Effects of Sheep Grazing and Nitrogen Addition on Dicotyledonous Seedling Abundance and Diversity in Alpine Meadows

被引:0
|
作者
Dong, Huanhuan [1 ,2 ,3 ]
Ma, Yuqi [4 ]
Wang, Zuoyi [1 ,3 ]
Yang, Yuan [1 ,3 ]
Zhang, Longxin [1 ,3 ]
Yin, Xin [3 ]
Li, Honglin [1 ]
Li, Lanping [1 ]
Zhou, Huakun [2 ]
Ma, Zhen [2 ,5 ,6 ]
Zhang, Chunhui [1 ,6 ]
机构
[1] Qinghai Univ, State Key Lab Plateau Ecol & Agr, Xining 810016, Peoples R China
[2] Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Restorat Ecol Cold Reg Qinghai, Xining 810008, Peoples R China
[3] Qinghai Univ, Coll Ecoenvironm Engn, Xining 810016, Peoples R China
[4] Qinghai Normal Univ, Coll Life Sci, Xining 810016, Peoples R China
[5] Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810008, Peoples R China
[6] Chinese Acad Sci, Northwest Inst Plateau Biol, Qinghai Haibei Natl Field Res Stn Alpine Grassland, Xining 810008, Peoples R China
来源
NITROGEN | 2024年 / 5卷 / 02期
基金
中国国家自然科学基金;
关键词
annual net primary productivity; litter; photosynthetically active radiation; vegetation diversity; seedling regeneration; PLANT-SPECIES RICHNESS; LITTER DECOMPOSITION; COMMUNITY; GERMINATION; LIGHT; FERTILIZATION; AVAILABILITY; REGENERATION; BIODIVERSITY; GRASSLANDS;
D O I
10.3390/nitrogen5020032
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Seedling is a crucial stage in the growth and development of plants, and the expansion and persistence of plant populations can be achieved through seed regeneration. Sheep grazing, fertilization, light, soil moisture, vegetation diversity and biomass, and litter all have potential impacts on species regeneration. We measured vegetation diversity, annual net primary productivity (ANPP), litter, ground photosynthetically active radiation (PAR), and soil moisture of alpine meadows under sheep grazing and nitrogen addition treatments, and studied their effects on the dicotyledonous seedling abundance and diversity using linear regression models (LMs) and structural equation models (SEMs). We found that sheep grazing reduced ANPP, increased vegetation diversity and PAR, and decreased soil moisture. Fertilization increased ANPP and litter, decreased vegetation diversity and PAR, but had no effect on soil moisture. Sheep grazing and fertilization both reduced the abundance of dicotyledonous seedlings, and simultaneously fertilization can reduce the diversity of dicotyledonous seedlings, while sheep grazing had no effect on the diversity of dicotyledonous seedlings. LMs showed that vegetation diversity, ANPP, and litter, rather than light and soil moisture, affected dicotyledonous seedling abundance and diversity. SEMs revealed that sheep grazing and fertilization indirectly influenced seedling regeneration through vegetation diversity rather than ANPP and litter. Our research will increase our understanding of the dicotyledonous plant regeneration process in alpine grasslands and facilitate the development of strategies for management and protection of alpine grassland.
引用
收藏
页码:498 / 508
页数:11
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