Coupled impact of decadal precipitation and evapotranspiration on peatland degradation in the Zoige basin, China

Li, Zhiwei; Gao, Peng; Hu, Xuyue; Yi, Yujun; Pan, Baozhu; You, Yuqi

doi:10.1080/02723646.2019.1620579

Cited by 13 publications

(8 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the object-oriented method, the shape information could be distinguished so as to better classify these three types. Therefore, the land use information for the Zoige Plateau was very accurate, with an overall accuracy of 93.2% and a Kappa coefficient of 0.889, which were higher than in the existing research [53,54]. In addition, many previous studies used visual interpretation to obtain land use information in this region [31,32,34,41], which was time-consuming and laborious, so this study also made a contribution to the automatic acquisition of land use information correctly in this region.…”

Section: Discussionmentioning

confidence: 57%

“…Furthermore, relevant national eco-environmental protection projects, including the cessation of artificial drainage and building dams to preserve water, are playing an important role in water conservation and supply [57]. indisputable fact [32,42,54,57] that could cause wetland to become drier grassland, or even sandy land [32,42], but the effect was relatively small [54,[57][58][59]. Anthropogenic factors were dominant in the loss of wetland.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Land Use Changes in the Zoige Plateau Based on the Object-Oriented Method and Their Effects on Landscape Patterns

et al. 2019

View full text Add to dashboard Cite

Land use/land cover change (LUCC) is the most direct driving force of landscape pattern change. The Zoige Plateau is a natural ecosystem with the largest high-altitude swamp wetland in China and its land use pattern has undergone great changes in recent years, but how the changes of each land use type affect the landscape pattern is uncertain. Here, we used the object-oriented method to extract land use information in 2015. Then, combined with land use data, the land use change characteristics from 2000 to 2015 were analyzed. We used the correlation analysis method to analyze the effects of land use changes on landscape pattern systematically. Three key conclusions were reached. (1) Land use information for the Zoige Plateau could be extracted with high accuracy by combining the object-oriented method and support vector machine (SVM). The overall accuracy was 93.2% and the Kappa coefficient was 0.889. (2) The comprehensive dynamic degree of land use was the highest from 2010 to 2015. From 2000 to 2015, the wetland area decreased the fastest because 57.05% of the wetlands were transferred out. Construction land increased the fastest, and the transferred in area from grassland and farmland were the main reason. (3) The effects of unused land, farmland, and construction land on the overall landscape pattern were stronger than that of the other types, among which farmland had the most significant impact (with a correlation coefficient of 0.959, p < 0.001). The change of unused land was the most highly significant factor associated with the landscape area pattern, and both the water body and unused land showed strong correlations with landscape shape pattern change. This suggested that the effects of land use types occupying a relatively small area on the landscape pattern were intensified. This study will provide guidance for the environmental management of local land resources and other natural ecosystem areas.

show abstract

Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Land Use Changes in the Zoige Plateau Based on the Object-Oriented Method and Their Effects on Landscape Patterns

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Positive trends in ET were observed in wetlands in the wet areas of the Tibetan Plateau, such as the Zoige basin. In contrast, a negative trend in ET was observed in wetlands in the hinterland of the Tibetan Plateau, such as the Maidika wetland and Qiangtang plateau where evapotranspiration is constrained by soil moisture [14,47]. This increasing trend, however, is not consistent with an overall trend of reference evapotranspiration across the Tibetan Plateau or Eastern China, in general, where decreasing evapotranspiration is considered to be related to decreasing wind speed caused by a decline in the intensity of regional monsoon circulation and a decrease in the solar radiation [42,48,49].…”

Section: Discussionmentioning

confidence: 90%

“…However, a comparison between our study region with a recent study in Zoige wetland (100-150 km to the east with an elevation around 700-900 m lower than our region) offers some very general evidence that the estimates of the model fall within a reasonable range. The authors of that study estimated the evaporation fraction (Kc)-the ratio between actual evapotranspiration and reference evapotranspiration-to be 0.40, 0.73, and 0.60 in grassland and 0.70, 1.09, 0.62 for peatland at Maqu county during the initial, mid-, and endsection of the growing season [14]. Given that the Maqu weather station is only 83 km to the northeast and 150 m lower in elevation than Jiuzhi weather station, we may assume that these values applied to the evaporation fraction for wetland and grassland near the Jiuzhi township.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Challenges in Reconciling Satellite-Based and Locally Reported Estimates of Wetland Change: A Case of Topographically Constrained Wetlands on the Eastern Tibetan Plateau

