树干液流对蒸腾驱动因子响应的土壤水分限制与非限制特征

doi:10.13287/j.1001-9332.202404.024

应用生态学报 ›› 2024, Vol. 35 ›› Issue (4): 1064-1072.doi: 10.13287/j.1001-9332.202404.024

树干液流对蒸腾驱动因子响应的土壤水分限制与非限制特征

常乐^1,2, 刘美君^1,2, 吕金林^3,4, 杜盛^1,3*

¹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;
²西北农林科技大学林学院, 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;
⁴陕西省西安植物园, 西安 710061

收稿日期:2023-10-27 接受日期:2024-02-23 出版日期:2024-04-18 发布日期:2024-10-18
通讯作者: * E-mail: shengdu@ms.iswc.ac.cn
作者简介:常乐, 男, 1999年生, 硕士研究生。主要从事森林蒸腾耗水研究。E-mail: changle6527@163.com
基金资助:
国家重点研发计划项目(2017YFC0504601)

Characteristics of soil moisture limitation and non-limitation in the response of sap flow to transpiration driving factors

CHANG Le^1,2, LIU Meijun^1,2, LYU Jinlin^3,4, DU Sheng^1,3*

¹State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, Shaanxi, China;
²College of Forestry, 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;
⁴Xi'an Botanical Garden of Shaanxi Province, Xi'an 710061, China

Received:2023-10-27 Accepted:2024-02-23 Online:2024-04-18 Published:2024-10-18

摘要/Abstract

摘要： 蒸腾耗水是森林生态系统水循环的重要组成部分,这一过程由气象因子驱动并可能受到土壤水分条件的限制。本研究采用Granier热扩散探针法,对半干旱黄土丘陵区辽东栎、侧柏和刺槐的树干液流动态进行监测,结合同期连续监测的主要气象要素和土壤体积含水量(SWC),分析并确定以土壤水分阈值区分树干液流对蒸腾驱动因子响应的限制与非限制模式。结果表明: 辽东栎和刺槐的平均液流通量密度(J_s)在土壤含水量较高时期显著高于土壤含水量较低时期,侧柏J_s在两个时期的差异不显著。使用指数饱和函数对各树种的J_s与反映太阳辐射和空气水汽压亏缺的整合蒸腾变量(VT)进行拟合,拟合曲线参数的差异表明,在不同土壤水分条件下J_s与VT之间存在不同的响应模式。土壤水分对各样树树干液流的限制作用存在阈值效应,辽东栎、侧柏和刺槐的SWC阈值分别为0.129、0.116和0.108 m³·m^-3;在SWC低于其阈值时,各树种J_s受土壤水分限制,在高于阈值后辽东栎和侧柏的归一化敏感指数(NSI)值达到饱和,而刺槐的NSI值仍未达到饱和,但受土壤水分的限制明显降低。3个树种中,侧柏最容易摆脱土壤水分限制。

关键词: 黄土丘陵区, 树干液流, 土壤含水量, 阈值

Abstract: Transpiration is a significant part of water cycle in forest ecosystems, influenced by meteorological factors and potentially constrained by soil moisture. We used Granier-type thermal dissipation probes to monitor xylem sap flow dynamics of three tree species (Quercus liaotungensis, Platycladus orientalis, and Robinia pseudoacacia) in a semi-arid loess hilly region, and to continuously monitor the key meteorological factors and soil water content (SWC). We established the SWC thresholds delineating soil moisture-limited and -unlimited sap flow responses to transpiration drivers. The results showed that mean sap flux density (J_s) of Q. liaotungensis and R. pseudoacacia was significantly higher during period with higher soil moisture compared to lower soil moisture, while the difference in J_s for P. orientalis between the two periods was not significant. We used an exponential saturation function to fit the relationship between the J_s of each tree species and the integrated transpiration variable (VT) which reflected solar radiation and vapor pressure deficit. The difference in the fitting curve parameters indicated that there were distinct response patterns between J_s and VT under different soil moisture conditions. There was a threshold in soil moisture limitation on sap flow for each species, which was identified as 0.129 m³·m^-3 for Q. liaotungensis, 0.116 m³·m^-3 for P. orientalis, and 0.108 m³·m^-3 for R. pseudoacacia. Below the thresholds, J_s was limited by soil moisture. Above these points, the normalized sensitivity index (NSI) for Q. liaotungensis and P. orientalis reached saturation, while that of R. pseudoacacia did not reach saturation but exhibited a significant reduction in moisture limitation. Among the three species, P. orientalis was the most capable of overcoming soil moisture constraints.

Key words: loess hilly region, sap flow, soil moisture, threshold

常乐, 刘美君, 吕金林, 杜盛. 树干液流对蒸腾驱动因子响应的土壤水分限制与非限制特征[J]. 应用生态学报, 2024, 35(4): 1064-1072.

CHANG Le, LIU Meijun, LYU Jinlin, DU Sheng. Characteristics of soil moisture limitation and non-limitation in the response of sap flow to transpiration driving factors[J]. Chinese Journal of Applied Ecology, 2024, 35(4): 1064-1072.

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树干液流对蒸腾驱动因子响应的土壤水分限制与非限制特征

Characteristics of soil moisture limitation and non-limitation in the response of sap flow to transpiration driving factors

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