Effects of Litter Additions on Soil Carbon, Nitrogen and Phosphorus Contents and Their Stoichiometric Characteristics in Sagebrush Desert Grassland

doi:10.11733/j.issn.1007-0435.2024.02.013

Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (2): 462-469.DOI: 10.11733/j.issn.1007-0435.2024.02.013

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Effects of Litter Additions on Soil Carbon, Nitrogen and Phosphorus Contents and Their Stoichiometric Characteristics in Sagebrush Desert Grassland

ZHOU Lei¹, SUN Zong-jiu^1,2,3, NIE Ting-ting¹, YU Bing-jie¹, ZHENG Li¹, ZHOU Chen-ye¹

1. College of Grassland Science, Xinjiang Agricultural University, Urumqi, Xinjiang 830052;
2. Xinjiang Key Laboratory of Grassland Resources and Ecology, Urumqi, Xinjiang 830052;
3. Ministry of Education Key Laboratory for Western Arid Region Grassland Resources and Ecology, Urumqi, Xinjiang 830052, China

Received:2023-08-06 Revised:2023-11-18 Online:2024-02-15 Published:2024-03-06

凋落物添加对蒿类荒漠草地土壤碳氮磷含量及其化学计量特征的影响

周磊¹, 孙宗玖^1,2,3, 聂婷婷¹, 于冰洁¹, 郑丽¹, 周晨烨¹

1. 新疆农业大学草业学院, 新疆乌鲁木齐 830052;
2. 新疆草地资源与生态自治区重点实验室, 新疆乌鲁木齐 830052;
3. 西部干旱区草地资源与生态教育部重点实验室, 新疆乌鲁木齐 830052

通讯作者: 孙宗玖,E-mail:nmszj@21cn.com
作者简介:周磊(1996-),男,汉族,新疆乌鲁木齐人,硕士研究生,主要从事草地资源与生态研究研究,E-mail:1042791363@qq.com
基金资助:
新疆维吾尔自治区高校基本科研业务费（XJEDU2022J006）；新疆维吾尔自治区重点实验室开放课题（2022D04003）；国家自然科学基金（32060408）资助

Abstract

Abstract: In order to investigate the effects of litter additions on soil nutrients and stoichiometric ratios,the effects of litter additions on soil organic carbon (SOC),total nitrogen (TN),total phosphorus (TP),and their stoichiometric ratios in Sagebrush desert grassland from 0 to 10 cm were studied by using the method of outdoor incubation in Mason jars. The results showed that stem and leaf mixing promoted litter decomposition,but there was no significant difference in decomposition rates among different amount of the same additives. Soil SOC increased by 10.4% and 15.2% (P<0.05) with the addition of 5 g and 7.5 g of leaves,respectively,compared with the control (CK). Soil TN showed an increasing trend with leaf addition,increasing by 11.9% to 18.4% (P<0.05) compared with CK,while stem and stem-leaf mixing significantly decreased by 7.9% and increased by 37.8% (P<0.05) only at 5 g and 7.5 g additions,respectively. Soil TP increased by 9.8%,14.4%,7.2%,and 7.5% (P<0.05) after 2.5 g of stem and leaf,5 g of stem,and 7.5 g of leaf additions,respectively,compared with CK. 7.2% (P<0.05). Soil C∶N,C∶P,and N∶P were 2.46～3.63,12.40～16.17,and 3.47～5.60,respectively,after the addition of litter,and SOC was positively correlated with C∶P,and TN was positively correlated with N∶P,whereas TN was significantly negatively correlated with C∶N,except for the addition of leaves. Therefore,decomposition of litter is beneficial to soil nutrient recovery in Sagebrush desert,especially leaf litter decomposition is an important source of short-term carbon and nitrogen supplementation in soil.

Key words: Litter, Residual rate, Soil carbon, Nitrogen and phosphorus, Stoichiometric ratio, Sagebrush desert grassland

摘要： 为探究凋落物添加对土壤养分及化学计量比的影响，本研究采用梅森瓶室外培养法，探求凋落物添加种类及添加量对蒿类荒漠草地0～10 cm土壤有机碳（SOC）、全氮（TN）、全磷（TP）及其化学计量比的影响，发现茎叶混合促进了凋落物分解，但同一添加物各添加量间分解速率无显著差异。添加5 g和7.5 g叶后土壤SOC较对照分别增加10.4%，15.2%（P<0.05）。土壤TN随叶添加量增加呈上升趋势，较CK增加11.9%～18.4%（P<0.05），而茎、茎叶混合依次仅在5 g、7.5 g添加量时显著减少7.9%、增加37.8%（P<0.05）。2.5 g茎叶、5 g茎和7.5 g叶添加后土壤TP较CK依次增加9.8%，14.4%，7.2%（P<0.05）。凋落物添加后土壤C∶N，C∶P，N∶P分别为2.46～3.63，12.40～16.17，3.47～5.60，且SOC与C∶P、TN与N∶P均呈正相关，而TN与C∶N除添加叶外均呈显著负相关。因此，凋落物分解有利于蒿类荒漠土壤养分的恢复，尤其是叶凋落物的分解是其土壤碳氮短期补充的重要来源。

关键词: 凋落物, 残留率, 土壤碳氮磷, 化学计量比, 蒿类荒漠草地

CLC Number:

S154.1

ZHOU Lei, SUN Zong-jiu, NIE Ting-ting, YU Bing-jie, ZHENG Li, ZHOU Chen-ye. Effects of Litter Additions on Soil Carbon, Nitrogen and Phosphorus Contents and Their Stoichiometric Characteristics in Sagebrush Desert Grassland[J]. Acta Agrestia Sinica, 2024, 32(2): 462-469.

周磊, 孙宗玖, 聂婷婷, 于冰洁, 郑丽, 周晨烨. 凋落物添加对蒿类荒漠草地土壤碳氮磷含量及其化学计量特征的影响[J]. 草地学报, 2024, 32(2): 462-469.

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Effects of Litter Additions on Soil Carbon, Nitrogen and Phosphorus Contents and Their Stoichiometric Characteristics in Sagebrush Desert Grassland

凋落物添加对蒿类荒漠草地土壤碳氮磷含量及其化学计量特征的影响

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