补播苜蓿对退化草地植物群落结构和生产力的影响途径

doi:10.11733/j.issn.1007-0435.2024.01.005

草地学报 ›› 2024, Vol. 32 ›› Issue (1): 46-53.DOI: 10.11733/j.issn.1007-0435.2024.01.005

补播苜蓿对退化草地植物群落结构和生产力的影响途径

郭美琪¹, 郭童天¹, 徐民乐¹, 张英俊^1,2

1. 中国农业大学草业科学与技术学院, 北京 100193;
2. 农业农村部草地管理与合理利用重点实验室, 北京 100193

收稿日期:2023-07-17 修回日期:2023-08-31 出版日期:2024-01-15 发布日期:2024-01-30
通讯作者: 张英俊,E-mail:zhangyj@cau.edu.cn
作者简介:郭美琪(1997-),女,满族,辽宁丹东人,博士研究生,主要从事草地生态与管理方面研究,E-mail:B20213241026@cau.edu.cn
基金资助:
中国科学院战略性先导科技专项（XDA26000000）子课题：呼伦贝尔家庭牧场草畜平衡技术体系研究（XDA26010302）；国家自然科学基金重大项目（32192462）和国家牧草产业技术体系项目（CARS-34）资助

Mechanism of Reseeding Alfalfa Improving Productivity and Plant Community Structure of Degraded Grassland

GUO Mei-qi¹, GUO Tong-tian¹, XU Min-le¹, ZHANG Ying-jun^1,2

1. College of Grassland Science and Technology, China Agricultural University, Beijing 100193, China;
2. Grassland Management and Utilization Laboratory, Ministry of Agriculture and Rural Affair, Beijing 100193, China

Received:2023-07-17 Revised:2023-08-31 Online:2024-01-15 Published:2024-01-30

摘要/Abstract

摘要： 近年来，紫花苜蓿（Medicago sativa L.）和黄花苜蓿（Medicago falcata L.）被广泛选作补播材料，用于修复退化草地。尽管研究表明二者的植物学特征存在差异，但鲜有人关注它们是否会通过不同的方式影响退化草地的生产力。为了探究二者对退化草地的修复效果是否存在差异，并确定影响补播地生产力的限制因素，本研究选取黄花苜蓿和紫花苜蓿作为补播种对退化草甸草原进行了补播，并在隔年对草地植被、土壤理化性质和微生物量进行监测。结果表明，两种苜蓿都可以显著增加退化草地生产力并改善土壤健康状况。然而，紫花苜蓿通过增加土壤铵态氮改变植被群落结构，其补播样地生产力也由土壤速效养分影响；黄花苜蓿通过增加土壤速效磷含量改变植被群落结构，其补播样地生产力由植被群落结构和土壤微生物量共同影响。初步结果表明，黄花苜蓿更适宜在养分贫瘠的退化草地进行补播。此外在选择紫花苜蓿补播时，可以适当施肥以提高补播成功率。

关键词: 补播, 黄花苜蓿, 紫花苜蓿, 植物群落结构, 生产力

Abstract: In recent years, Medicago sativa L. and Medicago falcata L. have been widely chosen as reseeding materials for the restoration of degraded grasslands. Although studies have shown differences in their botanical characteristics, little attention has been given to whether they would have differential effects on the restoration of degraded grasslands. In order to investigate whether there are differences in the productivity of M. sativa L. and M. falcata L. on degraded grasslands, and to determine the limiting factors for successful reseeding, this study selected M. sativa L. and M. falcata L. as reseeding species and conducted a monitoring of vegetation, soil physicochemical properties, and microbial biomass in the following year. The results showed that both alfalfa species significantly increased productivity and improved soil health of degraded grasslands. However, M. sativa L. altered the vegetation community structure by increasing soil ammonium nitrogen, and the productivity of the reseeding plots was influenced by soil available nutrients. M. falcata L. altered the vegetation community structure by increasing soil available phosphorus, and the productivity of the reseeding plots was influenced by both vegetation community structure and soil microbial biomass. Preliminary results suggested that M. falcata L. was more suitable for reseeding in nutrient-poor degraded grasslands. Additionally, when selecting M. falcata L. for reseeding, appropriate fertilization should be applied to improve the success rate of reseeding.

Key words: Reseeding, Medicago falcata L., Medicago sativa L., Plant community structure, Productivity

中图分类号:

S963.22+3.3

郭美琪, 郭童天, 徐民乐, 张英俊. 补播苜蓿对退化草地植物群落结构和生产力的影响途径[J]. 草地学报, 2024, 32(1): 46-53.

GUO Mei-qi, GUO Tong-tian, XU Min-le, ZHANG Ying-jun. Mechanism of Reseeding Alfalfa Improving Productivity and Plant Community Structure of Degraded Grassland[J]. Acta Agrestia Sinica, 2024, 32(1): 46-53.

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补播苜蓿对退化草地植物群落结构和生产力的影响途径

Mechanism of Reseeding Alfalfa Improving Productivity and Plant Community Structure of Degraded Grassland

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