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茂兰喀斯特森林小果润楠蒸腾特征及影响因素(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2019年03期
Page:
51-58
Column:
研究论文
publishdate:
2019-05-15

Article Info:/Info

Title:
Transpiration characteristics and influencing factors of the dominant species of Machilus microcarpa in Maolan Karst forest
Article ID:
1000-2006(2019)03-0051-08
Author(s):
LI Chenglong1 LIU Yanhui2 DING Fangjun2* SHU Deyuan2 CUI Yingchun2 ZHAO Wenjun2 HOU Yiju2 WU Peng2
1. College of Life Sciences, Guizhou University, Guiyang 550025, China; 2. Guizhou Academy of Forestry, Guiyang 550005, China
Keywords:
Machilus microcarpa transpiration characteristics environmental factor Karst forest
Classification number :
S718.5
DOI:
10.3969/j.issn.1000-2006.201808018
Document Code:
A
Abstract:
【Objective】The transpiration characteristics and influencing factors of the dominant tree species Machilus microcarpa in the Maolan Karst forest were determined. This provided scientific basis for further analysis of the hydro-ecological process of the Maolan primary forest and the Karst area of forest protection and ecological restoration. 【Method】 Utilizing the thermal dissipation probe method and a Campbell automatic weather station, the transpiration of the dominant tree species M. microcarpa was continuously monitored from July 2016 to June 2017 in the Maolan Karst forest, and the photosynthetic and transpiration rates of the leaves measured. 【Result】 The diurnal variation of M. microcarpa transpiration rate showed a typical single-peak curve under all types of weather conditions, and displayed a clear fluctuating trend with high transpiration in the daytime and low transpiration at nighttime. Under sunny weather conditions, the diurnal variation trend of the horizontal transpiration rate of a single tree was consistent with that of the photosynthesis rate and transpiration rate at the leaf level. Under different weather conditions, the transpiration rate showed highly significant differences, with the following averages: 122.00 g/h on sunny days, 76.06 g/h on cloudy days, and 19.60 g/h on rainy days. The daily average transpiration rates on sunny days were 1.60, 6.22 times higher than that on cloudy days, rainy days, respectively. The daily average transpiration rates on cloudy days was 3.88 times higher than that on rainy day. The average annual transpiration rate of individual trees in each season went from high to low in summer [(1.86 ± 0.22)kg/d], autumn [(1.71 ± 0.38)kg/d], spring [(1.59 ± 0.13)kg/d] and winter [(1.07 ± 0.39)kg/d]. The individual plant transpiration rate was 570.31 kg, with 82.81% during the growing season(472.29 kg)and 17.19% during the non-growing season(98.02 kg). The highest transpiration rate was in summer(171.65 kg), followed by autumn(155.60 kg), spring(145.04 kg)and winter(98.02 kg), which accounted for 30.10%, 27.28%, 25.43% and 17.19% of the annual evapotranspiration, respectively. Solar radiation and water vapor pressure were positively correlated with the transpiration rate. 【Conclusion】 Solar radiation and water vapor pressure loss were the dominant factors of the transpiration of M. microcarpa, and rainfall was the inhibition factor, whereas wind speed and soil moisture at different depths had different effects on transpiration under different weather and seasons.

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Last Update: 2019-05-15