| 黄土丘陵区辽东栎和刺槐树干液流时滞效应 与蒸腾特征的关联性 | |
| 杨洁1,2; 吕金林2,3; 何秋月1,2; 闫美杰2,3; 李国庆2,3; 杜盛2,3 | |
| 2019 | |
| 发表期刊 | 应 用 生 态 学 报
 |
| 卷号 | 30期号:8页码:2607-2613 |
| 摘要 | 运用 Granier 热扩散探针法，于 2016 年 7—9 月对半干旱黄土丘陵区天然次生林树种
辽东栎和人工林树种刺槐的树干液流进行连续测定，并同步监测气象因子和土壤含水量，用
错位相关法分析液流通量密度与空气水汽压亏缺日变化的时滞长度，研究 2 个树种不同径级
个体在不同土壤水分条件下液流通量密度与蒸腾驱动因子之间的时滞效应．结果表明: 辽东
栎和刺槐液流通量密度的日变化节律与气象因子显著相关，空气水汽压亏缺峰值的出现较辽
东栎树干液流通量密度滞后 118．2 min，较刺槐树干液流通量密度滞后 39．5 min; 而光合有效
辐射的峰值通常滞后于辽东栎 12．4 min，提前于刺槐 68．5 min．液流通量密度和空气水汽压亏
缺的时滞长度与树种和土壤含水量显著相关，辽东栎、刺槐在土壤含水量较高时段的时滞长
度分别大于土壤含水量较低时段 32．2 和 68．2 min．时滞长度与径级的相关性整体上未达到显
著水平，但在土壤含水量较低时段小径级刺槐的时滞长度大于大径级 21．4 min，差异达到了显
著水平．两树种液流通量密度与空气水汽压亏缺之间的时滞效应反映了对蒸腾驱动因子的敏
感性，较好的土壤水分条件有利于液流通量密度提早达到峰值，较低土壤水分会导致树干液
流对气象环境因子响应的敏感性降低; 刺槐树干液流受土壤水分的影响更显著． |
| 其他摘要 | Using Granier-type thermal dissipation probes ( TDP) ，we measured stem xylem sap flow
of the natural dominant species Quercus liaotungensis and a reforestation species Ｒobinia pseudoaca
cia from July to September in 2016 in the semiarid loess hilly region． Meteorological factors and soil
water content were simultaneously monitored during the study period． Using cross-correlation analy
sis，time lag between diurnal patterns of sap flux density and vapor pressure deficit ( VPD) was
quantitatively estimated． Differences in the time lag between the two species and possible influence
by different diameter classes and soil water contents were analyzed． The results showed that the diur
nal courses of sap flux density were similar to those of meteorological factors，with daily peaks ear
lier than VPD． The peak of VPD lagged behind the sap flux densities of Q． liaotungensis and Ｒ．
pseudoacacia 118．2 min and 39．5 min，respectively． The peak of PAＲ lagged behind the sap flux
density of Q． liaotungensis 12．4 min，but was 68．5 min ahead of that for Ｒ． pseudoacacia． Time lag
between sap flux density and VPD significantly varied between tree species and was affected by soil
water content． Those during higher soil water content period were about 32．2 min and 68．2 min lon
ger than those during the period with lower soil water content for the two species，respectively．
There was no correlation between time lag and tree diameter classes． The time lag between VPD and
sap flux density for Ｒ． pseudoacacia was about 21．4 min longer in smaller diameter trees than in lar
ger trees，which was significantly different under the lower soil water content． Our results suggested
that the time lag effect between VPD and sap flux densities in the two species reflected their sensi
tivities to driving factors of transpiration，and that higher soil water content was favorable to sap flux
density reaching its peak early． The lower soil water content might lead to lower sensitivity of the
trees to meteorological factors． Ｒ． pseudoacacia was more sensitive to changes of soil water content．
|
| 关键词 | 辽东栎 刺槐 土壤含水量 径级 树干液流 时滞 |
| 收录类别 | 中文核心期刊要目总览 |
| 语种 | 中文 |
| 文献类型 | 期刊论文 |
| 条目标识符 | sbir.nwafu.edu.cn/handle/361005/9324 |
| 专题 | 水保所知识产出(1956---) |
| 作者单位 | 1.西北农林科技大学林学院 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 3.中国科学院水利部水土保持研究所 |
| 推荐引用方式 GB/T 7714 | 杨洁,吕金林,何秋月,等. 黄土丘陵区辽东栎和刺槐树干液流时滞效应 与蒸腾特征的关联性[J]. 应 用 生 态 学 报,2019,30(8):2607-2613. |
| APA | 杨洁,吕金林,何秋月,闫美杰,李国庆,&杜盛.(2019).黄土丘陵区辽东栎和刺槐树干液流时滞效应 与蒸腾特征的关联性.应 用 生 态 学 报,30(8),2607-2613. |
| MLA | 杨洁,et al."黄土丘陵区辽东栎和刺槐树干液流时滞效应 与蒸腾特征的关联性".应 用 生 态 学 报 30.8(2019):2607-2613. |
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