高寒草甸融雪斑块对植物刈割强度和高原鼠兔密度的响应

Response of snowmelt patches on alpine meadow tograssland mowing and pika density

摘要:

使用无人机拍摄不同植被刈割强度和高原鼠兔密度下的高寒草甸的融雪图像,解译融雪斑块的分布特征,从地理信息系统中获得每个斑块的面积。根据融雪斑块覆盖率研究刈割强度和鼠兔密度对融雪的影响以及融雪斑块面积与植物群落平均高度、单株植物盖度之间的关系。结果表明:无刈割处理的试验小区融雪斑块覆盖率显著高于其他处理;融雪斑块覆盖率与植物群落平均高度呈显著正相关(P＜0.01);融雪斑块可被分为单个融雪斑块和连通融雪斑块两种类型;单株高大植物覆盖面积与单个融雪斑块平均面积呈显著正相关(P＜0.01);当高大植物盖度达到14.5%时,可以完全防止积雪对冬季牧场造成的影响。

Abstract:

The drone was used to capture snowmelt images of alpine meadow with different mowing intensities and pika densities.The distribution characteristics of snowmelt patches were interpreted,and the area of each patch was obtained from the geographic information system.The effects of mowing and pika densities on the snow melting process were determined according to the snowmelt patch coverage.The relationship between the area of snowmelt patches and the average height of plant communities and the coverage of individual plants was studied.The results showed that the coverage of snowmelt patches in plots without moving was significantly higher than other treatments.The coverage of snowmelt patches had a significant positive correlation with the average height of plant communities (P＜0.01).Snowmelt patches were classified into single snowmelt patches and combined snowmelt patches.The coverage area of a single tall plant had a significant positive correlation with the average area of single snowmelt patches (P＜0.01).When the tall plant coverage reached 14.5%,the utilization of winter pasture was not affected by snow.