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Influence of stand structure of Pinus massoniana on canopy hydrological effect.

YUAN Xiu-jin1,2, XIAO Wen-fa1,2, LEI Jing-pin3, WANG Xiao-rong1,4, HU Wen-jie4, CUI Hong-xia4, PANG Hong-dong4, PAN Lei4*   

  1. (1State Forestry Administration Key Laboratory of Forest Ecology and Environment, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China; 2Collaborative Innovation Center of Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China; 3Key Laboratory of Forest Silviculture of the State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China; 4Hubei Academy of Forestry, Wuhan 430075, China).
  • Online:2020-02-10 Published:2020-02-10

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Abstract: Understanding the hydrological effects of forest across different stand structures and the main influencing factors can provide scientific support for forest management. We set up 14 plots with each area of 20 m×30 m in Pinus massonianaforests in the Jiulingtou Forest Farm located in Three Gorges Reservoir Area of China. We measured canopy interception, stemflow and throughfall, and assessed their stand characteristics. Pearson’s correlation analysis, principal component analysis and redundancy analysis were used to analyze the effects of stand structure (leaf areaindex, basal area, crown area, tree height, canopy density, stand density, mixing degree, size ratio, and competition index) on canopy interception rate, throughfall rate, stemflow rate. During the study period (June-October), the total amount of rainfall was 1008.4 mm, with interception, throughfall and stemflow accounting for 16.3%, 82.3% and 1.4% of the rainfall, respectively. Leaf area index, basal area and crown area were positively correlated with canopy interception rate (P<0.05), and negatively with throughfall rate (P<0.05). There were significant negative correlations between stemflow rate and tree height and canopy density (P<0.05), and a significant positive correlation between leaf area index and stand density (P<0.05). The results of the redundancy analysis showed that the combination of structural variables explained 59.6% of the redistribution of hydrological effect. Results of the Monte Carlo displacement test showed that canopy interception rate and throughfall rate were mainly affected by the combination of structural variables, such as forest stock volume. Higher the canopy interception rate and lower throughfall were correlated with larger forest stock volume. The stemflow rate was mainly affected by competition status and horizontal structure (R2=0.46, P<0.05) and forest stock volume (R2=0.51,P<0.05). The canopy hydrological effect was closely related to stand structure. Forest stock volume and water conservation effects were higher when the stand grew better.

Key words: degradation characteristics, napropamide, Bacillus cereus, degradation pathway., strain LGY06