Fang

Zaitchik

2021

Remote Sensing

View full text Add to dashboard Cite

The coupling of rapid warming and wetland degradation on the Tibetan Plateau has motivated studies of climate influence on wetland change in the region. These studies typically examine large, topographically homogeneous regions, whereas conservation efforts sometimes require fine-grained information in rugged terrain. This study addresses topographically constrained wetlands in Eastern Tibetan, where headers report significant wetland degradation. We used Landsat images to examine changes in wetland areas and Sentinel-1 SAR images to investigate water level and vegetation structure. We also analyzed trends in precipitation, growing season length, and reference evapotranspiration in weather station records. Snow cover and the vegetation growing season were quantified using MODIS observations. We analyzed estimates of actual evapotranspiration using the Atmosphere-Land Exchange Inverse model (ALEXI) and the Simplified Surface Energy Balance model (SSEBop). Satellite-informed analyses failed to confirm herders’ accounts of reduced wetland function, as no coherent trends were found in wetland area, water content, or vegetation structure. An analysis of meteorological records did indicate a warming-induced increase in reference evapotranspiration, and both meteorological records and satellites suggest that the growing season had lengthened, potentially increasing water demand and driving wetland change. The discrepancies between the satellite data and local observations pointed to temporal, spatial, and epistemological gaps in combining scientific data with empirical evidence in understanding wetland change on the Tibetan Plateau.

show abstract

Spatiotemporal variations of groundwater and gully impact in two peatland watersheds in the Upper Yellow River, Qinghai‐Tibet Plateau

Li,

Zhou,

Guo

et al. 2024

Ecohydrology

View full text Add to dashboard Cite

The spatiotemporal variability of groundwater level is an important property of peatland hydrology that directly alternates water storage. Nonetheless, the current understanding of the variations of groundwater level over long periods of time remains limited. In this study, we investigated two peatland watersheds (0.151 km2 for Watershed 1 and 0.844 km2 for Watershed 2) in the Zoige Basin in the upper watershed of the Yellow River to monitor temporal variability of groundwater level using self‐recorded water loggers over 4 years (2017–2021). The main results demonstrate that (1) groundwater level variations were controlled by gully drainage in sites adjacent to the gully but were more affected by rainfall in sites distant from the gully. The groundwater level near the gully downcut was lower than that near the gully without complete downcutting through the pear layer, with a maximum difference of 58.3 cm, indicating the longitudinal effect of groundwater level in the watershed. (2) Because the rainfall had a lag effect on the groundwater level, the length of lag gradually decreased with increased rainfall intensity (i.e., the lag time for sites distant from the gully was about 18 min shorter than that of sites close to the gully in Watershed 1). (3) The peak values of the groundwater level occurred simultaneously with the maximum and minimum rainfall in Watershed 2, and the peak occurrence time was related to the ratio of precipitation to evaporation. In the downstream sites, the groundwater level fluctuated more than the upstream ones in Watershed 2. Moreover, the average groundwater level in the upstream sites was 14.3 cm higher than that of the middle ones, indicating a decreasing trend of water storage along the gully. (4) The differences in groundwater level between wet and dry seasons were clear, but the difference was smaller in the upstream sites due to limited gully incision and higher water storage within the peat layer. Additionally, groundwater level changes were more extreme on rainy days during both the wet and dry seasons, but the different intensities of rainfall resulted in stable groundwater in the dry season and an oscillating groundwater level in the wet season in Watershed 2. This study uncovers the groundwater dynamics in the two peatland watersheds, which is of great significance for understanding runoff variation, ecohydrological processes, and wetland shrinkage.

show abstract

Coupled impact of decadal precipitation and evapotranspiration on peatland degradation in the Zoige basin, China

Cited by 13 publications

References 51 publications

Land Use Changes in the Zoige Plateau Based on the Object-Oriented Method and Their Effects on Landscape Patterns

Land Use Changes in the Zoige Plateau Based on the Object-Oriented Method and Their Effects on Landscape Patterns

Challenges in Reconciling Satellite-Based and Locally Reported Estimates of Wetland Change: A Case of Topographically Constrained Wetlands on the Eastern Tibetan Plateau

Spatiotemporal variations of groundwater and gully impact in two peatland watersheds in the Upper Yellow River, Qinghai‐Tibet Plateau

Contact Info

Product

Resources

About