Soil burial has a greater effect on litter decomposition rate than nitrogen enrichment in alpine grasslands

doi:10.1093/jpe/rtab044

J Plant Ecol ›› 2021, Vol. 14 ›› Issue (6): 1047-1059 .DOI: 10.1093/jpe/rtab044

• Research Articles • Previous Articles Next Articles

Soil burial has a greater effect on litter decomposition rate than nitrogen enrichment in alpine grasslands

Yuan Su^1,2,3, Jiajia Le^1,2,3, Xiaofei Ma^1,3,4, Xiaolong Zhou⁵, Yunxin Zhang^1,2,3, Yanming Gong^1,2, Wenxuan Han^1,4, Kaihui Li^1,2,4,* and Xuejun Liu^1,6,*

¹ State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China, ² Bayinbuluk Grassland Ecosystem Research Station, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Bayinbuluk 841314, China, ³ University of Chinese Academy of Sciences, Beijing 100049, China, ⁴ Chinese Academy of Sciences Research Center for Ecology and Environment of Central Asia, Urumqi 830011, China, ⁵ Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, Xinjiang, China, ⁶ Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China

^*Corresponding author. E-mail: likh@ms.xjb.ac.cn (K.L.); liu310@cau.edu.cn (X.L.)

Received:2020-12-01 Revised:2021-02-01 Accepted:2021-04-06 Online:2021-04-26 Published:2021-12-01

Abstract

Abstract:

Aims

Litter is frequently buried in the soil in alpine grasslands due to grassland degradation, serious rodent infestation and frequent strong winds. However, the effects of various litter positions on litter decomposition rates and nutrient dynamics under nitrogen (N) enrichment in such areas remain unknown.

Methods

A field experiment was performed in the alpine grasslands of northwest China to investigate the influence of litter position (surface, buried in the soil and standing) and N enrichment on litter decomposition, using data from two dominant grass species (Festuca ovina and Leymus tianschanicus) in control and N-enriched plots.

Important Findings

Litter decomposition rates were much faster in buried litter and slower in standing litter than in surface litter. N enrichment significantly affected litter quality and then influenced decomposition. But no significant differences in litter mass remaining were observed between control and N-enriched soil burial. These results indicated that N enrichment significantly affected litter decomposition by changes in litter quality. In addition, all litter exhibited net carbon (C) and phosphorus (P) release regardless of treatments. Litter exhibited net N accumulation for litter from the control plots but showed N release for litter from N enrichment plots. These suggested that litter decomposition can be limited by N and N enrichment influenced N cycling of litter. Current study presented direct evidence that soil buried litter exhibited faster mass loss and C release, and that soil burial can be a candidate explanation why litter decomposes faster than expected in dryland.

Key words: alpine grassland, nitrogen enrichment, litter position, litter decomposition, leaf litter traits, nutrient release

摘要：
高寒草地土壤掩埋对凋落物分解速率的影响大于氮素富集
由于高寒草地退化、鼠害严重、大风频繁等原因，凋落物被频繁掩埋在土壤中。但凋落物的位置变化和氮富集对高寒草原凋落物分解速率和养分动态影响的认识尚不清楚。为了研究凋落物位置变化(地表、掩埋10 cm和悬空60 cm)和氮富集对高寒草原优势植物凋落物分解的影响，本研究依托2009年在新疆天山巴音布鲁克高寒草原设置的长期模拟氮沉降研究平台，以对照和氮富集处理样方的优势植物羊茅(Festuca ovina)和赖草(Leymus tianschanicus)凋落物为试验材料，测定分解过程中凋落物质量损失和碳氮磷含量的变化特征。研究结果表明，掩埋凋落物分解速率显著快于地表凋落物，悬空处理凋落物分解速率慢于地表凋落物。氮富集显著影响凋落物质量，进而影响凋落物分解。而凋落物质量残留在对照与氮富集土壤掩埋之间无显著差异。这些结果表明，氮富集通过凋落物质量而不是通过土壤环境因素，影响短期凋落物分解。不同处理的所有试验凋落物均有碳和磷的释放现象。对照处理的凋落物，凋落物氮以累积为主，而氮富集处理的凋落物，凋落物氮以释放为主。这表明凋落物分解可能受到氮元素限制，氮富集改变了凋落物分解调控的氮循环过程。本研究提供了直接证据，掩埋处理的凋落物有更快的质量损失和碳元素释放，土壤掩埋是旱地凋落物分解速率比模型预测的快的一个候选解释。

关键词: 高寒草地, 氮富集, 凋落物位置, 凋落物分解, 凋落物质量, 养分释放

Yuan Su, Jiajia Le, Xiaofei Ma, Xiaolong Zhou, Yunxin Zhang, Yanming Gong, Wenxuan Han, Kaihui Li and Xuejun Liu. Soil burial has a greater effect on litter decomposition rate than nitrogen enrichment in alpine grasslands[J]. J Plant Ecol, 2021, 14(6): 1047-1059.

