缙云山典型灌草植被区土壤水分对环境因子变化的响应

The Response of Jinyun Mountain Shrub-Grass Vegetation Zone Soil Moisture on Environmental Factors

2010年1—12月对重庆缙云山自然保护区内的典型灌草植被区的土壤水分及局地气象因子进行连续的定位观测,研究土壤水分月动态变化与环境因子的关系。结果表明:缙云山典型灌草植被区土壤水分月动态变化主要受气温和降水量的影响,不同深度的土壤水分变化趋势基本一致,但表层土壤水分要显著低于下层土壤。在降水较少的月份,土壤水分与空气相对湿度具有显著的正相关关系(P<0.05),与气温、太阳辐射和地表温度呈显著的负相关关系(P<0.05),与风速的关系不显著;土壤含水率与环境因子进行偏相关分析表明,土壤水分与气温因子的相关性达到极显著水平,偏相关系数为0.472(P<0.01);而与太阳辐射、相对湿度、地表温度、风速的响应程度依次减弱,偏相关系数分别为0.171、0.162、0.131、0.116(P>0.05)。

Based on observing at locations of shrub-grass vegetation zone in Jinyun Mountain from January to December,2010,the soil moisture monthly dynamic change and its relation to environmental factors were studied by the statistical analysis.The results showed that:dynamic monthly changes in Jinyun typical shrub and grass vegetation zones at different levels of soil moisture was mainly affected by the temperature and water,and the soil moisture changing trend at three levels was basically the same,but the surface soil moisture content was significantly lower than the subsoil.The soil moisture and relative humidity had significant positive correlation( P < 0.05),and showed a significant negative correlation( P < 0.05) with the air temperature,solar radiation and surface temperature,the wind speed was not significant.Partial correlation analysis of soil moisture and other environmental factors indicated that the response of soil moisture and temperature factors achieved a very significant level and the partial correlation coefficient was 0.472( P <0.01),but the response relationship degree with sun radiation,relative humidity,surface temperature and wind speed were weakened followed and the partial correlation coefficients were 0.171,0.162,0.131 and 0.116 respectively( P > 0.05).