| 荒漠草原不同放牧强度下土壤酶化学计量特征的研究 |
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| 引用本文： | 李雅男,李邵宇,史世斌,王占海,张彬,陈恒,赵萌莉. 荒漠草原不同放牧强度下土壤酶化学计量特征的研究[J]. 草地学报, 2022, 30(9): 2239-2248. DOI: 10.11733/j.issn.1007-0435.2022.09.002 |
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| 作者姓名： | 李雅男 李邵宇 史世斌 王占海 张彬 陈恒 赵萌莉 |
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| 作者单位： | 1. 内蒙古农业大学草原与资源环境学院/草地资源教育部重点实验室, 内蒙古 呼和浩特 010019;2. 内蒙古自治区水利科学研究院, 内蒙古 呼和浩特 010051;3. 呼伦贝尔市农牧技术推广中心, 内蒙古 呼伦贝尔 021008;4. 内蒙古赤峰市克什克腾旗农牧局, 内蒙古 赤峰 025350 |
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| 基金项目： | 国家自然科学基金（31861143001）；内蒙古自治区自然科学基金（2020ZD03）；内蒙古自治区科技计划项目（2019ZD008） |
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| 摘 要： | 为探讨不同放牧强度对土壤酶活性及其化学计量比的影响，本研究依托于内蒙古农牧科学研究院长期放牧平台(2004年开始放牧),每个区组内设置4个不同放牧强度：重度(Heavy grazing, HG)、中度(Moderate grazing, MG)、轻度放牧区(Light grazing, LG)和对照区(Contral, CK),各小区放牧羊的数量分别为12,8,4,0只，于2021年5月利用土钻法进行野外取样，室内分析土壤理化性质、土壤微生物生物量、土壤酶活性及其化学计量特征。结果表明：随放牧强度增加，土壤理化性质，养分含量及其化学计量特征发生显著变化(P<0.05)。土壤微生物养分含量及与C(αG、βG)、N(NAG、LAP)、P(ALP)相关的5种酶活性均随放牧强度增加而降低。随放牧轻度增加，向量长度(Vectoe Lengh)和向量夹角(Vectoe Angle)均显著增加，与C、N、P循环相关的5种土壤酶活性及其化学计量比显著降低(P<0.05)。荒漠草原受C、N限制，且放牧强度越大限制越严重。
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| 关 键 词： | 荒漠草原 放牧强度 土壤酶活性 养分限制 |
| 收稿时间： | 2022-04-19 |
Study on Soil Enzyme Stoichiometric Characteristics of Different Grazing Intensities in Desert Steppe |
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| LI Ya-nan,LI Shao-yu,SHI Shi-bin,WANG Zhan-hai,ZHANG Bin,CHEN Heng,ZHAO Meng-li. Study on Soil Enzyme Stoichiometric Characteristics of Different Grazing Intensities in Desert Steppe[J]. Acta Agrestia Sinica, 2022, 30(9): 2239-2248. DOI: 10.11733/j.issn.1007-0435.2022.09.002 |
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| Authors: | LI Ya-nan LI Shao-yu SHI Shi-bin WANG Zhan-hai ZHANG Bin CHEN Heng ZHAO Meng-li |
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| Abstract: | To explore the effects of different grazing intensities on soil enzyme activities and their stoichiometric ratios, and to provide a theoretical basis for the rational utilization of desert grasslands and ecosystem restoration. The study was based on the long-term grazing platform of the Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences (grazing began in 2004), and four different grazing intensities were set up in each district group:heavy grazing, HG, moderate grazing, MG, light grazing area (LG) and control area (Contral, CK), the number of grazing sheep in each community was 12, 8, 4 and 0 respectively, in May 2021, the soil drilling method was used for field sampling, indoor analysis of soil physical and chemical properties, soil microbial biomass, soil enzyme activity and its stoichiometric characteristics.The results showed that soil physicochemical properties, nutrient content and their stoichiometric characteristics changed significantly with the increase of grazing intensity (P < 0.05). Soil microbial nutrient content and the activities of five enzymes related to C (αG, βG), N (NAG, LAP) and P (ALP) were all decreased with the increase of grazing intensity. The vector length (Vectoe Lengh) and vector angle (Vectoe Angle) both increased significantly with the increase of grazing lightness, and the activity of the five soil enzymes was associated with C, N and P cycling and their stoichiometric ratios were decreased significantly (P<0.05). Desert grasslands are C and N limited, and the greater the grazing intensity the more severe the limitation. |
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| Keywords: | Desert grassland Grazing intensity Soil enzyme activity Nutrient limitation |
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