Aim Small mammal species richness and relative abundance vary along elevational gradients, but there are different patterns that exist. This study reports the patterns of distribution and abundance of small mammals along the broader elevational gradient of Mt. Qilian range.
Location The study was conducted in the Mt. Qilian range, north‐western China, from June to August 2001.
Methods Removal trapping was conducted using a standardized technique at 7 sites ranging between 1600 and 3900 m elevation within three transects. Correlation, regression and graphical analyses were used to evaluate the diversity patterns along this elevational gradient.
Results In total, 586 individuals representing 18 nonvolant small mammal species were collected during 20 160 trap nights. Species composition was different among the three transects with 6 (33%) of the species found only within one transect. Elevational distribution and relative abundance of small rodents showed substantial spatial variation, with only 2 species showing nonsignificant capture frequencies across elevations. Despite these variations, some general patterns of elevational distribution emerged: humped‐shape relationships between species diversity and elevation were noted in all three transects with diversity peaks at middle elevations. In addition, relative abundance was negatively correlated with elevation.
Conclusions Results indicate that maximum richness and diversity of nonvolant small mammals occurred at mid‐elevations where several types of plants reached their maximum diversity and primary productivity, and where rainfall and humidity reached a maximum. It is demonstrated that the mid‐elevation bulge is a general feature of at least a large portion of the biota on the Mt. Qilian range.
Gel casting foam is a novel method which was developed in latter 1990s for the fabrication of porous materials with regular round pores and a relatively high flexural strength. It also has the advantages of simplicity in degreasing processing and short production cycle. However, the gelating system used in this method commonly contains acrylatnide, which is toxic and sensitive to oxygen, due to which, foaming and polymerization of the substance have to be performed in an oxygen-free environment. In this work, we use agar as the gelating agent in replace of acrylatnide to prepare alumina macroporous ceramics. The effects of foaming speed, foaming time, gelating time and valeric acid on the pore diameter of the sample were investigated. Results show that the average pore diameter increasing with the foaming speed, but decreasing with the increasing foaming time. Moreover, the addition of valeric acid reduces the bubble size during foaming and increase the stability of the foams. By controlling the foaming and gelating conditions, we achieve alumina macroporous ceramics with regular round pores of over 100μm by this method.
The paper is focused on these thematic data index construction, and puts forward a kind of category data indexes for rapid queries for urbanization thematic data index. The corresponding metadata tables could be constructed as non-spatial data are stored in the binary format. This aim is to classify the data by the metadata information and to establish the classified index respectively for the attribute data. The experiments confirmed that the proposed the category index can create urban thematic data index, and can quickly query attribute data needed.
How to enrich the contents of the " low-carbon eco-city " in the general city planning level , how to the implement the development goals into actions are the major issues of promoting the realization of the goal of low-carbon eco-city by the general city planning . This paper discusses about this, proposes that we should view low-carbon eco-city planning rationally, identifies the impetus of practical low-carbon eco-city planning, and mainly discourses the practical approaches on the compilation level of general low-carbon eco-city planning.
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