| 放牧对荒漠草原优势植物叶片养分含量和化学计量特征的影响 |
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| 引用本文： | 放牧对荒漠草原优势植物叶片养分含量和化学计量特征的影响.放牧对荒漠草原优势植物叶片养分含量和化学计量特征的影响[J].畜牧与饲料科学,2021,42(6):56-62. |
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| 作者姓名： | 放牧对荒漠草原优势植物叶片养分含量和化学计量特征的影响 |
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| 作者单位： | 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 010011;内蒙古自治区农牧业科学院,内蒙古 呼和浩特 010031 |
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| 基金项目： | 内蒙古自治区重大科技专项（ZDZX2018020）; 国家自然科学基金项目（31560140,31760143）; 内蒙古自治区科技成果转化项目（2019CG069,2020CG0013）; 国家重点研发计划项目（2016YFC0500504）; 内蒙古农业大学草地资源教育部重点实验室 |
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| 摘 要： | 目的] 阐明荒漠草原优势植物叶片养分含量对不同放牧强度的响应。方法] 在内蒙古短花针茅荒漠草原的放牧样地上设置4个不同放牧强度的处理：对照（CK）、轻度放牧（LG）、中度放牧（MG）和重度放牧（HG）,载畜率分别为0、0.91、1.82、2.71只羊/hm2。于2020年对荒漠草原优势植物短花针茅（Stipa breviflora）、无芒隐子草（Cleistogenes songorica）、银灰旋花（Convolvulus ammannii）和冷蒿（Artemisia frigida）在不同放牧强度下叶片中的C、N、P浓度进行测定,并对其化学计量特征进行计算。结果] 与对照区（CK）相比,重度放牧显著（P<0.05）降低了短花针茅和银灰旋花叶片的C浓度;放牧对短花针茅、无芒隐子草、银灰旋花和冷蒿叶片N含量无显著（P>0.05）影响;中度放牧显著（P<0.05）增加了短花针茅和银灰旋花叶片的P浓度,并显著（P<0.05）降低了冷蒿的P浓度;重度放牧显著（P<0.05）降低了银灰旋花的C∶N,短花针茅、银灰旋花和冷蒿的C∶P,以及短花针茅的N∶P。结论] 放牧改变植物对养分的利用状况,不同植物对相同生境有不同的适应策略。放牧降低荒漠草原优势植物固C能力。长期中度放牧有利于荒漠草原优势植物对N、P的吸收。
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| 关 键 词： | 荒漠草原 优势植物 载畜率 生态化学计量 |
| 收稿时间： | 2021-08-02 |
Effects of Grazing on Leaf Nutrient Content and Stoichiometric Characteristics of Dominant Plants in Desert Steppe |
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| BAI Liu,CUI Yuan-yuan,LIU Zhuo-tong,MEN Xin-yang,HOU Dong-jie,SUN Hai-lian,WANG Zhong-wu.Effects of Grazing on Leaf Nutrient Content and Stoichiometric Characteristics of Dominant Plants in Desert Steppe[J].Animal Husbandry and Feed Science,2021,42(6):56-62. |
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| Authors: | BAI Liu CUI Yuan-yuan LIU Zhuo-tong MEN Xin-yang HOU Dong-jie SUN Hai-lian WANG Zhong-wu |
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| Institution: | 1. Key Laboratory of Grassland Resources of the Ministry of Education/College of Grassland,Resources and Environment,Inner Mongolia Agricultural University,Hohhot 010011,China; 2. Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences,Hohhot 010031,China |
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| Abstract: | Objective] To better understand how dominant plants' leaf nutrient content and stoichiometric characteristics respond to varying grazing intensities in the desert steppe. Method] On the grazing sample plots of Stipa breviflora desert steppe in Inner Mongolia, four treatments with varied grazing intensities were set up: control （CK）, light grazing （LG）, moderate grazing （MG）, and heavy grazing （HG）, with stocking rates of 0, 0.91, 1.82, and 2.71 sheep/hm2 respectively. In the year of 2020, under varying grazing intensities, the concentrations of C, N, and P in leaves of domoinant plants Stipa breviflora, Cleistogenes songorica, Convolvulus ammannii and Artemisia frigida were measured, and their stoichiometric properties were calculated.Result] Compare with CK group, heavy grazing significantly （P<0.05） decreased the leaf C concentration of Stipa breviflora and Convolvulus ammannii. Grazing had no significant （P>0.05） effect on the leaf N content of all four dominant plants tested. Moderate grazing significantly （P<0.05） increased the P concentration in the leaves of Stipa breviflora and Convolvulus ammannii, while significantly （P<0.05） decreased the P concentration of Artemisia frigida. Heave grazing significantly （P<0.05） decreased the C∶N of Convolvulus ammannii, the C∶P of Stipa breviflora, Convolvulus ammannii and Artemisia frigida as well as the N∶P of Stipa breviflora. Conclusion] Grazing alters plants' nutrient utilization. Different plants have different adaptation strategies to the same habitat. Grazing reduces the C fixation capacity of dominant plants in desert steppe. Long-term moderate grazing promotes the absorption of N and P by dominating plants in desert steppe. |
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| Keywords: | desert steppe dominant plants stocking rates ecological stoichiometry |
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