| 引用本文: | 李 佳,魏新成,吕 慧,等.地下水埋深和林分结构对胡杨林下草本植物多样性的影响[J].灌溉排水学报,2025,44(1):82-88. |
| LI Jia,WEI Xincheng,LYU Hui,et al.地下水埋深和林分结构对胡杨林下草本植物多样性的影响[J].灌溉排水学报,2025,44(1):82-88. |
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| 摘要: |
| 【目的】阐明地下水埋深、林分结构和土壤理化因子对胡杨林下草本植物多样性的影响及其相对作用。【方法】以额济纳绿洲胡杨林3个代表性生境为研究对象，基于胡杨林下草本植物多样性、地下水埋深和土壤理化性状，解析胡杨林下草本植物多样性的主要影响因素及其作用。【结果】①草本植物物种丰富度和Shannon-Wiener指数与地下水埋深、平均胸径和土壤全氮量显著负相关，但与林分密度和土壤含水率显著正相关。②地下水埋深、林分结构和土壤含水率共同调控着草本植物多样性，三者协同解释了胡杨林下草本植物群落物种丰富度和Shannon-Wiener指数37.60%和48.60%的变异。③土壤含水率单独解释了草本植物群落物种丰富度和Shannon-Wiener指数24.05%和23.89%的变异，是胡杨林下草本植物多样性主导因素。④地下水埋深单独解释了草本植物群落物种丰富度和Shannon-Wiener指数11.14%和12.36%的变异；同时，地下水埋深既可以直接影响草本植物多样性，也可以通过影响土壤含水率来间接影响草本植物多样性。⑤平均胸径直接影响草本植物多样性，但林分密度主要通过影响土壤含水率间接影响草本植物多样性。【结论】地下水埋深和林分结构通过调控土壤含水率决定了胡杨林下草本植物多样性的维持。 |
| 关键词: 胡杨林；草本植物；物种多样性；地下水埋深；林分结构；土壤含水率 |
| DOI：10.13522/j.cnki.ggps.2024224 |
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| Influence of groundwater depth and stand structure on diversity of the understory herbaceous plants in Populus euphratica forests |
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LI Jia, WEI Xincheng, LYU Hui, MA Wanfei, LI Jingwen, WANG Jianming
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1. Alashan League Ecological Environment Comprehensive Service Center, Alxa League 750306, China; 2. Ejina Banner State-Owned Forest Farm, Alxa League 735499, China; 3. Ejina Forestry and Grassland Bureau Comprehensive Support Center,
Alxa League 735499, China; 4. Ejina Water Authority, Alxa League 735400, China;
5. School of Ecology Nature Conservation, Beijing Forestry University, Beijing 100083, China
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| Abstract: |
| 【Objective】Populus euphratica is widely grown in Xinjiang, Northwestern China. The growth and development of its understory herbaceous plants are influenced by various factors. This paper investigates how groundwater depth, soil moisture, and the stand structure affect the biodiversity of these herbaceous plants.【Method】The analysis was based on data on diversity of the understory plants, groundwater depth, and soil physical properties collected from three representative Populus euphratica forests in the Ejina Oasis.【Result】① The richness and Shannon-Wiener diversity index of the herbaceous plants were negatively correlated with groundwater depth, stem diameter at the breast height (DBH), and soil nitrogen content, while they were positively correlated with stand density and soil moisture. ② Groundwater depth, stand structure, and soil moisture collectively explained 37.60% and 48.60% of the variation in species richness and the Shannon-Wiener index, respectively, indicating that these factors interact to shape the diversity of the understory herbaceous plants. ③ Soil moisture was the dominant driver, explaining 24.05% and 23.89% of the variation in species richness and the Shannon-Wiener index, respectively, and playing a key role in shaping the plant diversity. ④ Groundwater depth explained 11.14% and 12.36% of the variation in species richness and the Shannon-Wiener index, respectively, influencing the diversity both directly and indirectly through its regulation of stand structure and soil moisture. ⑤ DBH directly impacted species diversity, while stand density affected the diversity indirectly by altering soil moisture.【Conclusion】Groundwater depth and stand structure regulate the diversity of understory herbaceous plants primarily through their effects on soil moisture. These findings highlight the integrated roles of hydrology, stand structure, and soil physical properties in shaping the biodiversity of the herbaceous vegetation in the Populus euphratica forests in arid regions. |
| Key words: Populus euphratica forests; herbs; species diversity; groundwater depth; stand structure; soil moisture |
