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Changes in belowground biomass dominate soil phosphorus availability in grazed grasslands

文献类型： 外文期刊

作者： Li, Shucheng 1 ; Jin, Ke 2 ; Tang, Shiming 2 ; Chen, Hongyang 3 ; Sun, Hong 5 ;

作者机构： 1.Anhui Sci & Technol Univ, Coll Agr, Fengyang 233100, Peoples R China

2.Chinese Acad Agr Sci, Inst Grassland Res, Hohhot 010010, Peoples R China

3.Northeast Forestry Univ, Sch Forestry, Harbin 150040, Peoples R China

4.Anhui Prov Int Joint Res Ctr Forage Biobreeding, Chuzhou 233100, Peoples R China

5.Guizhou Univ, Coll Anim Sci, Guiyang 550025, Guizhou, Peoples R China

关键词： Grazing; Grassland; Soil phosphorus; Meta-analysis; Climate change

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.4； 五年影响因子：6.8 ）

ISSN： 0167-8809

年卷期： 2025 年 394 卷

页码：

收录情况： SCI

摘要： Soil phosphorus (P) plays a pivotal role in the functional regulation of global grassland ecosystems, and understanding its response to grazing is essential for predicting the feedback mechanisms between potential grazing effects and nutrient balance in grasslands. However, it remains unclear how grazing regulates the soil P content and the underlying mechanisms in global grasslands. In this study, we performed a meta-analysis of 1879 observations from 122 studies (1954-2024) to evaluate grazing-induced changes in soil P content. Our results showed that grazing, especially heavy grazing, significantly exacerbated the loss of soil P content in grassland ecosystems. Moreover, the reduction in soil P content was more pronounced under long-term (> 5 years), higher-temperature (> 5 degrees C), and higher-precipitation (> 400 mm) conditions. Additionally, at all grazing intensity levels, we observed interactive effects among grazing intensity and duration, mean annual temperature, mean annual precipitation on soil P content. More importantly, changes in belowground biomass are considered to be the primary driver factor influencing the P content in grazed grasslands. Our results highlight that enhancing the belowground biomass of grazed grasslands can effectively increase the availability of soil P, thereby promoting the sustainability of grassland ecosystems.

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