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<p>Water-extractable organic matter (WEOM) is recognized as an indispensable pool of soil organic carbon and nutrients in alpine forests, but the controls over soil WEOM quantity and biodegradability have not been well understood in these ecosystems. Here, we collected surface soils (0–20&#xa0;cm depth) from 33 <i>Pinus</i> stands, 55 <i>Picea</i> stands, and 47 <i>Abies</i> stands in Sichuan, Yunnan, and Tibet Provinces, Southwest China, and measured water-extractable organic carbon (WEOC) and total nitrogen (WETN) concentrations, WEOM aromaticity, and WEOM biodegradability in these alpine coniferous forests. The results showed that soil WEOM quantity was mainly influenced by altitude, mean air temperature, tree species, total nitrogen (N), and pH, whereas soil WEOM biodegradability was primarily influenced by SUVA<sub>260</sub> (i.e., WEOM aromaticity). <i>Abies</i> and <i>Picea</i> stands respectively had 84.5% and 56.5% higher WEOC concentration but had 40.0% and 7.7% lower WEOM aromaticity than <i>Pinus</i> stands. Moreover, soil WEOC concentration showed an increasing trend with elevating latitude, altitude, soil organic C concentration, and soil total N concentration, but declined with increasing mean annual temperature and soil pH. After 28&#xa0;days of incubation, <i>Pinus</i> stands (29.4%) had higher soil WEOM biodegradability than both <i>Abies</i> stands (21.1%) and <i>Picea</i> stands (24.2%). Soil WEOM biodegradability exhibited no significant relationships with mean annual temperature, mean annual precipitation, and WEOC:WETN ratio, but significantly correlated with latitude and WEOM aromaticity. Structural equation modeling indicated that both geographic location and tree species significantly influenced the spatial variability of soil WEOM biodegradability through their effects on WEOM aromaticity. These observations clearly indicate that soil WEOM quantity is co-regulated by tree species, climatic factors, and soil properties, and soil WEOM biodegradability is predominantly influenced by geographic location and tree species in alpine coniferous forests of Southwest China.</p>

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Controls over soil water-extractable organic matter quantity and biodegradability in alpine coniferous forests of Southwest China

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Le-Lin Yu,
  • Qi-Tong Wang,
  • Hua-Jun Yin,
  • Rong Mao

摘要

Water-extractable organic matter (WEOM) is recognized as an indispensable pool of soil organic carbon and nutrients in alpine forests, but the controls over soil WEOM quantity and biodegradability have not been well understood in these ecosystems. Here, we collected surface soils (0–20 cm depth) from 33 Pinus stands, 55 Picea stands, and 47 Abies stands in Sichuan, Yunnan, and Tibet Provinces, Southwest China, and measured water-extractable organic carbon (WEOC) and total nitrogen (WETN) concentrations, WEOM aromaticity, and WEOM biodegradability in these alpine coniferous forests. The results showed that soil WEOM quantity was mainly influenced by altitude, mean air temperature, tree species, total nitrogen (N), and pH, whereas soil WEOM biodegradability was primarily influenced by SUVA260 (i.e., WEOM aromaticity). Abies and Picea stands respectively had 84.5% and 56.5% higher WEOC concentration but had 40.0% and 7.7% lower WEOM aromaticity than Pinus stands. Moreover, soil WEOC concentration showed an increasing trend with elevating latitude, altitude, soil organic C concentration, and soil total N concentration, but declined with increasing mean annual temperature and soil pH. After 28 days of incubation, Pinus stands (29.4%) had higher soil WEOM biodegradability than both Abies stands (21.1%) and Picea stands (24.2%). Soil WEOM biodegradability exhibited no significant relationships with mean annual temperature, mean annual precipitation, and WEOC:WETN ratio, but significantly correlated with latitude and WEOM aromaticity. Structural equation modeling indicated that both geographic location and tree species significantly influenced the spatial variability of soil WEOM biodegradability through their effects on WEOM aromaticity. These observations clearly indicate that soil WEOM quantity is co-regulated by tree species, climatic factors, and soil properties, and soil WEOM biodegradability is predominantly influenced by geographic location and tree species in alpine coniferous forests of Southwest China.