局部实验增温对根田鼠栖息地内斑块利用的影响

Influence of Locally Experimental Warming on Patches Utilization in Root Vole′s Habitat

为探讨局部实验增温所形成的斑块效应对根田鼠栖息地利用的可能影响,通过建立开顶式增温小室模拟全球变暖,采用标志重捕法分别调查了不同放牧强度样地上4种处理内根田鼠的捕获频次。这4种处理分别为实验增温组、剪草模拟放牧组、实验增温兼剪草模拟放牧组以及对照组。研究结果表明:⑴不同的放牧强度对根田鼠的捕获频次没有显著影响;在重度放牧样地上,不论是暖季还是冷季,4种处理内根田鼠的捕获频次间的差异均达到显著水平;在轻度放牧样地上,暖季,4种处理内根田鼠的捕获频次间没有显著差异,而在冷季,这种差异则可达到显著水平(P<0 05)。⑵增温小室的建立所形成的隐蔽效应对根田鼠的栖息地选择并没有显著影响,剪草处理对根田鼠的栖息地选择也没有影响,在暖季,局部实验增温对根田鼠的栖息地选择并无影响;在冷季,实验增温组与对照组间的差异显著(P<0 05),而实验增温兼剪草模拟放牧组与剪草模拟放牧组间无明显差异。结果表明,在暖季,局部实验增温对根田鼠的栖息地选择不存在明显影响,而在冷季,这种影响在实验增温组与对照组间达到显著水平,而实验增温兼剪草模拟放牧组与剪草模拟放牧组间则不明显。

To discuss the influence of patch effect of locally experimental warming (EW) on root voles' habitat choice, using top open chambers (TOC) to simulate global warming, the root vole's captured frequencies in 4 treatments in different grazing-intensity plots were investigated by mark-recapture method. The four treatments included EW, cut grass similating grazing(CUT),EW & CUT(EWC),and control (CK). The results showed that: (1)There was no influence of different grazing intensities on root vole's captured frequencies (P> 0.05),but among 4 treatments in High Grazing Meadow (HGM), the differences were significant during both warm or cold seasons (P < 0.05). In Low Grazing Meadow (LGM), it was not significant in warm season (P > 0.05), however, it was evident during cold one (P<0.05).(2)There were no significant influence of the ulterior effect of warming chambers foundation on habitat selection of root vole,cut grass treatment on habitat choice of root vole had also no effect. In warm season, Locally experimental warming(LEW) had no effect on root vole's habitat choice (P>0.05);In cold season, there were significant difference of EW and CK(P<0.05),but EWC and CUT had no difference.The results indicated that LEW had no influence on root vole's habitat choice in warm season. In cold season, this effect was significant between EW and CK, but it was not significant between EWC and CUT.