YANG Yikun.Water Consumption Regularity and Its Environmental Influencing Factors in Different Forests of Jinyun Mountain in Chongqing City[J].Research of Soil and Water Conservation,2020,27(01):126-131,138.
重庆缙云山不同林分耗水动态特征及其环境影响因素
- Title:
- Water Consumption Regularity and Its Environmental Influencing Factors in Different Forests of Jinyun Mountain in Chongqing City
- 文章编号:
- 1005-3409(2020)01-0126-06
- Keywords:
- Jinyun Mountain; forest; transpiration; water use efficiency
- 分类号:
- S715.4
- 文献标志码:
- A
- 摘要:
- 以重庆缙云山为试验站点,于2018年1—12月,采用LI-6400 XT便携式光合测定系统测定了针阔混交林、常绿阔叶林和毛竹林3种典型林分耗水动态特征,定量分析了不同林分蒸腾、蒸发水分利用效率与环境因子的关系。结果表明:缙云山不同林分土壤蒸发量呈“几”字形变化规律,在7—8月达到最大,4—6月呈急剧增加趋势; 9月以后不同林分土壤蒸发量有所降低,相同月份土壤蒸发基本表现为针阔混交林>毛竹林>常绿阔叶林。缙云山不同林分蒸腾速率呈单峰型曲线,1—6月属于缓慢增加趋势,在7—8月达到最大,8月以后急剧降低,11—12月基于平稳趋势,相同月份蒸腾速率基本表现为常绿阔叶林>针阔混交林>毛竹林。不同林分蒸腾速率日变化规律呈单峰型曲线,从早上6:00开始,不同林分叶片蒸腾速率随着一天内光合有效辐射强度的增加、气孔开放而急剧增加,在8:00达到最大值,随后蒸腾速率缓慢降低,相同时间蒸腾速率基本表现为常绿阔叶林>针阔混交林>毛竹林。缙云山不同林分水分利用效率与蒸腾速率变化趋势相一致,二者呈显著的线性关系(p<0.05)。不同林分水分利用效率生理生态因子的相关系数高于蒸腾速率与各生理生态因子的相关系数,其中蒸腾速率和水分利用效率与气孔导度(Gs)、光合有效辐射强度(PAR)均呈显著或极显著的正相关,与空气相对湿度(RH)没有显著的相关性(p>0.05),Gs和PAR对不同林分的蒸腾速率和水分利用效率贡献最大。回归分析表明,不同林分蒸腾速率和水分利用效率与生理生态因子间有线性关系,影响不同林分的蒸腾速率和水分利用效率的主导因素包括Gs和PAR。
- Abstract:
- Taking Jinyun Mountain of Chongqing as the experimental site, we measured the dynamic characteristics of water consumption in three typical stands of mixed coniferous and broad-leaved forest, evergreen broad-leaved forest and bamboo forest by using LI-6400 XT portable photosynthetic assay system from January to December, 2018, and quantitatively analyzed the relationship between transpiration and evaporative water use efficiency and environmental factors. The results showed that soil evaporation in different stands of Jinyun Mountain presented the pattern of several changes, reaching the maximum in July-August and increasing sharply in April-June, after September, soil evaporation in different stands decreased, and soil evaporation in the same month decreased in the order: broad-leaved forest>mixed forest>needle moso bamboo forest; the transpiration rates of different stands in Jinyun Mountain presented a single-peak curve, which increased slowly from January to June, reached the maximum in July to August, and decreased sharply after August, based on the stationary trend in November to December, the transpiration rates in the same month basically decreased in the order: broad-leaved forest>mixed forest>needle moso bamboo forest; different forest transpiration rates showed unimodal type curve change rule since 6:00 am, leaf transpiration rate increased with different within a day of photosynthetic active radiation intensity, stomatal opening, and sharply peaked at 8:00, and then transpiration rate declined slowly, the same time transpiration rate decreased in the order: evergreen broad-leaved forest>mixed forest>needle moso bamboo forest; the variation trend of water use efficiency and transpiration rate in different stands of Jinyun Mountain was consistent. Partial correlation analysis shows that different physiological and ecological factors of forest stand water use efficiency(WUE)correlation coefficient is higher than the transpiration rate and the correlation coefficient of the physiological and ecological factors, the transpiration rate and water use efficiency and stomatal conductance(Gs), intensity of photosynthetic active radiation(PAR)are significant or extremely significant positive correlation, and transpiration rate and water use efficiency have no significant correlation with air relative humidity(RH)(p>0.05), Gs and PAR of different forest stand have the largest contribution to the transpiration rate and water use efficiency. Regression analysis shows that there is a linear relationship between transpiration rate and WUE of different stands and physiological and ecological factors, and the dominant factors affecting transpiration rate and WUE of different stands include Gs and PAR.
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备注/Memo
收稿日期:2019-05-20 修回日期:2019-06-04
资助项目:重庆市教委科学技术研究项目”白及组培育苗技术条件优化研究”(KJ1403309)
第一作者:杨易昆(1984—),男,重庆人,硕士,讲师,研究方向园林植物。E-mail:158000745@QQ.com