黄土丘陵区油松、沙棘生长旺盛期树干液流密度特征及其影响因素

doi:10.13287/j.1001-9332.201703.034

应用生态学报 ›› 2017, Vol. 28 ›› Issue (3): 763-771.doi: 10.13287/j.1001-9332.201703.034

黄土丘陵区油松、沙棘生长旺盛期树干液流密度特征及其影响因素

温杰¹, 陈云明^2,3*, 唐亚坤^2,3, 吴旭³, 谢育利³, 崔高阳³

¹西北农林科技大学林学院, 陕西杨凌 712100
²中国科学院教育部水土保持与生态环境研究中心, 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

收稿日期:2016-07-26 发布日期:2017-03-18
通讯作者: *E-mail: ymchen@ms.iswc.ac.cn
作者简介:温杰,男,1991年生,硕士研究生.主要从事流域生态和植物生理研究.E-mail:872917265@qq.com
基金资助:
本文由国家自然科学基金项目(41501576,41371506)、公益性行业(国家气象局)科研专项(重大专项) (GYHY2015060013)、中央高校基本科研业务费专项(Z109021606)和国家重点研发计划项目(2016YFC0501703)资助

Characteristics and affecting factors of sap flow density of Pinus tabuliformis and Hippophae rhamnoides in growing season in the hilly region of the Loess Plateau, China

WEN Jie¹, CHEN Yun-ming^2,3*,TANG Ya-kun^2,3,WU Xu³, XIE Yu-li³,CUI Gao-yang³

¹College of Fores-try, Northwest A&F University, Yangling 712100, Shaanxi, China
²Research Center of Institute of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling 712100, Shaanxi, China
³Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China

Received:2016-07-26 Published:2017-03-18
Contact: *E-mail: ymchen@ms.iswc.ac.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (41501576, 41371506), the China Special Fund for Meteorological Research in the Public Interest (Major Project) (GYHY2015060013), the Fundamental Research Funds for the Central Universities (Z109021606) and the National Key Research and Development Program of China (2016YFC0501703)

摘要/Abstract

摘要： 使用热扩散探针法(TDP)监测黄土丘陵区2015年7—9月人工林中油松和沙棘树干液流密度(J_s)的动态变化,并通过植物的水分利用生理特征判断2个树种的水分利用类型.结果表明: 油松和沙棘的J_s在降水前后均表现为单峰型日变化特征,油松生长旺盛期的J_s(12.62 mL·m^-2·s^-1)显著高于沙棘(2.60 mL·m^-2·s^-1).2个树种J_s与光合有效辐射、水蒸汽压差、土壤体积含水量(SWC)呈显著正相关.8月和9月降水前后,2个树种的J_s都主要受气象因素影响.9月降水导致SWC对沙棘J_s的解释量增加4.2%,而8月和9月的降水导致SWC对油松J_s的解释量均降低了0.3%.油松中午叶片水势显著高于沙棘且变异系数(7.3%)低于沙棘(11.7%),而沙棘具有较高的叶片气孔导度,因此可以判断出油松属于恒水型植物,沙棘属于变水型植物.

关键词: 沙棘, 恒水型, 液流密度, 变水型, 油松

Abstract: The dynamic changes of sap flow density (J_s) of Pinus tabuliformis and Hippophae rhamnoides in plantations from July to September in 2015 was monitored through thermal dissipation probe in the hilly region of the Loess Plateau. In addition, plant physiological characteristics were analyzed to determine the water use types of these two species. The results indicated that the daily changes of J_s of P. tabuliformis and H. rhamnoides showed a single peak during both pre- and post-precipitation. The J_s of P. tabuliformis in growing season (12.62 mL·m^-2·s^-1) was significantly higher than that of H. rhamnoides (2.60 mL·m^-2·s^-1). The J_s of these two species were significantly positively correlated with photosynthetic active radiation, vapor pressure deficit, soil volume-tric water content (SWC). The J_s of these two species were mainly influenced by meteorological factors during pre- and post-precipitation in both August and September. The contribution of SWC to J_s of H. rhamnoides increased by 4.2% after precipitation in September, but the contribution of SWC to J_s of P. tabuliformis decreased by 0.3% after precipitation in both August and September, respectively. Meanwhile, P. tabuliformis showed significantly higher water potential in midday leaf, but lower coefficient of variation (7.3%) than H. rhamnoides with the coefficient of variation of 11.7%. However, H. rhamnoides exhibited higher leaf stomatal conductance. Thus, P. tabuliformis and H. rhamnoides could be considered as isohydry and anisohydry species, respectively.

Key words: isohydry, Pinus tabuliformis, anisohydry, Hippophae rhamnoides., sap flow density

温杰, 陈云明, 唐亚坤, 吴旭, 谢育利, 崔高阳. 黄土丘陵区油松、沙棘生长旺盛期树干液流密度特征及其影响因素[J]. 应用生态学报, 2017, 28(3): 763-771.

WEN Jie, CHEN Yun-ming,TANG Ya-kun,WU Xu, XIE Yu-li,CUI Gao-yang. Characteristics and affecting factors of sap flow density of Pinus tabuliformis and Hippophae rhamnoides in growing season in the hilly region of the Loess Plateau, China[J]. Chinese Journal of Applied Ecology, 2017, 28(3): 763-771.

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黄土丘陵区油松、沙棘生长旺盛期树干液流密度特征及其影响因素

Characteristics and affecting factors of sap flow density of Pinus tabuliformis and Hippophae rhamnoides in growing season in the hilly region of the Loess Plateau, China

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