Scholarlink

<p>As a pivotal national ecological barrier, China’s Agro-pastoral Transition Zone (APTZNC) faces challenges from climate change and anthropogenic activities, carbon and water cycles in this region are vital for ecological security. This study leverages multiple remote sensing data, Sen slope estimation, the Mann–Kendall trend test, multiple linear regression, and spatial dominant driver identification, we quantitatively assessed the spatiotemporal evolution of carbon and water use efficiency (CWUE) in the APTZNC (2001–2023) and its responses to climatic change and anthropogenic activities. The main findings of the study as follows: (1) The Western region demonstrates superior carbon use efficiency (CUE), peaking at an altitude of 2,000&#xa0;m. The Eastern region exhibits higher water use efficiency (WUE), which declines with increasing altitude. (2) WUE based on gross primary productivity (WUE<sub>GPP</sub>) and WUE based on net primary productivity (WUE<sub>NPP</sub>) significantly increased, occupying 37.67% and 41.90% of the region, predominantly concentrated in key afforestation areas. CUE is experiencing a notable decline across 16.43% in the region, primarily located in the dry-to-subhumid transition zone. (3) Temperature (Temp) is the primary driver of changes in WUE<sub>GPP</sub> and WUE<sub>NPP</sub>, with sunshine (Sun) as a secondary factor; changes in CUE are predominantly influenced by Sun, secondary drivers contributing to the increasing and decreasing trends in CUE are Temp and human footprint (Foot), respectively. (4) Climate change predominantly governs WUE<sub>GPP</sub> and WUE<sub>NPP</sub> changes, with limited anthropogenic influence. However, anthropogenic activities contribute significantly more to CUE changes, primarily observed in Ulanqab and the southwestern and southeastern regions. This study enhances comprehension of carbon–water coupling mechanisms in the APTZNC, providing a basis for improving ecosystem carbon–water coupling efficiency and optimizing resource allocation to promote regional sustainable development.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Impacts of climate change and anthropogenic activities on carbon and water use efficiency in the agro-pastoral zone of Northern China

  • 期刊论文

  • 发表日期：

    2026年1月29日

查看全文
  • Guangchao Li,
  • Xiang Li,
  • Zhaoqin Yi,
  • Mengjia Feng,
  • Yanjie Li,
  • Zhengrong Liu,
  • Yuhan Chang,
  • Yayan Lu

摘要

As a pivotal national ecological barrier, China’s Agro-pastoral Transition Zone (APTZNC) faces challenges from climate change and anthropogenic activities, carbon and water cycles in this region are vital for ecological security. This study leverages multiple remote sensing data, Sen slope estimation, the Mann–Kendall trend test, multiple linear regression, and spatial dominant driver identification, we quantitatively assessed the spatiotemporal evolution of carbon and water use efficiency (CWUE) in the APTZNC (2001–2023) and its responses to climatic change and anthropogenic activities. The main findings of the study as follows: (1) The Western region demonstrates superior carbon use efficiency (CUE), peaking at an altitude of 2,000 m. The Eastern region exhibits higher water use efficiency (WUE), which declines with increasing altitude. (2) WUE based on gross primary productivity (WUEGPP) and WUE based on net primary productivity (WUENPP) significantly increased, occupying 37.67% and 41.90% of the region, predominantly concentrated in key afforestation areas. CUE is experiencing a notable decline across 16.43% in the region, primarily located in the dry-to-subhumid transition zone. (3) Temperature (Temp) is the primary driver of changes in WUEGPP and WUENPP, with sunshine (Sun) as a secondary factor; changes in CUE are predominantly influenced by Sun, secondary drivers contributing to the increasing and decreasing trends in CUE are Temp and human footprint (Foot), respectively. (4) Climate change predominantly governs WUEGPP and WUENPP changes, with limited anthropogenic influence. However, anthropogenic activities contribute significantly more to CUE changes, primarily observed in Ulanqab and the southwestern and southeastern regions. This study enhances comprehension of carbon–water coupling mechanisms in the APTZNC, providing a basis for improving ecosystem carbon–water coupling efficiency and optimizing resource allocation to promote regional sustainable development.