| 水氮添加对黑沙蒿群落植物功能群N、P生态化学计量特征的影响 |
| 摘要点击 230 全文点击 10 投稿时间：2025-03-26 修订日期：2025-05-28 |
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| 中文关键词 降水增加 氮沉降 植物功能群 内稳性 群落结构 |
| 英文关键词 increasing precipitation nitrogen deposition plant functional group homoeostasis community structure |
| DOI 10.13227/j.hjkx.202503297 |
| 作者 | 单位 | E-mail | | 张文瑾 | 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083 | 459318207@qq.com | | 张宇清 | 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083
北京林业大学水土保持国家林业和草原局重点实验室, 北京 100083
北京林业大学林木资源高效生产全国重点实验室, 北京 100083 | zhangyq@bjfu.edu.cn | | 佘维维 | 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083
北京林业大学水土保持国家林业和草原局重点实验室, 北京 100083
北京林业大学林业生态工程教育部工程中心, 北京 100083 | | | 秦树高 | 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083
北京林业大学水土保持国家林业和草原局重点实验室, 北京 100083 | | | 胡朝 | 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083 | |
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| 中文摘要 |
| 研究水氮添加下不同植物功能群氮（N）和磷（P）生态化学计量特征，对于了解降水和氮沉降增加对荒漠生态系统植物群落结构和功能的影响具有重要意义. 以毛乌素沙地黑沙蒿（Artemisia ordosica）群落为对象，基于野外水氮添加试验，分别研究了黑沙蒿、禾草、杂类草和一年生草本的N、P、N∶P及内稳性特征和植物群落结构的变化趋势. 结果表明：①水添加显著增加了黑沙蒿和禾草P，氮添加显著增加了禾草和一年生草本N，显著降低了杂类草P，显著增加了禾草以外其他植物功能群N∶P，水氮交互显著增加了一年生草本N，显著降低了杂类草P，显著增加了杂类草和一年生草本N∶P. ②4种植物功能群的生长均受N限制，持续的水氮添加可能导致其生长限制因子由N转向P. ③与其他功能群相比，禾草的N∶P内稳性相对较低，在水、N充足的环境下更具适应力和竞争力. 生态化学计量特征的研究结果表明，在未来降水和氮沉降持续增加的情景下，黑沙蒿的优势地位将会下降，而禾草的优势地位上升，植物群落结构可能因二者间的竞争力和适应力的不同而发生改变，由以黑沙蒿为主转变为以禾草为主. |
| 英文摘要 |
| Investigating stoichiometric characteristics of nitrogen （N） and phosphorus （P） in different plant functional groups under water and N addition is critical for understanding the impacts of increasing precipitation and N deposition on the structure and function of desert plant communities. A field water and N addition experiment was conducted in an Artemisia ordosica community in the Mu Us Desert. N， P， N∶P ratios， and their corresponding homeostasis among A. ordosica （shrubs）， grasses， forbs， and annuals were analyzed. Shifts in the community structure were also analyzed. Water addition significantly increased P in A. ordosica and grasses， while N addition markedly elevated N in grasses and annuals but reduced P in forbs. N addition also increased N∶P in all functional groups except grasses. Interactive effects of water and N addition notably amplified N in annuals， decreased P in forbs， and elevated N∶P ratios in forbs and annuals. The growth of all four functional groups were N-limited， with potential shifts to P limitation under sustained water and N addition. Grasses exhibited relatively lower N∶P homeostasis compared to other functional groups， conferring greater adaptability and competitive advantage in the environments with sufficient water and N availability. The findings from ecological stoichiometric characteristics reveal that the dominance of A. ordosica would decline with increasing precipitation and N deposition， while that of grasses would increase. The plant community structure may change due to the different competitiveness and adaptability between these plant functional groups， ultimately shifting from A. ordosica-dominated to grass-dominated. |
