| 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 |
| |
| 引用本文： | 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]. 生态学杂志, 2017, 28(3): 763-771. DOI: 10.13287/j.1001-9332.201703.034 |
| |
| 作者姓名： | 温杰 陈云明 唐亚坤 吴旭 谢育利 崔高阳 |
| |
| 作者单位： | 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 |
| |
| 基金项目： | 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 |
| |
| 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(Js)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Js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Js(12.62 mL·m-2·s-1)显著高于沙棘(2.60 mL·m-2·s-1).2个树种Js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Js都主要受气象因素影响.9月降水导致SWC对沙棘Js的解释量增加4.2%,而8月和9月的降水导致SWC对油松Js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： | 液流密度 恒水型 变水型 油松 沙棘 |
| 收稿时间： | 2016-07-26 |
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 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 Ecology, 2017, 28(3): 763-771. DOI: 10.13287/j.1001-9332.201703.034 |
| |
| Authors: | WEN Jie CHEN Yun-ming TANG Ya-kun WU Xu XIE Yu-li CUI Gao-yang |
| |
| Affiliation: | 1.College of Fores-try, Northwest A&F University, Yangling 712100, Shaanxi, China ;2.Research Center of Institute of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling 712100, Shaanxi, China ;3.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China |
| |
| Abstract: | The dynamic changes of sap flow density (Js) 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 Js of P. tabuliformis and H. rhamnoides showed a single peak during both pre- and post-precipitation. The Js 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 Js of these two species were significantly positively correlated with photosynthetic active radiation, vapor pressure deficit, soil volume-tric water content (SWC). The Js 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 Js of H. rhamnoides increased by 4.2% after precipitation in September, but the contribution of SWC to Js 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. |
| |
| Keywords: | sap flow density isohydry anisohydry Pinus tabuliformis Hippophae rhamnoides. |
|
| 点击此处可从《生态学杂志》浏览原始摘要信息 |
|
点击此处可从《生态学杂志》下载全文 |
|
