Temporal-spatial dynamic change characteristics of evapotranspiration in arid region of Northwest China

Xingyao, 邓兴耀 Deng; Yang, 刘洋 Liu; Zhihui, 刘志辉 Liu; Junqiang, 姚俊强 Yao

doi:10.5846/stxb201601270190

Cited by 9 publications

(11 citation statements)

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“…In addition to a large amount of farmland and pasture, ecological water transfer projects in the basin have also been implemented in Xinjiang [68]. Global warming and vegetation greening lead to an accelerated terrestrial carbon-water cycle [36,69]. This study suggested that ET in the entire Xinjiang region presented a decreasing trend, whereas GPP and LAI showed an increasing trend, which is consistent with the findings of previous studies [8,15,20,26,69].…”

Section: Discussionsupporting

confidence: 89%

“…Global warming and vegetation greening lead to an accelerated terrestrial carbon-water cycle [36,69]. This study suggested that ET in the entire Xinjiang region presented a decreasing trend, whereas GPP and LAI showed an increasing trend, which is consistent with the findings of previous studies [8,15,20,26,69]. On the one hand, the inconsistent changing trends of ET and both GPP and LAI in Xinjiang may be due to the apparent differences in the sensitivity of ET to climate and vegetation changes in various zones [68].…”

Section: Discussionmentioning

confidence: 99%

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Ecological Responses to Climate Change and Human Activities in the Arid and Semi-Arid Regions of Xinjiang in China

Zhou

et al. 2022

Remote Sensing

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Understanding the impacts and extent of both climate change and human activities on ecosystems is crucial to sustainable development. With low anti-interference ability, arid and semi-arid ecosystems are particularly sensitive to disturbances from both climate change and human activities. We investigated how and to what extent climate variation and human activities influenced major indicators that are related to ecosystem functions and conditions in the past decades in Xinjiang, a typical arid and semi-arid region in China. We analyzed the changing trends of evapotranspiration (ET), gross primary productivity (GPP) and leaf area index (LAI) derived from the Moderate-Resolution Imaging Spectroradiometer (MODIS) satellite product and the Breathing Earth System Simulator (BESS) model in Xinjiang for different climate zones. We separated and quantified the contributions of climate forcing and human activities on the trends of the studied ecosystem indicators using the residual analysis method for different climate zones in Xinjiang. The results show that GPP and LAI increased and ET decreased from 2001 to 2015 in Xinjiang. Factors that dominate the changes in ecosystem indicators vary considerably across different climate zones. Precipitation plays a positive role in impacting vegetation indicators in arid and hyper-arid zones and temperature has a negative correlation with both GPP and LAI in hyper-arid zones in Xinjiang. Results based on residual analysis indicate that human activities could account for over 72% of variation in the changes in each ecosystem indicator. Human activities have large impacts on each vegetation indicator change in hyper-arid and arid zones and their relative contribution has a mean value of 79%. This study quantifies the roles of climate forcing and human activities in the changes in ecosystem indicators across different climate zones, suggesting that human activities largely influence ecosystem processes in the arid and semi-arid regions of Xinjiang in China.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Ecological Responses to Climate Change and Human Activities in the Arid and Semi-Arid Regions of Xinjiang in China

Zhou

et al. 2022

Remote Sensing

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“…At present, the Hurst index is often calculated using the re-scaled range (R/S) method to determine the future regional drought change. Some studies have found that [37], the Hurst index obtained by R/S analysis is more realistic, and the calculation formula is as follows:…”

Section: The Hurst Indexmentioning

confidence: 99%

Temporal and Spatial Characteristics of Agricultural Drought Based on the TVDI in Henan Province, China

