of Weeds for Vegetation Recovery in a Pasture in the Semi-arid Region of the Loess Plateau in China.

1993 ◽  
Vol 38 (3) ◽  
pp. 182-189 ◽  
Author(s):  
Nobumasa Ichizen ◽  
Masaru Ogasawara ◽  
Hitoshi Kuramochi ◽  
Makoto Konnai ◽  
Wataru Sunohara ◽  
...  
Keyword(s):  
Loess Plateau ◽  
Arid Region ◽  
Vegetation Recovery ◽  
The Loess Plateau ◽  
Semi Arid Region ◽  
Semi Arid

Study of the Surface Reflectance Relationships Used in MODIS Retrieval Algorithm of Aerosols over the Semi-Arid Region of the Loess Plateau

2010 ◽  
Vol 30 (4) ◽  
pp. 928-934
Author(s):  
白鸿涛 Bai Hongtao ◽  
陈勇航 Chen Yonghang ◽  
冯建东 Feng Jiandong ◽  
黄建平 Huang Jianping ◽  
张文煜 Zhang Wenyu ◽  
...  
Keyword(s):  
Loess Plateau ◽  
Arid Region ◽  
Retrieval Algorithm ◽  
Surface Reflectance ◽  
The Loess Plateau ◽  
Semi Arid Region ◽  
Semi Arid

Factors affecting transpiration of Pinus tabulaeformis in a semi-arid region of the Loess Plateau

2008 ◽  
Vol 3 (2) ◽  
pp. 194-199 ◽  
Author(s):  
Weiqiang Zhang ◽  
Yunqi Wang ◽  
Kangning He ◽  
Yi Zhou ◽  
Xianhua Gan
Keyword(s):  
Loess Plateau ◽  
Arid Region ◽  
Pinus Tabulaeformis ◽  
The Loess Plateau ◽  
Factors Affecting ◽  
Semi Arid Region ◽  
Semi Arid

Responses of ecosystem CO2 exchange to clipping in a semi-arid typical grassland on the Loess Plateau

2020 ◽  
Vol 40 (1) ◽  
Author(s):  
张燕江 ZHANG Yanjiang ◽  
邱莉萍 QIU Liping ◽  
高海龙 GAO Hailong ◽  
刘建 LIU Jian ◽  
魏孝荣 WEI Xiaorong ◽  
...  
Keyword(s):  
Loess Plateau ◽  
Co2 Exchange ◽  
The Loess Plateau ◽  
Semi Arid
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