The influence of geomorphological heterogeneity on biodiversity II. A landscape perspective
The influence of geomorphological heterogeneity on biodiversity II. A landscape perspective
复制标题
DOI：
10.1046/j.1523-1739.1998.96237.x
复制
发表时间：
1998-04-01
影响因子：
6.3
通讯作者：
August, PV
中科院分区：
文献类型：
--
作者：
Nichols, WF;Killingbeck, KT;August, PV
在26个罗得岛奥杜邦避难所的规模从1.4到58.6公顷的地貌异质性的影响进行了研究，维管植物物种丰富度。非生物异质性指数反映了空间变化的坡度，方面，和土壤排水计算从现有的数据库中的地理信息系统。在排除避难所大小对生物多样性和地貌异质性的影响后，维管植物物种丰富度与地貌异质性高度相关。仅土壤排水类的多样性就占总植物物种丰富度方差的50%以上（r（2）= 0.53，p < 0.001），并与所研究的11种生活型中的10种植物的物种丰富度显著相关。当两个避难所被认为是数学和生物学的离群值从回归分析中删除，土壤排水异质性占65%以上的总植物物种丰富度的方差（r（2）= 0.67，P < 0.001）。地形异质性、坡度异质性和所有三种地貌异质性指标的综合指数与总植物丰富度的相关性均低于土壤排水异质性，但它们在预测本地木本物种丰富度方面（r（2）= 0.23-0.45，p < 0.05）都比土壤排水异质性（r（2）= 0.08，P > 0.05）。在逐步多元回归分析中，土壤排水异质性和避难所大小解释了物种丰富度变化的66%（p < 0.001）（土壤排水异质性，部分r（2）= 0.39避难所大小，部分r（2）= 0.27）。这些结果明确支持的宗旨，地貌异质性起着重要作用，在确定物种丰富度。由于生物多样性和非生物多样性在景观尺度上错综复杂地联系在一起，保护地貌异质性可能是保护生物多样性的有效策略。
The influence of geomorphological heterogeneity on vascular plant species richness was studied in 26 Rhode Island Audubon refuges ranging in size from 1.4 to 58.6 ha. Indices of abiotic heterogeneity reflecting spatial variation in slope, aspect, and soil drainage were calculated from extant databases in a geographic information system. After removing the influence of refuge size on both biotic diversity and geomorphological heterogeneity, vascular plant species richness was found to be highly related to geomorphological heterogeneity. Diversity in soil drainage class alone accounted for more than 50% of the variance in total plant species richness (r(2) = 0.53, p < 0.001) and was significantly related to the species richness of 10 of the 11 life-form classes of plants studied. When two refuges considered to be mathematical and biological outliers were removed from the regression analysis, soil drainage heterogeneity accounted for more than 65% of the variance in total plant species richness (r(2) = 0.67, P < 0.001). Aspect heterogeneity, slope heterogeneity, and the composite index of all three measures of geomorphological heterogeneity were each less related to total plant richness than soil drainage heterogeneity alone, but they were all more effective at predicting richness of native woody species (r(2) = 0.23-0.45, p < 0.05) than soil drainage heterogeneity (r(2) = 0.08, p > 0.05). In a stepwise multiple regression analysis, soil drainage heterogeneity and refuge size explained 66% (p < 0.001) of the variation in species richness (soil drainage heterogeneity, partial r(2) = 0.39 refuge size, partial r(2) = 0.27). These results explicitly support the tenet that geomorphological heterogeneity plays a major role in determining species richness. Because biotic and abiotic diversity were intricately linked at the scale of the landscape, conservation of geomorphological heterogeneity may be an effective strategy for conserving biodiversity.