降雨减少对刺槐树干液流特征的影响

doi:10.13292/j.1000-4890.202401.020

生态学杂志 ›› 2024, Vol. 43 ›› Issue (1): 122-130.doi: 10.13292/j.1000-4890.202401.020

降雨减少对刺槐树干液流特征的影响

郭海宁^1,2,刘美君^1,2,杜盛^2,3,*

(¹西北农林科技大学林学院，陕西杨凌 712100； ²西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室，陕西杨凌 712100； ³中国科学院水利部水土保持研究所，陕西杨凌 712100)

出版日期:2024-01-10 发布日期:2024-01-09

Effects of rainfall reduction on stem sap flow of Robinia pseudoacacia.

GUO Haining^1,2, LIU Meijun^1,2, DU Sheng^2,3*

(¹College of Forestry, Northwest A&F University, Yangling 712100, Shaanxi, China; ²State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, Shaanxi, China; ³Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China).

Online:2024-01-10 Published:2024-01-09

摘要/Abstract

摘要： 在全球气候变化背景下，区域降水格局正在发生改变，对森林生态系统生产力和水文过程将产生重要影响。为揭示降雨量减少对树木蒸腾耗水特征及其响应环境因子的影响，本研究以黄土高原半湿润区主要造林树种刺槐（Robinia pseudoacacia）为对象，在减雨样地林分行间布设人工减雨板减少约47%的降雨输入，采用Granier型热扩散探针测定树干液流动态，并同步监测太阳辐射、空气温度、相对湿度、降雨事件和土壤含水量等环境因子，分析了树干液流对减雨处理及季节性土壤水分变化的响应特征。结果表明：减雨处理显著降低了刺槐液流通量密度标准化值，处理第3年标准化液流通量密度显著低于对照样地；减雨样地刺槐标准化液流日变化峰值时间早于对照样地，表明减雨样地刺槐较早实施了气孔调节，改变了其与气象因子的时滞时间；标准化液流通量密度响应蒸腾驱动因子的拟合方程参数值在样地间呈极显著差异，显示减雨样地刺槐响应气象因子的敏感性有所降低。降雨量的改变不仅影响林地土壤水分状况，还会对刺槐蒸腾耗水及其对环境因子的响应产生影响。

关键词: 刺槐, 土壤水分, 树干液流, 蒸腾

Abstract: Under the background of global climate change, regional precipitation pattern is changing, with consequences on forest ecosystem productivity and hydrological processes. To investigate the effects of rainfall reduction on the characteristics of transpiration water use and their responses to environmental factors in trees, we applied rainfall reduction treatment to a plantation of black locust (Robinia pseudoacacia), a major afforestation species, in a sub-humid region of Loess Plateau. Transparent waterproof panels were laid out in the inter-rows of the rainfall reduction plot to reduce the rainfall input by 47%. Stem sap flow was measured by Granier’s thermal dissipation probes. Environmental factors including solar radiation, air temperature, relative humidity, rainfall events and soil moisture were monitored simultaneously. The response characteristics of stem sap flow to rainfall reduction and seasonal soil moisture changes were analyzed. The results showed that rain reduction significantly reduced the norma-lized sap flux density of black locust trees. After three years of treatment, normalized sap flux density in the rain reduction treatment was significantly lower than that in the control. The diurnal peak time of the normalized sap flux density in the rain reduction plots was earlier than that in the control, indicating that stomatal adjustment occurred earlier and that the time lag between sap flow and meteorological factors was changed. The fitting equation parameters of normalized sap flux density response to transpiration driving factors were significantly different between both treatments, indicating that the sensitivity of black locust response to meteorological factors in the treatment of rain reduction was weakened. These results suggest that precipitation changes not only affect forest soil water availability, but also affect the transpiration characteristics of black locust trees and their responses to environmental factors.

Key words: Robinia pseudoacacia, soil moisture, stem sap flow, transpiration

郭海宁, 刘美君, 杜盛. 降雨减少对刺槐树干液流特征的影响[J]. 生态学杂志, 2024, 43(1): 122-130.

GUO Haining, LIU Meijun, DU Sheng. Effects of rainfall reduction on stem sap flow of Robinia pseudoacacia.[J]. Chinese Journal of Ecology, 2024, 43(1): 122-130.

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降雨减少对刺槐树干液流特征的影响

Effects of rainfall reduction on stem sap flow of Robinia pseudoacacia.

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