半干旱草原长期放牧条件下小叶锦鸡儿的繁殖努力

IF 1.1 4区农林科学 Q3 AGRICULTURE, MULTIDISCIPLINARY

Grassland Science Pub Date : 2021-05-03 DOI:10.1111/grs.12320

Lina Xie, Linjing Guan, Hongyu Guo, Weizhong Chen, Zhe Liu, Qingfang Li, Chengcang Ma

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引用次数: 1

摘要

禁牧是草地草本植物保护和恢复的常用方法，而木本扩张是草原的普遍现象。然而，放牧对灌木繁殖的影响尚不清楚。研究了内蒙古半干旱草原长期放牧(0、8、30和34年)对小叶锦鸡儿繁殖努力度的影响。结果表明:8年不放牧显著增加了小叶锦鸡儿花、幼荚、成熟荚和种子的数量(种子数量增加33.5%)，而30 ~ 34年不放牧显著降低了小叶锦鸡儿种子的产量(种子数量减少77.9%和88.1%)。8年不放牧对单花重影响不显著，而30 ~ 34年不放牧显著降低了单花重(31.7%和38.7%)。放牧对每荚种子数无显著影响。8年禁牧显著提高了性分配效率(31.6%)，但对性分配效率无显著影响;然而，30 ~ 34年的禁牧显著降低了性分配(50.4%和70.4%)和性分配效率(55.5%和60.1%)。8年不放牧显著提高了种子重和种子活力(种子重增加18.7%，种子活力指数增加28.7%)，而30 ~ 34年不放牧降低了种子重和种子活力指数(种子重减少14.2%和21.0%，种子活力指数减少9.1%和14.7%)。结果表明，8年的禁牧使小叶锦鸡儿的繁殖努力增加，而30 ~ 34年的禁牧使小叶锦鸡儿的繁殖努力急剧下降。研究表明，长期不放牧限制了草地灌木的扩张，减少了灌木的有性繁殖，从而抑制了灌木种群的增长。

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Reproductive effort of Caragana microphylla under long-term grazing exclusion in a semi-arid grassland

Grazing exclusion is a commonly used method to protect and recover herbaceous plants in grasslands, and woody expansion is a common phenomenon in grasslands. However, the effects of grazing exclusion on shrub reproduction remain poorly understood. We investigated the effects of long-term grazing exclusion (0, 8, 30 and 34 years) on reproductive effort of Caragana microphylla in the semi-arid Inner Mongolia Steppe. Our results showed that the 8-year grazing exclusion significantly increased the number of flowers, juvenile pods, mature pods and seed (seed number increased 33.5%) of C. microphylla, however, the 30- to 34-year grazing exclusion significantly decreased seed production (seed number decreased 77.9% and 88.1%) of C. microphylla. The 8-year grazing exclusion had no significant effect on the single flower weight, while the 30- to 34-year grazing exclusion significantly decreased (31.7% and 38.7%) the single flower weight. The grazing exclusion had no significant effect on the seed number per pod. The 8-year grazing exclusion significantly increased sexual allocation (31.6%), and it had no significant effect on sexual allocation efficiency; however, the 30- to 34-year grazing exclusion significantly decreased the sexual allocation (50.4% and 70.4%) and sexual allocation efficiency (55.5% and 60.1%). The 8-year grazing exclusion significantly increased seed weight and seed vigor (seed weight increased 18.7%, seed vigor index increased 28.7%), whereas the 30- to 34-year grazing exclusion decreased these indexes (seed weight decreased 14.2% and 21.0%, seed vigor index decreased 9.1% and 14.7%). These results indicated that the 8-year grazing exclusion increased reproductive effort of C. microphylla, while the 30- to 34-year grazing exclusion sharply decreased the reproductive effort of this shrub species. Our study suggests long-term grazing exclusion limited the expansion of shrubs in grassland by decreasing sexual reproduction and thus inhibiting population growth of shrubs.

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来源期刊

Grassland Science Agricultural and Biological Sciences-Agronomy and Crop Science

CiteScore

2.70

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： Grassland Science is the official English language journal of the Japanese Society of Grassland Science. It publishes original research papers, review articles and short reports in all aspects of grassland science, with an aim of presenting and sharing knowledge, ideas and philosophies on better management and use of grasslands, forage crops and turf plants for both agricultural and non-agricultural purposes across the world. Contributions from anyone, non-members as well as members, are welcome in any of the following fields: grassland environment, landscape, ecology and systems analysis; pasture and lawn establishment, management and cultivation; grassland utilization, animal management, behavior, nutrition and production; forage conservation, processing, storage, utilization and nutritive value; physiology, morphology, pathology and entomology of plants; breeding and genetics; physicochemical property of soil, soil animals and microorganisms and plant nutrition; economics in grassland systems.