| 降雨条件下红椎树干直径微变化特征 |
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| 引用本文： | 刘士玲,郑路,韦菊玲,杨保国,张培,闵惠琳,张继辉,姚建峰,杨文娟.降雨条件下红椎树干直径微变化特征[J].南方农业学报,2021,52(6):1625-1632. |
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| 作者姓名： | 刘士玲 郑路 韦菊玲 杨保国 张培 闵惠琳 张继辉 姚建峰 杨文娟 |
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| 作者单位： | 中国林业科学研究院热带林业实验中心,广西崇左 532600;广西友谊关森林生态系统国家定位观测研究站,广西崇左 532600;中国林业科学研究院热带林业实验中心,广西崇左 532600;中国林业科学研究院资源信息研究所,北京 100091 |
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| 基金项目： | 广西自然科学基金项目（2019GXNSFBA245067）；中国林业科学研究院中央级公益性科研院所基金科研业务费专项（CAFYBB2021MA002）；广西友谊关森林生态系统国家定位观测研究站运行补助项目（2020132055） |
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| 摘 要： | 【目的】了解降雨天气条件下红椎树干直径微变化特征，为开展红椎直径微生长对全球气候变化的响应研究提供基础数据。【方法】试验样地位于广西友谊关森林生态系统国家定位观测研究站实验区范围内，选取3株长势良好的红椎标准木，在树干1.3 m高处安装树干径向变化记录仪，于2019年5—10月连续观测直径微变化过程，同步观测风速、空气温度、降雨、空气相对湿度、光合有效辐射、土壤含水量及土壤温度等环境因子，揭示不同降雨条件下红椎直径微变化特征，并分析不同降雨量级下直径微变化与环境因子的相关性。【结果】2019年研究区域雨季的大气降雨总量为847.90 mm，以降雨量级<10 mm的降雨为主，占总降雨场次的46.88%；降雨量级≥50 mm对总降雨量的贡献最大，占总降雨量的59.19%。观测期间红椎树干日平均直径微生长量为30.65μm，直径总增长量为4383.17μm，大于日平均直径微收缩量（-19.91μm）和直径总收缩量（-796.44μm）。降雨对红椎树干直径变化产生显著（P<0.05，下同）或极显著（P<0.01，下同）影响，不同降雨量级对直径微变化的影响表明:红椎树干直径微变化日周期的峰值出现时间表现为随降雨量级增大而滞后，谷值出现时间表现为随降雨量级增大而提前，振幅表现为随降雨量级增大而减小，且在较大的降雨量级下，树干直径微变化日周期表现为单调增加；连续降雨天气条件下，树干直径持续膨胀，当水分达饱和状态时，其直径出现最大值，连续降雨后的几天，直径出现负增长。降雨天气下，直径微变化与空气湿度呈显著或极显著正相关，与空气温度、饱和水汽压和土壤温度呈显著或极显著负相关关系，与风速、光合有效辐射和土壤含水量的相关性因降雨量级的不同而存在差异。【结论】降雨显著影响红椎树干直径变化，其日变化特征对降雨量级和降雨时长的响应存在差异；在相关环境因子中，空气相对湿度、土壤温度和饱和水汽压对直径变化影响的贡献最显著，且这3个因子对不同降雨条件下的红椎直径微变化均具有控制作用。
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| 关 键 词： | 红椎 降雨 直径微变化 树木径向变化记录仪 |
| 收稿时间： | 2020-11-25 |
Trunk diameter microvariation of Castanopsis hystrix in rainy weather |
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| LIU Shi-ling,ZHENG Lu,WEI Ju-ling,YANG Bao-guo,ZHANG Pei,MIN Hui-lin,ZHANG Ji-hui,YAO Jian-feng,YANG Wen-juan.Trunk diameter microvariation of Castanopsis hystrix in rainy weather[J].Journal of Southern Agriculture,2021,52(6):1625-1632. |
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| Authors: | LIU Shi-ling ZHENG Lu WEI Ju-ling YANG Bao-guo ZHANG Pei MIN Hui-lin ZHANG Ji-hui YAO Jian-feng YANG Wen-juan |
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| Institution: | 1. Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Chongzuo, Guangxi 532600, China;2. Youyiguan Forest Ecosystem Research Station, Chongzuo, Guangxi 532600, China;3. Institute of Forest Resource Information Techniques, Chinese Academy of Forestry, Beijing 100091, China |
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| Abstract: | 【Objective】To reveal the characteristics of diameter microvariation of Castanopsis hystrix trunk in rainy weather, and to provide some basic datas for further research on the response of micro-growth of the trunk diameter to the global climate change.【Method】The experimental plot was within the area of Youyiguan Forest Ecosystem Research Station in Guangxi.Stem diameter microvariation was monitored for three C. hystrix trees using electronic point dendrometers. The instruments were installed on the tree trunks at breast height. Stem diameter microvariation was recorded by a data logger during the period from May to October 2019, and environmental factors such as wind speed, air temperature, rainfall, air relative humidity, photosynthetically active radiation, soil moisture content and soil temperature were measured simultaneously. The characteristics of diameter microvariation of the C. hystrix trunk under different rainfall conditions were revealed, and the correlation analysis method was used to analyze the correlation between the trunk diameter microvariation and environmental factors under different rainfall levels.【Result】In 2019, precipitation was 847.90 mm in the rainy season in this area, mainly with rainfall of <10 mm, accounting for 46.88% of the total rainfall amount. The ≥ 50 mm rainfall contributed the most to the total rainfall, accounting for 59.19%. During the monitoring period, the average daily micro-growth of C. hystrix trunk diameter was 30.65 μm, and the total diameter growth was 4383.17 μm, which was greater than the average daily micro-contraction(-19.91 μm) and the total diameter contraction(-796.44 μm). Rainfall had a significant(P<0.05, the same below) or extremely significant(P<0.01, the same below) effect on diameter variation, and the influence of different rainfall levels on diameter microvariation showed that:the peak occurrence time of daily cycles appeared to lag with increasing rainfall levels, while the valley occurrence time appeared to advance with increasing rainfall levels, meanwhile, the daily growth amplitude of diameter microvariation showed a decrease with increasing rainfall levels, and the daily cycle of microvariation in stem diameter increased monotonously under higher rainfall. Under the condition of continuous rainfall, the diameter of stem continued to expand. When the moisture content of stem reached saturation, the maximum daily diameter appeared. After a few days of continuous rainfall, the diameter appeared negative growth. In rainy weather, there was a significant or extremely significant positive correlation between diameter microvariation and air humidity, and a significant or extremely significant negative correlation between diameter microvariation and air temperature, saturated vapor pressure, soil temperature, and the correlation between diameter microvariation and wind speed, photosynthetically active radiation, soil water content was different with different rainfall classes.【Conclusion】Rainfall has significant effect on diameter variation, and diurnal variation characteristics of diameter has different responses to rainfall classes and rainfall duration. Among the related environmental factors, air relative humidity, soil temperature and saturated water vapor pressure have the most significant contribution to the diameter variation, and they have a controlling effect on the diameter microvariation of C. hystrix trunk under different rainfall conditions. |
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