Knowledge Management System of Northwest Institute of Plateau Biology, CAS
Differences in background environment and fertilization method mediate plant response to nitrogen fertilization in alpine grasslands on the Qinghai-Tibetan Plateau | |
He, Shun; Du, Jianqing; Wang, Yanfen; Cui, Lizhen; Liu, Wenjing; Xiao, Yifan; Ran, Qinwei; Li, Linfeng; Zhang, Zuopei; Tang, Li; Hu, Ronghai; Hao, Yanbin; Cui, Xiaoyong; Xue, Kai | |
2024 | |
发表期刊 | SCIENCE OF THE TOTAL ENVIRONMENT |
卷号 | 906 |
摘要 | Grassland degradation threatens ecosystem function and livestock production, partly induced by soil nutrient deficiency due to the lack of nutrient return to soils, which is largely ascribed to the intense grazing activities. Therefore, nitrogen (N) fertilization has been widely adopted to restore degraded Qinghai-Tibetan Plateau (QTP) grasslands. Despite numerous field manipulation studies investigating its effects on alpine grasslands, the patterns and thresholds of plant response to N fertilization remain unclear, thus hindering the prediction of its influences on the regional scale. Here, we established a random forest model to predict N fertilization effects on plant productivity based on a meta-analysis synthesizing 88 publications in QTP grasslands. Our results showed that N fertilization increased the aboveground biomass (AGB) by 46.51 %, varying wildly among plant functional groups. The positive fertilization effects intensified when the N fertilization rate increased to 272 kg ha(-1) yr(-1), and decreased after three years of continuous fertilization. These effects were more substantial when applying ammonium nitrate compared to urea. Further, a machine learning model was used to predict plant productivity response to N fertilization. The total explained variance and mean squared residuals ranged from 49.41 to 75.13 % and 0.011-0.058, respectively, both being the highest for grasses. The crucial predictors were identified as climatic and geographic factors, background AGB without N fertilization, and fertilization methods (i.e., rate, form, and duration). These predictors with easy access contributed 62.47 % of the prediction power of grasses' response, thus enhancing the generalizability and replicability of our model. Notably, if 30 % of yak dung is returned to soils on the QTP, the grassland productivity and plant carbon pool are predicted to increase by 5.90-6.51 % and 9.35-10.31 g C m(-2) yr(-1), respectively. Overall, the predictions of this study based on literature synthesis enhance our understanding of plant responses to N fertilization in QTP grasslands, thereby providing helpful information for grassland management policies. |
收录类别 | SCIE |
文献类型 | 期刊论文 |
条目标识符 | http://210.75.249.4/handle/363003/61544 |
专题 | 中国科学院西北高原生物研究所 |
推荐引用方式 GB/T 7714 | He, Shun,Du, Jianqing,Wang, Yanfen,et al. Differences in background environment and fertilization method mediate plant response to nitrogen fertilization in alpine grasslands on the Qinghai-Tibetan Plateau[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2024,906. |
APA | He, Shun.,Du, Jianqing.,Wang, Yanfen.,Cui, Lizhen.,Liu, Wenjing.,...&Xue, Kai.(2024).Differences in background environment and fertilization method mediate plant response to nitrogen fertilization in alpine grasslands on the Qinghai-Tibetan Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,906. |
MLA | He, Shun,et al."Differences in background environment and fertilization method mediate plant response to nitrogen fertilization in alpine grasslands on the Qinghai-Tibetan Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 906(2024). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论