Nitrogen and water addition alters species diversity and interspecific relationship in a desert grassland
Nitrogen and water addition alters species diversity and interspecific relationship in a desert grassland
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DOI：
10.1016/j.scitotenv.2023.168386
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发表时间：
2023-11-15
影响因子：
9.8
通讯作者：
An，Hui
中科院分区：
文献类型：
--
作者：
Du，Zhongyu;Zhang，Xinwen;An，Hui
Water and nitrogen (N) often affect plant species diversity and interspecific relationship among plant populations in global terrestrial ecosystems. However, the effects of water and N addition on plant diversity and interspecific relationship remain poorly understood. In the study, we designed a three-year field experiment in a desert grassland to assess the effect of increased water (natural +50 %) and N addition (10 g·N·m−2·a−1) on plant diversity and interspecific relationship. Our results showed that the alpha diversity was significantly changed under increased water (W), N addition (N), and water plus N addition (WN). The species richness was decreased significantly on year scales (10 %–27 %), whereas the Pielou index first increased and then decreased over three years and was significantly affected by the interaction between increased water and N addition. The total and pairwise beta diversity were significantly increased by N addition, the community was mainly caused by the turnover component after N addition, especially in 2019 and 2020 (16.6 % and 9 %, respectively). There were significant negative associations among overall populations and dominant populations under N addition, especiallyStipa bungeanaandGypsophiladavurica,Gypsophila davuricaandOxytropisacemose,Artemisiadalai-lamae,andHaplophyllumdauricum. Our findings suggested that plant community structure and composition changes may be due to competition for resources among dominant populations and the turnover component under increased water and N addition, which should be considered in ecosystem management.
