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Scientia Silvae Sinicae ›› 2020, Vol. 56 ›› Issue (8): 181-190.doi: 10.11707/j.1001-7488.20200820

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Changes of Particulate Matter Retention Characteristics and the Response of Physiological Characteristics of Poplar Leaves Under the Influence of Rainfall and Irrigation

Xu Ma1,Zhiguo Cao2,Chen Yue1,Chuhan Jin1,Jun Liu3,Yang Liu1,Guifang Xiu4,Benye Xi1,*   

  1. 1. Ministry of Education Key Laboratory of Silviculture and Conservation, Beijing Forestry University Beijing 100083
    2. Ministry of Education Key Laboratory for Yellow River and Huaihe River Water Environmental and Pollution Control, School of Environment, Henan Normal University Xinxiang 453007
    3. East China Inventory and Planing Institute, State Forestry and Grasland Administration Hangzhou 310019
    4. Liaocheng Natural Resources and Planning Bureau Grange Nursery Liaocheng 252000
  • Received:2020-01-16 Online:2020-08-25 Published:2020-09-15
  • Contact: Benye Xi

Abstract:

Objective: This study aims to explore the effects of rainfall and irrigation on the particulate matter on leaves that grow in the lowest part of the canopy of poplar,and analyze whether the rainfall affects the physiological traits of leaves to provide a basis for the research and development of urban forest air pollution mitigation capacity improvement technology and the in-depth understanding of the interaction between tree physiological activities and atmospheric particulate pollution. Methods: Full drip irrigation(DIFI) treatment with the control(CK) were conducted in the experiment,and in each treatment,5 trees were selected as the sample trees. Two branches were selected from the lowest part of the canopy of each tree for two experimental treatments:(i)rainfall exclusion; (ii) no rainfall exclusion. Leaves on the two branches were used to measure. Results: 1) The retention quality of all types and diameter PM in DIFI treatment was slightly higher than that in CK treatment(except for water-soluble PM2.5-10),but there was no significant difference(P>0.05). 2) The long-term cumulative retention quality of PM of each type and diameter size on the leaves per unit area under no rainfall exclusion treatment was slightly lower than that of the leaves under rainfall exclusion treatment,but there was no significant difference (P>0.05). 3) The quality of the wax layer on the leaves and the PM in the wax layer significantly decrease at the end of the experiment(P < 0.01),but there was no significant difference between the two treatments(P>0.05). 4) At the middle and the final stage of the experiment,the stomatal conductance of the leaves under no rainfall exclusion was significantly lower than that of the leaves under rainfall exclusion(P < 0.05). And at the final stage of the experiment,the midday leaf water potential of the leaves under no rainfall exclusion was significantly lower than that of the leaves under rainfall exclusion(P=0.032).After rainfall(no rainfall exclusion),although the net photosynthetic rate(Pn),transpiration rate(Tr),and water use efficiency(WUE) of the leaves did notchange significantly(P>0.05),Pn and WUE had a decrease trend,while Trdid notalways show the trend. Conclusions: At the leaf level,irrigation has a small effect on the retention of the particulate matter on leaves of Populus tomentosa,and rainfall can wash away larger diameter particulate matter on leaves to a certain extent. The increase of foliar particulate matter can significantly improve the stomatal conductance of P. stomentosa, thus affect its gas exchange rate.

Key words: atmospheric particulate matter, water-soluble particulate matter, Populus tomentosa, irrigation, rainfall

CLC Number: