摘要
为了筛选出洞穴滴水中可以反映石漠化程度的指标,对朝营小流域处于石漠化条件下2个洞穴的滴水进行了为期1a的动态监测,分析滴水的物理性质和化学成分。结果表明:所选洞穴的滴水水温变化较一致,并受当月的大气平均温度影响显著;滴水滴率与降雨量有关,且受植被-土被覆盖度以及基岩厚度的共同制约;石灰岩地区的洞穴,石漠化程度低的地区滴水pH值偏小,强度石漠化地区滴水pH值可能存在'雨季高,旱季低'的规律,与潜在石漠化地区及非喀斯特地区洞穴滴水的季节变化规律相反;滴水的电导率与Ca2+含量呈正相关,受大气温度、降雨量、土壤生物源CO2的影响大,石漠化程度较低的地区,滴水电导率和Ca2+浓度大于石漠化程度高的地区。
To screen out the indicators which is able to reflect the degree of rocky desertification in cave drip water,the cave drip water karst desertification area was monitored for 1 year in Chaoying small watershed,which physical properties and chemical compositions of drip water were analyzed. The result shows that the temperature variations of drip water in selected caves are consistent and effected by the average monthly atmospheric temperature significantly. Drip rates are related to rainfall and restricted by vegetation,soil coverage and bedrock thickness. For limestone cave of rocky desertification area,pH values of drip water in lower level are smaller,it conforms to the rule as "higher in rainy season and lower in dry season " in severe rocky desertification. Drip water EC in rocky desertification area is positively correlated with Ca2+ content; they are affected by atmospheric temperature,rainfall and CO2 of soil biological source greatly. EC and Ca2+ concentration of drip water in lower level rocky desertification area are relatively larger than those of higher level area.
出处
《科技通报》
2018年第6期39-45,共7页
Bulletin of Science and Technology
基金
国家自然科学基金项目(41761104)
贵州师范大学2017年博士科研启动项目
关键词
石漠化
洞穴滴水
影响因素
朝营小流域
karst desertification
cave drip water
influence factor
Chaoying small watershed
