降雨强度对不同海拔侧柏叶片滞纳大气颗粒物量的影响  

Influence of rainfall intensity on the amount of atmospheric particles retained by the leaves of Platycladus orientalis at different altitudes

作　　者：刘维欢 李晓刚 裴顺祥[1] LIU Weihuan;LI Xiaogang;PEI Shunxiang(Experimental Centre of Forestry in North China,Chinese Academy of Forestry,Beijing Jiulong Mountain National Long-term Scientific Research Base of Warm Temperate Forests,Beijing 102300,China;College of Forestry,Hebei Agricultural University,Baoding 071000,China)

机构地区：[1]中国林业科学研究院华北林业实验中心,北京九龙山暖温带森林国家长期科研基地,北京102300 [2]河北农业大学林学院,保定071001

出　　处：《生态科学》2024年第2期102-109,共8页Ecological Science

基　　金：中央级公益性科研院所基本科研业务费专项资金(CAFYBB2017QA023,CAFYBB2019ZC006)。

摘　　要：降雨可以有效清除植物叶片滞纳的大气颗粒物,但降雨强度对不同海拔植物叶面滞尘量的影响研究较缺乏。以九龙山不同海拔侧柏人工林为研究对象,采用传统方法测定不同强度降雨前后植物叶片滞纳大气颗粒物的量,进而研究降水强度对不同海拔侧柏叶片滞纳水溶/非水溶性颗粒物的影响。研究结果表明,中雨(17.5 mm)对不同海拔侧柏叶片滞纳颗粒物的去除效果强于小雨(3.2 mm);中雨后,侧柏叶片滞纳颗粒物的阈值为(0.4248±0.0104)g·m^(-2),且与海拔、降雨前叶面滞纳颗粒物的量无关;小雨后,不同海拔侧柏叶面非水溶性颗粒物存在明显的小粒径聚集为大粒径现象;在低、中海拔地区,中雨主要影响侧柏叶面大粒径颗粒物的量,而高海拔地区主要影响小粒径颗粒物的量;降雨对非水溶性大粒径颗粒物的影响大于水溶性颗粒物;小雨会增加不同海拔侧柏叶片大粒径水溶/非水溶性颗粒物的百分比,中雨会使低、高海拔侧柏叶片大粒径水溶性颗粒物和高海拔大粒径非水溶性颗粒物的百分比增加,而其他海拔侧柏叶片大粒径水溶/非水溶性颗粒物的百分比下降。Rainfall can effectively remove the atmospheric particulate matter that plants leaves behind,but the impact of rainfall intensity on the amount of dust retention on plant leaves at different altitudes is lacking.Based on this,in this study,planted Platycladus orientalis forests at different altitudes in Jiulong Mountain were regarded as the research object,traditional methods were used to determine the amount of atmospheric particulates retained by plant leaves before and after rains of different intensities;furthermore,the influence of precipitation intensity on the retention of water-soluble/insoluble particulate matter in P.orientalis leaves at different altitudes was analyzed.The results showed that,the effect of moderate rain(17.5 mm)on the removal of retained particles in the leaves of P.orientalis at different altitudes was stronger than that of light rain(3.2 mm).After moderate rain,the threshold of the retention of particulate matter by the leaves of P.orientalis was(0.4248±0.0104)g·m^(–2),and it had nothing to do with the altitude and the amount of retention of particulate matter on the leaf surface before the rainfall.After light rain,the non-water-soluble particles on the leaf surface of P.orientalis at different altitudes had obvious small particle size aggregation into large particle size phenomenon.In low and medium altitude areas,moderate rain mainly affected the amount of large-sized particles on the leaf surface of P.orientalis,while high-altitude areas mainly affected the amount of small-sized particles.The impact of rainfall on non-water-soluble large-size particles was greater than that of water-soluble particles.Light rain increased the percentage of large-sized water-soluble/insoluble particles in the leaves of P.orientalis at different altitudes,and moderate rain increased the percentage of large-sized water-soluble particles in the leaves of P.orientalis at low and high altitudes and the percentages of large-sized insoluble particles at high altitudes,while the percentage of large-siz

关 键 词：侧柏 海拔 粒径 水溶性颗粒物 非水溶性颗粒物 

分 类 号：X51[环境科学与工程—环境工程]