4.7 Article

Patterns of nitrogen and phosphorus pools in terrestrial ecosystems in China

Journal

EARTH SYSTEM SCIENCE DATA
Volume 13, Issue 11, Pages 5337-5351

Publisher

COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/essd-13-5337-2021

Keywords

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Funding

  1. National Key Research and Development Program of China [2019YFA0606602]
  2. National Natural Science Foundation of China [32025025, 31770489, 31988102]
  3. Strategic Priority Research Programme of the Chinese Academy of Sciences [XDA05050000]

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This study mapped the distribution of nitrogen and phosphorus densities and concentrations in different ecosystems across China for the first time, revealing that nitrogen and phosphorus in forest, shrubland, and grassland ecosystems are primarily stored in the soil, with lower levels found in leaves, roots, and litter. The data provided by this study could potentially enhance current earth system models and large-scale research on ecosystem nutrients.
Recent increases in atmospheric carbon dioxide (CO2) and temperature relieve their limitations on terrestrial ecosystem productivity, while nutrient availability constrains the increasing plant photosynthesis more intensively. Nitrogen (N) and phosphorus (P) are critical for plant physiological activities and consequently regulate ecosystem productivity. Here, for the first time, we mapped N and P densities and concentrations of leaves, woody stems, roots, litter, and soil in forest, shrubland, and grassland ecosystems across China based on an intensive investigation at 4868 sites, covering species composition, biomass, and nutrient concentrations of different tissues of living plants, litter, and soil. Forest, shrubland, and grassland ecosystems in China stored 6803.6 Tg N, with 6635.2 TgN (97.5 %) fixed in soil (to a depth of 1 m) and 27.7 (0.4 %), 57.8 (0.8 %), 71.2 (1 %), and 11.7 TgN (0.2 %) in leaves, stems, roots, and litter, respectively. The forest, shrubland, and grassland ecosystems in China stored 2806.0 Tg P, with 2786.1 Tg P (99.3 %) fixed in soil (to a depth of 1 m) and 2.7 (0.1 %), 9.4 (0.3 %), 6.7 (0.2 %), and 1.0 Tg P (< 0.1 %) in leaves, stems, roots, and litter, respectively. Our estimation showed that N pools were low in northern China, except in the Changbai Mountains, Mount Tianshan, and Mount Alta, while relatively higher values existed in the eastern Qinghai-Tibetan Plateau and Yunnan. P densities in vegetation were higher towards the southern and north-eastern part of China, while soil P density was higher towards the northern and western part of China. The estimated N and P density and concentration datasets, Patterns of nitrogen and phosphorus pools in terrestrial ecosystems in China (https://doi.org/10.5061/dryad.6hdr7sqzx), are available from the Dryad digital repository (Zhang et al., 2021). These patterns of N and P densities could potentially improve existing earth system models and large-scale research on ecosystem nutrients.

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