多年冻土区白桦次生林蒸腾特征及其对影响因子的响应

尚友贤; 满秀玲; 徐志鹏

doi:10.13870/j.cnki.stbcxb.2023.02.036

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多年冻土区白桦次生林蒸腾特征及其对影响因子的响应

更新时间：2025-03-12

- 多年冻土区白桦次生林蒸腾特征及其对影响因子的响应
- Transpiration Characteristics and Its Response to Influence Factors of
- 水土保持学报 2023年37卷第2期页码：310-319
- 作者机构：
  
  东北林业大学林学院,哈尔滨,150040
- 作者简介：
  
  [ "尚友贤(1996—),男,硕士研究生,主要从事水土保持研究。E-mail:shangyouxian2022@163.com" ]
- 基金信息：
  
  国家重点研发项目(2021YFD2200405)
- DOI：10.13870/j.cnki.stbcxb.2023.02.036
  中图分类号： S718.55
- 纸质出版：2023
- 稿件说明：
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尚友贤, 满秀玲, 徐志鹏. 多年冻土区白桦次生林蒸腾特征及其对影响因子的响应[J]. 水土保持学报, 2023,37(2):310-319.

SHANG Youxian, MAN Xiuling, XU Zhipeng. Transpiration Characteristics and Its Response to Influence Factors of[J]. 2023, 37(2): 310-319.
尚友贤, 满秀玲, 徐志鹏. 多年冻土区白桦次生林蒸腾特征及其对影响因子的响应[J]. 水土保持学报, 2023,37(2):310-319. DOI： 10.13870/j.cnki.stbcxb.2023.02.036.

SHANG Youxian, MAN Xiuling, XU Zhipeng. Transpiration Characteristics and Its Response to Influence Factors of[J]. 2023, 37(2): 310-319. DOI： 10.13870/j.cnki.stbcxb.2023.02.036.

摘要

探究多年冻土区白桦次生林蒸腾特征对影响因子的响应

为准确评估该地区森林生态系统水文效应提供科学参考。运用热扩散式探针法

从2021年5—9月对多年冻土区的白桦树干液流进行监测

并同步观测影响因子变化情况。结果表明:整个观测期

白桦次生林蒸腾表现出明显的小时、日、月变化。(1)白桦次生林小时蒸腾特征表现为优势木＞中等木＞被压木

蒸腾动态在晴天呈单峰曲线

在雨天呈双峰曲线。日尺度上

白桦次生林蒸腾平均值为1.47 mm/d

且最大值出现在7月。在整个观测期

林分蒸腾表现出明显的月变化

即7月＞6月＞8月＞9月＞5月

分别为65.08

62.43

54.27

22.92

19.84 mm;(2)林分累计蒸腾量共计224.54 mm

占同期降雨量的32.41%

其中优势木为林分蒸腾的主要贡献者

占林分总蒸腾量的62.64%;(3)在小时尺度上

林分蒸腾量主要受大气温度和饱和水汽压差所影响;日尺度上

林分蒸腾与潜在蒸散、空气温度、太阳辐射、饱和水汽压差、叶面积指数以及土壤温度极显著正相关(p＜0.01);与空气相对湿度极显著负相关(p＜0.01);与土壤含水量关系不显著(p＞0.05)

潜在蒸散、叶面积指数、饱和水汽压差以及空气温度是驱动林分日蒸腾的主要影响因子;月尺度上

空气温度对林分蒸腾的影响最大

其对林分蒸腾的解释度高达93.90%。

Abstract

To investigate the response of transpiration characteristics of Betula platyphylla secondary forest to influencing factors in permafrost area

and to provide scientific reference for accurate assessment of the hydrological effects of forest ecosystems in this region.The sap flow of Betula platyphylla was measured using thermal dissipation probes from May to September 2021 in permafrost area

and the influence factors were observed simultaneously.The results showed that the stand transpiration of Betula platyphylla secondary forest showed obvious hourly

daily and monthly changes during the study period.(1) The hourly transpiration characteristics of Betula platyphylla secondary forest was exhibited that dominant trees > intermediate trees > suppressed trees.Furthermore

diurnal variations of daily transpiration performed a single peak curve pattern in sunny days

while the bimodal curve was observed in rainy days.Meanwhile

the daily mean stand transpiration of Betula platyphylla secondary forest was 1.47 mm/d

with the maximum value appeared in July.A significant monthly variation of transpiration was found during the whole observation period and ranked as follows:July > June > August > September > May

which was 65.08

62.43

54.27

22.92 and 19.84 mm

respectively.(2) The cumulative transpiration of the stand was 224.54 mm

accounting for 32.41% of the total precipitation over the same period

and the transpiration of the dominant trees was the main contributors to the stand transpiration

accounting for 62.64% of the stand transpiration.(3) At the hourly scale

transpiration was mainly affected by air temperature and vapor pressure deficit.At the daily scale

transpiration was positively correlation with potential evapotranspiration

air temperature

solar radiation

vapor pressure deficit

leaf area index and soil temperature (p<0.01)

which was significant negative correlation with air relative humidity (p<0.01) and no significant correlation with soil water content (p>0.05)

and potential evapotranspiration

leaf area index

vapor pressure deficit and air temperature were the main factors driving the daily stand transpiration.At the monthly scale

air temperature had the greatest impact on stand transpiration

which explained 93.90% of stand transpiration.

关键词

Keywords

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