| The influences of reseeding date and mowing prior to reseeding on establishment of alfalfa in Leymus chinensis meadows北大核心CSCD |
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| 引用本文： | 李强,丛山,赵成振,黄迎新,周道玮.The influences of reseeding date and mowing prior to reseeding on establishment of alfalfa in Leymus chinensis meadows北大核心CSCD[J].草业学报,2022,31(11):94-104. |
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| 作者姓名： | 李强 丛山 赵成振 黄迎新 周道玮 |
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| 作者单位： | 1.中国科学院东北地理与农业生态研究所，吉林 长春 130102;2.吉林省草地畜牧重点实验室，吉林 长春 130102;3.中国科学院大学现代农业科学学院，北京 100049 |
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| 基金项目： | 中国科学院战略先导专项(XDA23060403) |
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| 摘 要： | This research studied the effects of sowing date and cutting prior to sowing on establishment of the leguminous forage，alfalfa（Medicago sativa），in a lightly degraded Leymus chinensis meadow and investigated the sowing date×cutting interaction. The factorial experiment comprised four sowing dates（May 1，June 1，July 1，August 1）and cutting treatment（cut or uncut）prior to sowing，and evaluated the establishment performance of alfalfa and the ecological mechanisms related to establishment. It was found that soil moisture during emergence of alfalfa was the greatest when sowing occurred on July 1，and clipping prior to sowing significantly decreased the plant height of L. chinensis during emergence and seedling growth of alfalfa. There was a significant sowing date×cutting interaction effect on alfalfa establishment. Clipping prior to sowing significantly increased the emergence percentage of alfalfa through reducing the plant height of L. chinensis and associated above-and below-ground competition，and the seasonal soil moisture change resulted in a 20% higher（P<0. 05）alfalfa emergence rate when sowing occurred on July 1. With cutting，the number of surviving alfalfa seedlings and seedling survival rate were greatest（83 plants· m?2 and 53%，respectively）when sowing occurred on July 1. For later sowing，owing to the shortened growing time，the development and overwintering survival rates of alfalfa seedlings were significantly reduced. Cutting prior to sowing significantly increased the overwintering rate of alfalfa seedlings through improving their development. In the cutting treatment，the number of overwintered alfalfa seedlings（22 plants·m?2）when sowing was on July 1 was significantly higher than for other reseeding dates. In the second year，a botanical composition measurement showed that clipping prior to reseeding significantly increased the alfalfa biomass within the meadow，and the alfalfa biomass was significantly greater than in other treatments when sowing occurred on July 1 after cutting. Cutting prior to sowing also significantly increased the crude protein content of forage. Based on these research results，normal production practice should include cutting when alfalfa is sown into L. chinensis meadow. Combined with cutting，a sowing date around July 1 is the most favorable for the establishment of alfalfa. © 2022 Editorial Office of Acta Prataculturae Sinica. All rights reserved.
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| 关 键 词： | 草地改良 紫花苜蓿 补播 土壤水分 竞争 |
| 收稿时间： | 2021-11-30 |
| 修稿时间： | 2022-02-24 |
The influences of reseeding date and mowing prior to reseeding on establishment of alfalfa in Leymus chinensis meadows |
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| Qiang LI,Shan CONG,Cheng-zhen ZHAO,Ying-xin HUANG,Dao-wei ZHOU.The influences of reseeding date and mowing prior to reseeding on establishment of alfalfa in Leymus chinensis meadows[J].Acta Prataculturae Sinica,2022,31(11):94-104. |
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| Authors: | Qiang LI Shan CONG Cheng-zhen ZHAO Ying-xin HUANG Dao-wei ZHOU |
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| Institution: | 1.Northeast Institute of Geography and Agroecology，Chinese Academy of Sciences，Changchun 130102，China;2.Jilin Provincial Key Laboratory of Grassland Farming，Changchun 130102，China;3.Modern Agricultural Science Institute，University of Chinese Academy of Sciences，Beijing 100049，China |
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| Abstract: | This research studied the effects of sowing date and cutting prior to sowing on establishment of the leguminous forage， alfalfa （Medicago sativa）， in a lightly degraded Leymus chinensis meadow and investigated the sowing date×cutting interaction. The factorial experiment comprised four sowing dates （May 1， June 1， July 1， August 1） and cutting treatment （cut or uncut） prior to sowing， and evaluated the establishment performance of alfalfa and the ecological mechanisms related to establishment. It was found that soil moisture during emergence of alfalfa was the greatest when sowing occurred on July 1， and clipping prior to sowing significantly decreased the plant height of L. chinensis during emergence and seedling growth of alfalfa. There was a significant sowing date×cutting interaction effect on alfalfa establishment. Clipping prior to sowing significantly increased the emergence percentage of alfalfa through reducing the plant height of L. chinensis and associated above-and below-ground competition， and the seasonal soil moisture change resulted in a 20% higher （P<0.05） alfalfa emergence rate when sowing occurred on July 1. With cutting， the number of surviving alfalfa seedlings and seedling survival rate were greatest （83 plants·m-2 and 53%， respectively） when sowing occurred on July 1. For later sowing， owing to the shortened growing time， the development and overwintering survival rates of alfalfa seedlings were significantly reduced. Cutting prior to sowing significantly increased the overwintering rate of alfalfa seedlings through improving their development. In the cutting treatment， the number of overwintered alfalfa seedlings （22 plants·m-2） when sowing was on July 1 was significantly higher than for other reseeding dates. In the second year， a botanical composition measurement showed that clipping prior to reseeding significantly increased the alfalfa biomass within the meadow， and the alfalfa biomass was significantly greater than in other treatments when sowing occurred on July 1 after cutting. Cutting prior to sowing also significantly increased the crude protein content of forage. Based on these research results， normal production practice should include cutting when alfalfa is sown into L. chinensis meadow. Combined with cutting， a sowing date around July 1 is the most favorable for the establishment of alfalfa. |
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| Keywords: | grassland improvement Medicago sativa reseeding soil moisture competition |
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