Scholarlink

<p>Carbon Use Efficiency (CUE), quantified as the ratio of net primary production to gross primary production (NPP/GPP), serves as a crucial indicator of ecosystem carbon sequestration capacity. However, understanding of its spatiotemporal dynamics and drought response mechanisms in arid inland basins remains limited. This study investigates the CUE characteristics in the Manas River Basin, a representative arid endorheic basin in Xinjiang, China, using MODIS satellite data (2001-2020). Results demonstrate that the multi-year mean CUE of the basin was 0.50 (±0.12), with coniferous forests exhibiting the highest values and croplands the lowest. Seasonal analysis revealed CUE in spring and autumn significantly exceeded that in winter (p&lt;0.01). Spatially, 57.99% of the basin displayed low CUE fluctuation, primarily distributed in grassland and woodland areas. Future trend projections indicate divergent persistence patterns between plain and desert grasslands. Drought response analysis identified a dominant 3-month lag effect, with forests showing greater drought resistance and longer response lags compared to croplands (1.2 months longer, p=0.03). The ecosystem maintains high resilience, regulated by the interactive effects of vegetation type, irrigation practices, and climate gradients. These findings establish a mechanistic framework for understanding carbon cycling processes in arid lands under climate stress, providing scientific basis for global dryland ecosystem management.</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

Vegetation carbon use efficiency response to drought in the Manas River Basin of Xinjiang

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月17日

查看全文
  • Jingjing Kong,
  • Mei Zan,
  • Zhizhong Chen,
  • Shunfa Yang,
  • Jia Zhou,
  • Lili Zhai

摘要

Carbon Use Efficiency (CUE), quantified as the ratio of net primary production to gross primary production (NPP/GPP), serves as a crucial indicator of ecosystem carbon sequestration capacity. However, understanding of its spatiotemporal dynamics and drought response mechanisms in arid inland basins remains limited. This study investigates the CUE characteristics in the Manas River Basin, a representative arid endorheic basin in Xinjiang, China, using MODIS satellite data (2001-2020). Results demonstrate that the multi-year mean CUE of the basin was 0.50 (±0.12), with coniferous forests exhibiting the highest values and croplands the lowest. Seasonal analysis revealed CUE in spring and autumn significantly exceeded that in winter (p<0.01). Spatially, 57.99% of the basin displayed low CUE fluctuation, primarily distributed in grassland and woodland areas. Future trend projections indicate divergent persistence patterns between plain and desert grasslands. Drought response analysis identified a dominant 3-month lag effect, with forests showing greater drought resistance and longer response lags compared to croplands (1.2 months longer, p=0.03). The ecosystem maintains high resilience, regulated by the interactive effects of vegetation type, irrigation practices, and climate gradients. These findings establish a mechanistic framework for understanding carbon cycling processes in arid lands under climate stress, providing scientific basis for global dryland ecosystem management.