Effects of Nitrogen Addition on Soil Phosphorus Fractions in an Alpine Meadow of Qinghai-Tibet Plateau

doi:10.11733/j.issn.1007-0435.2022.10.022

Acta Agrestia Sinica ›› 2022, Vol. 30 ›› Issue (10): 2721-2728.DOI: 10.11733/j.issn.1007-0435.2022.10.022

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Effects of Nitrogen Addition on Soil Phosphorus Fractions in an Alpine Meadow of Qinghai-Tibet Plateau

HAN Bing¹, GENG Yi-yi¹, DENG Yan-fang², WANG Yu-fei¹, ZHOU Hua-kun³, SHAO Xin-qing¹, LI Zhi-wen⁴

1. College of Grassland Science and Technology, China Agricultural University, Beijing 100193, China;
2. Qilian Mountain National Park Qinghai Service Guarantee Center, Xining, Qinghai Province 810000, China;
3. Northwest Institute of Plateau Biology, Chinese Academy of Science, Key Laboratory of Restoration Ecology of Cold Area in Qinghai Province, Xining, Qinghai Province 810001, China;
4. Agriculture and Animal Husbandry Bureau of Qilian County in Qinghai Province, Xining, Qinghai Province 810400, China

Received:2022-04-11 Revised:2022-05-14 Online:2022-10-15 Published:2022-11-05

氮添加对青藏高原高寒草甸土壤磷组分的影响

韩冰¹, 耿依仪¹, 邓艳芳², 王宇飞¹, 周华坤³, 邵新庆¹, 李芝雯⁴

1. 中国农业大学草业科学与技术学院, 北京 100193;
2. 祁连山国家公园青海服务保障中心, 青海西宁 810000;
3. 中国科学院西北高原生物研究所, 青海省寒区恢复生态学重点实验室, 青海西宁 810001;
4. 青海省祁连县农牧水利科技和乡村振兴局, 青海西宁 810400

通讯作者: 邵新庆,E-mail:shaoxinqing@163.com
作者简介:韩冰(1997-),女,山东邹城人,硕士研究生,主要从事草地恢复生态学研究,E-mail:hbing_edu@163.com;耿依仪(2001-),女,河南许昌人,本科生,主要从事草地恢复生态学研究,E-mail:11peterpan@sina.com
基金资助:
青海省科技厅创新平台建设专项(2020-ZJ-T07)项目资助

Abstract

Abstract: Phosphorus (P) is an essential nutrient that affects plant productivity and ecosystem function in grasslands. In this study,we investigated the responses of soil P fractions to different levels of nitrogen (N) addition (5,10 and 15 g·m^-2 for N5,N10,and N15 respectively) and the mechanisms in an alpine meadow of Haibei,Qinghai-Tibet Plateau (3 100 m). We found that low N addition could improve the availability of soil P,as N5 treatment significantly increased the content of the labile P pool,as well as the content of NaHCO₃-Pi. In contrast,high N addition increased the aboveground biomass and P content in plant shoots,but no significant changes of labile P pool in the soil. Actually,only soil residual-P was significantly decreased under N15 treatment. The further analysis revealed key factors which might affect soil P fractions under N addition,including soil pH,microbial biomass carbon (MBC),and microbial biomass nitrogen (MBN). In conclusion,N additions increased the soil P availability,due to decreased soil pH and increased microbial biomass content in alpine meadows.

Key words: Soil phosphorus pool, Hedley sequential-P-fraction, Soil abiotic and biotic factors, Aboveground biomass of plants

摘要： 磷是一种影响草地植物生产力和生态系统功能的重要养分。本文研究了3个氮添加水平下(5，10和15 g ·m^-2)青藏高原海北高寒草甸(海拔3 100 m)土壤磷组分的变化特征及其主要影响因素。研究表明：N5处理下土壤磷的生物有效性增加。N5处理显著提高了活性磷库的含量，其中NaHCO₃-Pi的含量和比例均显著增加。N15处理下植物生物量和地上部含磷量增加，土壤活性磷含量无显著变化，N15处理下仅土壤残余态磷(Residual-P)显著下降。氮添加下影响土壤磷组分变化的关键因素包括土壤pH值、微生物生物量碳(Microbial biomass carbon,MBC)和微生物生物量氮(Microbial biomass nitrogen,MBN)。在高寒草甸氮添加能够通过降低土壤pH值和增加微生物生物量来提高土壤磷的有效性。

关键词: 土壤磷库, Hedley磷连续提取法, 土壤生物和非生物特性, 植物生物量

CLC Number:

S153.6

HAN Bing, GENG Yi-yi, DENG Yan-fang, WANG Yu-fei, ZHOU Hua-kun, SHAO Xin-qing, LI Zhi-wen. Effects of Nitrogen Addition on Soil Phosphorus Fractions in an Alpine Meadow of Qinghai-Tibet Plateau[J]. Acta Agrestia Sinica, 2022, 30(10): 2721-2728.

韩冰, 耿依仪, 邓艳芳, 王宇飞, 周华坤, 邵新庆, 李芝雯. 氮添加对青藏高原高寒草甸土壤磷组分的影响[J]. 草地学报, 2022, 30(10): 2721-2728.

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Effects of Nitrogen Addition on Soil Phosphorus Fractions in an Alpine Meadow of Qinghai-Tibet Plateau

氮添加对青藏高原高寒草甸土壤磷组分的影响

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