摘要
采用定位观测与综合分析相结合、野外实验与模型模拟相结合的方法,利用LI 6400光合仪研究米仓山国家森林公园巴山水青冈原生林地及皆伐13年后林地土壤呼吸特征。结果表明,原生林及皆伐迹地土壤呼吸作用季节变化和日变化均呈单峰曲线。生长季节中,土壤呼吸作用最强的季节是7-8月,最弱季节是4月和11月;昼夜变化中最强呼吸出现在14:00-15:00,凌晨5:00左右土壤呼吸作用最弱。土壤呼吸速率与5 cm深度土壤温度存在显著线性关系,与近地面地表温度存在极显著指数关系。皆伐迹地经过自然恢复后土壤呼吸作用比原生林强。
The soil respiration rate of Fagus pashanica primary forest and the clear-cut field after 13 years natural recovery were measured with a LI 6400 portable photosynthesis system in Micangshan national forest park. The results showed that the seasonal variations of soil respiration could be expressed as single peak curve in the primary forest and clear-cut field. The maximum value of seasonal variations appeared in July and August during the growing season, the minimum value appeared in April and November. The results indicated that the diurnal variations of soil respiration could also be expressed as single peak curve with the maximum value appeared in 14：00--15：00 and the minimum value appeared around 5：00. There was a significant linear relationship between soil respiration rate and soil temperature at the depth of 5 cm, and a significant exponential relationship between soil respiration rate and soil temperature at surface. The soil respiration of the primary forest was weaker than one of the clear-cut field after 13 years natural recovery.
出处
《水土保持学报》
CSCD
北大核心
2009年第2期244-248,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金资助项目(30670209)
四川省林业厅科技先导项目(06-03)
关键词
巴山水青冈林
皆伐迹地
土壤呼吸作用
温度
Fagus pashanica forest
clear-cut field
soil respiration
temperature