[1]	Mingli Ding, Yao Wei, Yuzhang Li, Jianyu Ma, Jingya Zhang, Jiangqin Song, Huiying Liu, Hao Wang, Zhenhua Zhang. Trait-reproductive allocation pathways of different flowering groups under seasonal drought in alpine meadows [J]. J Plant Ecol, 2026, 19(3): 1-.
[2]	Ge Hou, Peili Shi, Ning Zong, Jian Sun, Tiancai Zhou, Jialuo Yu, Yangjian Zhang, Lin Jiang, Juntao Zhu. Initial species evenness modulates divergent stability responses to nitrogen enrichment in Tibetan alpine grasslands [J]. J Plant Ecol, 2026, 19(3): 1-.
[3]	Peng Wang , Lei Li , Qiuyan Wang , Yanju Gao , Bo Zhang , Xiangyi Li , Qiang Zeng. Spectral components and plant traits co-regulate litter photodegradation in hyper-arid regions [J]. J Plant Ecol, 2026, 19(2): 1-.
[4]	Jiaojiao Wang, Fei Zang, Ruochun Wang, Fangyuan Huang , Wenfang Zeng, Hu Hao, Chuanyan Zhao. Accumulation and translocation of trace elements in plant-soil systems of the Qilian Mountains grassland under climate warming [J]. J Plant Ecol, 2026, 19(1): 1-.
[5]	Ke Zhang, Feng Zhang, Xian-Qi Zhou, Qing-Pu Wang, Zi-Ying Wang, Sheng-Mei Li, Yao-Ming Li, Shi-Kui Dong. Geographical and climatic drivers of phyllosphere microbiota in alpine grasslands on the Qinghai–Tibetan Plateau [J]. J Plant Ecol, 2026, 19(1): 1-0.
[6]	Dehuang Zhu, Dafeng Hui. Effect of litter quality on soil microbial mechanisms in home-field advantage of litter decomposition in two subtropical forests [J]. J Plant Ecol, 2026, 19(1): 1-.
[7]	Yurui Jiang, Lifeng Wang, Huaibin Wang, Rui Cao, Zhuang Wang, Qin Wang, Weizhong Li, Wanqin Yang. Typhoon-induced litter on lawns and soil surfaces exhibit divergent decomposition patterns [J]. J Plant Ecol, 2026, 19(1): 1-.
[8]	Li-Li Zheng, Ming-Hua Song, Jiao Meng, Yu Guo, Jia-Xing Zu, Wei Xue, Li-Min Zhang, Peter Alpert, Fei-Hai Yu. Soil nutrient heterogeneity shifts functional group composition without altering total biomass in an alpine grassland [J]. J Plant Ecol, 2025, 18(5): 1-35.
[9]	Chunhui Li, Jiguang Feng, Liu Liu, Xu Sun, Jinsheng Li, Zhuangzhuang Qian, Ranran Fu, Qingshui Yu, Biao Zhu, Xiao Tao. Nitrogen addition weakens home-field advantage of litter decomposition by altering soil pH and bacterial communities in a subtropical forest [J]. J Plant Ecol, 2025, 18(5): 1-29.
[10]	Guotai Zhang, Ga Zangjia, Ying Yang, Ci-ren Qu-zong, Yuan Zhang, Wei Mazhang, Cuo Se, Danzeng Quzhen, Jingting Mao, Chengwei Mu, Lan Wang, Shiping Wang, Zhiyong Yang, Tsechoe Dorji. Effects of warming and grazing on resource allocation strategies in alpine grasslands of the Tibetan Plateau: A Meta-analysis [J]. J Plant Ecol, 2025, 18(4): 1-45.
[11]	Qingling Sun, Jiang Zhu, Siyu Zhu, Baolin Li, Jie Zhu, Xiuzhi Chen, Wenping Yuan. An improved growing season index including the maximum temperature and precipitation to predict foliar phenology of alpine grasslands on the Qinghai–Tibetan Plateau [J]. J Plant Ecol, 2025, 18(2): 1-25.
[12]	Shuotian Lai, Björn Berg, Yongxin Lin, Haroon Rashid, Fuzhong Wu, Qiuxia Wu, Qiufang Zhang, Xinying Zhang, Jingjing Zhu, Xiangyin Ni. Chinese fir litter decomposition and its response to global change: a meta-analysis across China’s forests [J]. J Plant Ecol, 2025, 18(2): 1-15.
[13]	Min Zhang, Jun Wen, Xiaoli Wang, Cancan Zhao, Yuan Ma, Yushou Ma, Shixiong Li. Rest-grazing in spring affects the soil microbial community mainly by altering plant diversity [J]. J Plant Ecol, 2025, 18(1): 1-15.
[14]	Siqi Wu, Yanyu Jiang, Ling Ai, Fuzhong Wu, Qiuxia Wu, Xinying Zhang, Jingjing Zhu, Xiangyin Ni. Declines in carbon and nitrogen release from decomposing litter under elevated CO₂ in terrestrial ecosystems [J]. J Plant Ecol, 2025, 18(1): 1-12.
[15]	Tiancai Zhou, Jian Sun, Peili Shi. Mechanism of plant-soil feedback in a degraded alpine grassland on the Tibetan Plateau [J]. J Plant Ecol, 2024, 17(2): 0-rtae025.

Soil burial has a greater effect on litter decomposition rate than nitrogen enrichment in alpine grasslands

HTML

PDF

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments