| 摘要: |
| 【目的】寻找樟树蒸腾耗水规律，提高林分水分利用率。【方法】采用热扩散SF-L植物茎流计于2016-2017年生长季（6-9月）连续监测樟树树干液流密度，结合同期气象数据，对樟树树木液流通量及其与气象因子的关系进行了分析。【结果】研究结果表明：（1）在整个生长季，单株樟树树干液流密度日变化存在明显的昼夜节律性，变化曲线呈单峰型，白天液流密度振幅大，清晨与夜晚振幅较小。液流密度的月变化特征为先上升后降低。总体上，2017年平均液流通量明显大于2016年；（2）树干液流通量在晴天日变化曲线呈宽峰型，阴天呈窄峰型，雨天与晴阴天变化曲线无较大差别，但液流通量有所降低；（3）相关性及回归分析结果表明，在一定范围内，液流通量与太阳辐射、空气温度、水汽压亏缺呈显著正相关，与相对湿度呈显著负相关。多元回归分析结果表明，日间、夜间、生长季的主导因子分别为RH、VPD、T；VPD、RH、RS、T和RH、T、RS。【结论】天气条件对樟树蒸腾量影响显著，典型天气条件下蒸腾量大小依次为晴天>阴天>雨天；气象因子与樟树液流变化密切相关，但日间、夜间及整个生长季液流通量的主导因子存在差异。 |
| 关键词: 樟树；液流密度；低丘红壤区；气象因子；相关性 |
| DOI： |
| 分类号:S792.23 |
| 基金项目:国家自然科学基金项目（41575111，41175098）和第九批“六大人才高峰”高层次人才项目（NY-038） |
|
| Variation characteristics of camphor tree flow in low hilly red soil region |
|
Yaohuanhuan1,2, Jingyuanshu1,2
|
|
1.Nanjing University of Information Science&2.Technology
|
| Abstract: |
| [Objective] To find out the transpiration water consumption law of camphor tree and improve the water use efficiency of forest stand. [Methods] The sap flow density of camphor tree was continuously monitored by the thermal diffusion SF-L plant stem flow meter in the 2016-2017 growing season (June-September), and the turf tree liquid fluid flux and meteorological factors were combined with the meteorological data. The relationship was analyzed. [Results] The results showed that: (1) During the whole growing season, there was a significant circadian rhythm of the daily sap flow variability of camphor tree saplings, and the curve showed a unimodal pattern. The amplitude of daytime flow density was large, and the morning and night amplitudes were higher. small. The monthly variation of the liquid flow density is characterized by a rise first and then a decrease. In general, the average liquid flux in 2017 was significantly larger than that in 2016; (2) the daily variation curve of trunk liquid flux on the sunny day showed a broad peak shape, and the cloudy day showed a narrow peak shape. There was no significant difference between the rainy day and the sunny and cloudy days. However, the liquid flux decreased; (3) Correlation and regression analysis showed that within a certain range, liquid flux was significantly positively correlated with solar radiation, air temperature and water vapor pressure deficit, and negatively correlated with relative humidity. The results of multiple regression analysis showed that the dominant factors in daytime, nighttime and growing season were RH, VPD and T, respectively; VPD, RH, RS, T and RH, T and RS. [Conclusion]The weather conditions have significant effects on the transpiration of camphor tree. The transpiration under typical weather conditions is sunny > cloudy > rainy days; meteorological factors are closely related to camphor tree flow changes, but during the day, night and the whole season. There are differences in the dominant factors. |
| Key words: camphor tree ;sapflow density; Low-hilly red soil area; meteorological factor；correlation |
