生物多样性 ›› 2023, Vol. 31 ›› Issue (10): 23144. DOI: 10.17520/biods.2023144
王健铭1, 雷训1, 冯益明2, 吴波2, 卢琦2, 何念鹏3, 李景文1,*()
收稿日期:
2023-05-08
接受日期:
2023-08-29
出版日期:
2023-10-20
发布日期:
2023-11-30
通讯作者:
*E-mail: lijingwenhy@bjfu.edu.cn
基金资助:
Jianming Wang1, Xun Lei1, Yiming Feng2, Bo Wu2, Qi Lu2, Nianpeng He3, Jingwen Li1,*()
Received:
2023-05-08
Accepted:
2023-08-29
Online:
2023-10-20
Published:
2023-11-30
Contact:
*E-mail: lijingwenhy@bjfu.edu.cn
摘要:
局域取样单元对beta多样性的贡献可用于测度每个局域群落物种组成的生态特异性(ecological uniqueness)。温带荒漠生态系统广泛分布于全球干旱和极端干旱区域, 极易受到气候变化和人类活动的影响。然而目前温带荒漠植物群落生态特异性大尺度地理分布格局及其形成机制的系统研究还很缺乏, 制约着我们对荒漠植物群落多样性维持机制的认知。本文在温带灌木、矮半乔木及草原化灌木荒漠等6个中国温带荒漠区的主要地带性植被类型中设置了948个样方, 通过开展系统的野外调查采样和室内分析, 以及量化每个取样单元对beta多样性的贡献, 并结合土壤和气候变量等环境数据, 探讨了中国荒漠植物群落生态特异性大尺度地理分布格局及其影响因素。结果表明: (1)温带荒漠植物群落生态特异性存在显著的经度、纬度和海拔分布格局, 随着经度增加显著降低, 但随着纬度或海拔的升高呈现出先下降后增加的变化趋势; (2)土壤、气候、群落特征(植物物种丰富度和群落盖度)对植物群落生态特异性都有着显著的单独影响, 植物群落生态特异性随着物种丰富度增加呈先下降后上升的变化趋势; 经度、土壤、气候和植物群落特征共同解释了温带荒漠植物群落生态特异性33.5%的空间变异, 其中气候因子有着更强的单独解释率。上述结果说明环境过滤和中性过程以及其他未知过程共同调控了温带荒漠植物群落的生态特异性大尺度分布格局的形成, 且气候和土壤因素的过滤作用有着重要影响。
王健铭, 雷训, 冯益明, 吴波, 卢琦, 何念鹏, 李景文 (2023) 中国温带荒漠植物群落生态特异性格局及其影响因素. 生物多样性, 31, 23144. DOI: 10.17520/biods.2023144.
Jianming Wang, Xun Lei, Yiming Feng, Bo Wu, Qi Lu, Nianpeng He, Jingwen Li (2023) The ecological uniqueness of plant communities and their determinants across the temperate deserts of China. Biodiversity Science, 31, 23144. DOI: 10.17520/biods.2023144.
图2 不同生活型物种对beta多样性贡献的差异性(平均值 ± 标准误)。不同字母表示不同生活型物种之间存在显著差异(P < 0.05)。
Fig. 2 Difference in the species contribution to beta diversity (SCBD) among different life forms (mean ± SE). Different letters indicate significant differences among different life forms (P < 0.05).
图3 中国温带荒漠植物群落生态特异性随经度(a)、纬度(b)和海拔(c)的变化趋势
Fig. 3 Trends of the ecological uniqueness of plant communities across the temperate deserts of China along longitude (a), latitude (b) and altitude (c)
变量 Variable | R2 | 斜率 Slope | P |
---|---|---|---|
物种丰富度 Species richness (SR) | 0.044 | US | < 0.0001 |
植物群落盖度 Plant community coverage (PCC) | 0.036 | US | < 0.0001 |
土壤含水量 Soil moisture (SM) | 0.018 | 0.00002 | < 0.0001 |
土壤总氮含量 Soil total nitrogen content (TSN) | 0.039 | 0.00003 | < 0.0001 |
土壤pH值 Soil pH (pH) | 0.080 | US | < 0.0001 |
年均温 Mean annual temperature (MAT) | 0.037 | US | < 0.0001 |
年均降水量 Mean annual precipitation (MAP) | 0.074 | US | < 0.0001 |
降水季节性 Precipitation seasonality (PS) | 0.166 | -0.396 | < 0.0001 |
太阳辐射强度 Solar radiation (SRAD) | 0.123 | US | < 0.0001 |
表1 单个环境因子与植物群落生态特异性的关系
Table 1 Relationship between the ecological uniqueness of plant communities and single environmental variable
变量 Variable | R2 | 斜率 Slope | P |
---|---|---|---|
物种丰富度 Species richness (SR) | 0.044 | US | < 0.0001 |
植物群落盖度 Plant community coverage (PCC) | 0.036 | US | < 0.0001 |
土壤含水量 Soil moisture (SM) | 0.018 | 0.00002 | < 0.0001 |
土壤总氮含量 Soil total nitrogen content (TSN) | 0.039 | 0.00003 | < 0.0001 |
土壤pH值 Soil pH (pH) | 0.080 | US | < 0.0001 |
年均温 Mean annual temperature (MAT) | 0.037 | US | < 0.0001 |
年均降水量 Mean annual precipitation (MAP) | 0.074 | US | < 0.0001 |
降水季节性 Precipitation seasonality (PS) | 0.166 | -0.396 | < 0.0001 |
太阳辐射强度 Solar radiation (SRAD) | 0.123 | US | < 0.0001 |
图4 中国温带荒漠植物群落生态特异性随物种丰富度(a)、降水季节性(b)和太阳辐射强度(c)的变化趋势
Fig. 4 Trends of the ecological uniqueness of plant communities across the temperate deserts of China along species richness (a), precipitation seasonality (b) and solar radiation (c)
图5 不同变量对植物群落生态特异性的相对影响。(a)进入逐步回归模型中各个变量的效应估计值与95%置信区间; (b)经度、土壤和气候、群落特征(物种丰富度和植物群落盖度)的解释率。Longitude: 经度; SR: 物种丰富度; PCC: 植物群落盖度; SM: 土壤含水量; TSN: 土壤总氮含量; pH: 土壤pH值; MAT: 年均温; PS: 降水季节性。**, P < 0.001。
Fig. 5 Relative influence of different variables on the ecological uniqueness of plant communities. (a) Parameter estimates and the associated 95% confidence interval of each variable that enters into final models; (b) The explanation of longitude, soil and climate, community characteristics (species richness and plant community coverage) to the ecological uniqueness of plant communities. SR, Species richness; PCC, Plant community coverage; SM, Soil moisture; TSN, Soil total nitrogen content; pH, Soil pH; MAT, Mean annual temperature; PS, Precipitation seasonality. ***, P < 0.001.
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