拉萨灌丛草甸区土壤温度变化特征
发布时间：2018-11-12 07:50
【摘要】：土壤温度影响土壤发育与植被状况,是反映脆弱生态系统环境状况的基本参数。本文通过一年的实地观测,分析了拉萨典型灌丛草甸区土壤温度特征及其在海拔梯度与深度层次上的变化规律。结果表明:(1)0~30 cm深度范围,年内土壤日均温变化类似余弦曲线,平均值为2.94℃,年内有147 d土壤低于0℃;一天内土壤温度变化类似正弦曲线,日温差平均为2.80℃,夏季温差大,秋季温差小。(2)土壤年均温与海拔符合线性关系,土壤年均温随海拔的变率为-0.63℃(100 m-1),夏季土壤温度的海拔效应较其他季节明显;且海拔越高,土壤温度波动幅度越大。(3)土壤年均温与深度呈幂函数关系;随深度的增加,土壤温度变率降低。20 cm是土壤温度变化相对稳定的浅土层。
[Abstract]:Soil temperature, which affects soil development and vegetation status, is the basic parameter to reflect the environmental condition of fragile ecosystem. Based on one year's field observation, the characteristics of soil temperature in typical shrub meadow area in Lhasa and its variation law at the level of elevation gradient and depth are analyzed. The results showed that: (1) in the depth range of 0 ~ 30 cm, the variation of soil daily average temperature in the year was similar to that of cosine curve, the average value was 2.94 鈩，
本文编号：2326516
[Abstract]:Soil temperature, which affects soil development and vegetation status, is the basic parameter to reflect the environmental condition of fragile ecosystem. Based on one year's field observation, the characteristics of soil temperature in typical shrub meadow area in Lhasa and its variation law at the level of elevation gradient and depth are analyzed. The results showed that: (1) in the depth range of 0 ~ 30 cm, the variation of soil daily average temperature in the year was similar to that of cosine curve, the average value was 2.94 鈩，
本文编号：2326516
本文链接：https://www.wllwen.com/kejilunwen/nykj/2326516.html
