4.7 Article

Time-Lag Effect of Climate Conditions on Vegetation Productivity in a Temperate Forest-Grassland Ecotone

期刊

FORESTS
卷 13, 期 7, 页码 -

出版社

MDPI
DOI: 10.3390/f13071024

关键词

time-lag effect; vegetation type; soil texture; spatial and temporal heterogeneity

类别

资金

  1. National Key R&D Program of China [2020YFA0608100]
  2. National Natural Science Foundation of China [31901366, 32071843, 32071842, 32101588]

向作者/读者索取更多资源

This study investigates the time-lag effects of precipitation and drought on vegetation net primary productivity (NPP) in the forest-grassland ecotones of Inner Mongolia, China. The results show that NPP has a delayed response to precipitation and drought during the growing season, with different time-lag effects depending on vegetation type and soil texture. The findings highlight the importance of considering time-lag effects in predicting NPP and carbon sinks in temperate semiarid regions.
Climate conditions can significantly alter the vegetation net primary productivity (NPP) in many of Earth's ecosystems, although specifics of NPP-climate condition interactions, especially time-lag responses on seasonal scales, remain unclear in ecologically sensitive forest-grassland ecotones. Based on the Moderate-Resolution Imaging Spectroradiometer (MODIS) and meteorological datasets, we analyzed the relationship between NPP and precipitation, temperature, and drought during the growing season (April-August), considering the time-lag effect (0-5 months) at the seasonal scale in Hulunbuir, Inner Mongolia, China from 2000 to 2018. The results revealed a delayed NPP response to precipitation and drought throughout the growing season. In April, the precipitation in the 4 months before (i.e., the winter of the previous year) explained the variation in NPP. In August, the NPP in some areas was influenced by the preceding 1 similar to 2 months of drought. The time-lag effect varied with vegetation type and soil texture at different spatial patterns. Compared to grass and crop, broadleaf forest and meadow exhibited a longer legacy of precipitation during the growing season. The length of the time-lag effects of drought on NPP increased with increasing soil clay content during the growing season. The interaction of vegetation types and soil textures can explain 37% of the change in the time-lag effect of the NPP response to PPT on spatial pattern. Our findings suggested that preceding precipitation influences vegetation growth at the early stages of growth, while preceding drought influences vegetation growth in the later stages of growth. The spatial pattern of the time lag was significantly influenced by interaction between vegetation type and soil texture factors. This study highlights the importance of considering the time-lag effects of climate conditions and underlying drivers in further improving the prediction accuracy of NPP and carbon sinks in temperate semiarid forest-grassland ecotones.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据