Soil fauna accelerated litter C and N release by improving litter quality across an elevational gradient

被引：9

作者：

Zhang, Li ^{[1
]}

Liu, Jingru ^{[1
]}

Yin, Rui ^{[2
]}

Xu, Zhenfeng ^{[1
]}

You, Chengming ^{[1
]}

Li, Han ^{[1
]}

Wang, Lixia ^{[1
]}

Liu, Sining ^{[1
]}

Xu, Hongwei ^{[1
]}

Xu, Lin ^{[1
]}

Liu, Yang ^{[1
]}

Wang, Yong ^{[1
]}

Tan, Bo ^{[1
]}

机构：

[1] Sichuan Agr Univ, Coll Forestry, Forestry Ecol Engn Upper Reaches Yangtze River Key, Chengdu 611130, Peoples R China

[2] Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China

来源：

ECOLOGICAL PROCESSES | 2023年 / 12卷 / 01期

关键词：

Carbon remaining; Nitrogen remaining; Nitrogen retention; Soil fauna; Elevational gradient; HOME-FIELD ADVANTAGE; FOLIAR LITTER; TERRESTRIAL ECOSYSTEMS; PHOSPHORUS DYNAMICS; LAND-USE; DECOMPOSITION; CLIMATE; NITROGEN; FOREST; LEAF;

D O I：

10.1186/s13717-023-00459-4

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

Background Soil fauna is an important driver of carbon (C) and nitrogen (N) release from decomposing litter in forest ecosystems. However, its role in C and N cycling concerning climate and litter traits remains less known. In a 4-year field experiment, we evaluated the effects of soil fauna on litter C and N release across an elevation gradient (453, 945, 3023, and 3582 m) and litter traits (coniferous vs. broadleaf) in southwestern China. Results Our results showed that N was retained by -0.4% to 31.5%, but C was immediately released during the early stage (156-516 days) of decomposition for most litter species. Soil fauna significantly increased the peak N content and N retention across litter species, but reduced the C/N ratio for certain species (i.e., Juniperus saltuaria, Betula albosinensis, Quercus acutissima, and Pinus massoniana litter), leading to more C and N being released from decomposing litter across the elevation gradient. Contributions of soil fauna to C and N release were 3.87-9.90% and 1.108.71%, respectively, across litter species after 4 years of decomposition. Soil environment and initial litter quality factors caused by elevation directly affected litter C and N release. Changes in soil fauna resulting from elevation and fauna exclusion factors had a direct or indirect impact on C and N release during litter decomposition. Conclusions Our findings suggest that soil fauna promote C and N release from decomposing litter in different magnitudes, mainly controlled by environmental conditions (i.e., temperature and moisture), litter quality (i.e., lignin and cellulose content, and lignin/cellulose), and its diversity across the elevation gradient.

引用

页数：13

共 63 条

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