Li,

Wang,

Wang

et al. 2024

Water

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As a major grain-producing province in China’s Central Plains, Henan Province is severely impacted by drought, making the study of agricultural drought characteristics in the region crucial. Theil–Sen (Sen) trend analysis, the Mann–Kendall (M-K) test and the Hurst index method were used to systematically analyze the spatial variation characteristics of agricultural drought based on the Temperature Vegetation Dryness Index (TVDI). The results show that: (1) The drought occurs in central, northwestern and southern Henan on an annual scale. The drought situation will continue to increase in northern, eastern northeastern and central Henan. (2) The drought in spring, summer and winter showed an increasing trend, but the opposite trend was observed in autumn. The increasing trend of drought in each season is mainly distributed in northern, central and eastern Henan. (3) The drought in January, February, April, July, September and December showed an increasing trend, while the drought in the other 6 months showed a decreasing trend. The increase in drought during July and August was not pronounced, while the drought situation in September remained largely unchanged. The distribution of drought across the other months exhibited varying patterns across different regions. Overall, the drought trend in Henan Province is on the rise, displaying distinct seasonal and regional patterns in its temporal and spatial distribution. The results can provide a reference for Henan Province to formulate effective measures of drought resistance and disaster reduction to ensure grain production.

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“…In Northwest China, there are four climate types from south to north: subtropical monsoon climate, temperate monsoon climate, temperate continental arid climate and plateau mountain climate. Most of the area exhibits a typical continental climate, with very low mean annual precipitation (below 250 mm), mean annual temperature from −2 to 19 • C [31], and annual evapotranspiration ranging from 225 to 285 mm [32]. The main land cover types in this region consist of temperate evergreen forest (i.e., Picea spp., Abies sibirica, etc.…”

Section: Study Areamentioning

confidence: 99%

The Changes in Cropland Pattern Enhanced Carbon Storage in Northwest China

Kong,

Chen

2023

Agronomy

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Northwest China has experienced dramatic changes in agricultural land area in recent years. The effects of these changes on carbon storage are unknown, and this ambiguity hinders land development policies related to carbon emissions. In this study, we evaluated the effects of annual cropland changes (expansion and abandonment) during 2000 to 2020 on carbon storage in Northwest China by using land use data, carbon density data, and statistical yearbooks using the Intergovernmental Panel on Climate Change (IPCC) method. The results indicated that the area of cropland increased by 1.47 × 106 ha from 2000 to 2020, in that the area of cropland expansion and abandonment are 3.58 × 106 and −2.11 × 106 ha, respectively. Cropland expansion was mainly from other land and grassland, and the conversion of cropland to grassland made up the largest proportion of cropland abandonment, followed by built-up land. The cropland changes resulted in a total carbon sequestration of 4.05 Tg (0.20 Tg C year−1), including a 17.66 Tg decrease and 21.71 Tg increase in carbon storage due to, respectively, cropland expansion and cropland abandonment, in which the conversion of forest to cropland (−8.60 Tg) and cropland to forest (11.16 Tg) were the main causes of the increase and decrease in carbon storage. Specifically, regional carbon storage due to cropland changes exhibited an increasing variation characteristic during 2000 to 2007, a gradually decreasing variation characteristics during 2007 to 2014, and fluctuated stabilization since then (during 2014 to 2020). In addition, the highest carbon emission was found in Xinjiang (−3.68 Tg), followed by Ningxia (−0.21 Tg) province, while Shanxi (3.44 Tg), Gansu (3.17 Tg) and Qinhai (1.33 Tg) had carbon accumulation. Overall, cropland changes acted as a carbon sink in Northwest China from 2000 to 2020. We suggest that the development of high-carbon-density lands or the conversion of low-carbon-density lands are critical to increasing future carbon sequestration due to cropland change.

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Temporal-spatial dynamic change characteristics of evapotranspiration in arid region of Northwest China

Cited by 9 publications

References 0 publications

Ecological Responses to Climate Change and Human Activities in the Arid and Semi-Arid Regions of Xinjiang in China

Ecological Responses to Climate Change and Human Activities in the Arid and Semi-Arid Regions of Xinjiang in China

Temporal and Spatial Characteristics of Agricultural Drought Based on the TVDI in Henan Province, China

The Changes in Cropland Pattern Enhanced Carbon Storage in Northwest China

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