海北高寒草甸返青期土壤温度与水分动态变化

发布时间：2018-04-13 01:03

  本文选题：高寒草甸 + 返青期　； 参考：《生态环境学报》2017年03期

【摘要】：分析青藏高原高寒草甸返青期土壤水分和温度的变化以及相互关系是理解高寒草甸生态系统变化的重要基础。为明晰青藏高原祁连山东部高寒草甸返青期的土壤温度与水分变化规律,选择祁连山东部海北高寒草甸为试验区,以实地测试与方差、相关及回归分析相结合的方法研究了海北高寒草甸返青期土壤分层水分和温度的动态变化。结果表明:(1)观测期内,高寒草甸整个返青期表层0 cm及地表以下5、15、30、60和120 cm土壤各层平均温度分别为10.47、4.11、3.28、1.76、0.80和0.51℃,表层0 cm地温受气温变化影响最为显著;返青早期各层土壤温度均稳定于0℃左右,返青中期各层土壤温度迅速增加,返青中后期自上而下不同土壤层温度逐渐降低;(2)表层、中层和深层土壤平均含水量分别为17.3%、20.6%和20.9%,中层和深层土壤水分含量较小;表层土壤含水量波动剧烈,在整个返青期呈逐渐下降趋势,中层和深层土壤含水量连续增加,波动范围小;(3)高寒草甸土层0~15 cm的土壤体积含水量与土壤温度呈显著负相关,随土壤平均温度增加,土壤体积含水量逐渐降低;15~30、30~45和45~60 cm较深层土壤含水量与土壤平均温度呈显著正相关,随土壤深度增加其相关性也随之增强。该研究可为理解青藏高原高寒草甸生态系统的变化规律和变化过程提供参考依据,对高寒草甸的保护及可持续利用也具有重要意义。
[Abstract]:It is important to analyze the changes of soil moisture and temperature and their relationship between alpine meadow and alpine meadow ecosystem in Qinghai-Xizang Plateau.In order to understand the variation of soil temperature and water in the alpine meadow in the eastern Qilian Mountains of Qinghai-Xizang Plateau, the alpine meadow in the east of Qilian Mountains was selected as the experimental area, and the field test and variance were used.Correlation and regression analysis were used to study the dynamic changes of soil stratified water and temperature in the green stage of alpine meadow in Haibei.The results showed that during the observation period, the average temperature of 0 cm surface layer and 5151530 ~ (60) and 120 cm soil layer of Alpine meadow was 10.47 ~ 4.11 ~ 3.281.76 ~ 0.80 鈩，

本文编号：1742214