Effects of Grazing Intensity on Stoichiomerty of Biological Soil Crusts in the Hilly Loess Plateau region

doi:10.11733/j.issn.1007-0435.2021.11.021

Acta Agrestia Sinica ›› 2021, Vol. 29 ›› Issue (11): 2547-2555.DOI: 10.11733/j.issn.1007-0435.2021.11.021

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Effects of Grazing Intensity on Stoichiomerty of Biological Soil Crusts in the Hilly Loess Plateau region

LI wen¹, MA Xin-xin², MA Ning³, ZHAO Yun-ge², QIAO Yu¹, WANG Peng², SUN Hui³

1. College of Nature Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi Province 712100, China;
3. College of Forestry, Northwest A&F University, Yangling, Shaanxi Province 712100, China

Received:2021-06-15 Revised:2021-08-24 Online:2021-11-15 Published:2021-12-06

放牧强度对黄土丘陵区生物结皮土壤化学计量学特征的影响

李雯¹, 马昕昕², 马宁³, 赵允格², 乔羽¹, 王鹏², 孙会³

1. 西北农林科技大学资源环境学院, 陕西杨凌 712100;
2. 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨陵 712100;
3. 西北农林科技大学林学院, 陕西杨凌 712100

通讯作者: 赵允格,E-mail:zyunge@ms.iswc.ac.cn
作者简介:李雯(1997-),女,硕士研究生,主要从事生物结皮研究,E-mail:liwen8862@163.com*通讯作者Corresponding author,E-mail:
基金资助:
国家自然科学基金项目（41830758，41771318）和中国科学院“西部之光”交叉团队项目-重点实验室合作研究专项（2019）资助

Abstract

Abstract: Guyuan,Dingbian,Shenmu and Ansai were selected as the study areas in the hilly Loess Plateau region. The closed rehabilitated grasslands (G0) that over 20 years old was set as the control,the effects of grazing in different intensity on soil organic carbon (SOC),total nitrogen (TN),total phosphorus (TP) contents and ecological stoichiometry characteristics of biocrusts at 0~2 cm layer soil were investigated in the rehabilitated grasslands of the hilly Loess Plateau region. Three grazing intensity,G1:0~10 goat dung·m^-2,G2:10~20 goat dung·m^-2 and G3:>20 goat dung·m^-2,were included in the study. The results showed that the coverage of moss crusts decreased against the increase of grazing intensity in Ansai. In addition,grazing intensity did not exert significant effects on the coverage and biomass of cyanobacterial and moss crusts in the three other study areas. SOC,TN,N:P and C:P decreased under the intensity of G3 in Shenmu. Moreover,SOC,TN,TP,C:N,N:P and C:P did not show an obvious decrease under different grazing intensities in the three other areas. In general,grazing did not significantly affect the contents of SOC,TN,TP,C:N,N:P and C:P at the biocrustal layer in the hilly Loess Plateau region,and did not significantly affect the contents of SOC,TN,TP and C:N at 0~2 cm soil layer,but in comparison with no grazing,N:P and C:P were decreased at G3. In conclusion,when the grazing intensity was lower than G3,the soil nutrient and ecological stoichiometry characteristics of biological soil crusts were not reduced in the rehabilitated grassland of the hilly loess region.

Key words: Biological soil crusts, Grazing intensity, Stoichiometry, Carbon,nitrogen,phosphorus, Nutrient limitation

摘要： 研究以位于黄土丘陵区的固原、定边、神木、安塞为研究区域，以各区20年以上封禁草地（G0）为对照，分析了不同放牧强度（以羊粪球密度计：G1，0~10个·m^-2；G2，10~20个·m^-2；G3，>20个·m^-2）下生物结皮层及0~2 cm土层土壤有机碳（SOC）、全氮（TN）、全磷（TP）含量及生态化学计量学特征。结果表明：放牧仅降低安塞藓结皮盖度，对各地区的藻结皮盖度和生物量均无影响；从各区域来看，除神木生物结皮层和0~2 cm土层SOC、TN、N：P、C：P在G3下降低以外，其余地区各放牧强度下SOC、TN、TP含量及C：N、N：P、C：P无降低现象；总体来看，各强度放牧对生物结皮层SOC、TN、TP含量及C：N、N：P、C：P无影响，对0~2 cm土层SOC、TN、TP含量及C：N无影响，而N：P、C：P在G3降低。综上，放牧强度小于G3时，黄土丘陵区退耕草地生物结皮土壤养分及生态化学计量学特征无降低现象。

关键词: 生物结皮, 放牧强度, 化学计量, 碳、氮、磷, 养分限制

CLC Number:

LI wen, MA Xin-xin, MA Ning, ZHAO Yun-ge, QIAO Yu, WANG Peng, SUN Hui. Effects of Grazing Intensity on Stoichiomerty of Biological Soil Crusts in the Hilly Loess Plateau region[J]. Acta Agrestia Sinica, 2021, 29(11): 2547-2555.

李雯, 马昕昕, 马宁, 赵允格, 乔羽, 王鹏, 孙会. 放牧强度对黄土丘陵区生物结皮土壤化学计量学特征的影响[J]. 草地学报, 2021, 29(11): 2547-2555.

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Effects of Grazing Intensity on Stoichiomerty of Biological Soil Crusts in the Hilly Loess Plateau region

放牧强度对黄土丘陵区生物结皮土壤化学计量学特征的影响

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