降雨特征对红锥人工林降水分配格局的影响

生态学杂志

降雨特征对红锥人工林降水分配格局的影响

雷丽群^1,2,郑路^1,2*,农友^1,2,刘士玲^1,2,李华^1,2,黄德卫^1,2

(¹中国林业科学研究院热带林业实验中心，广西凭祥 532600；²广西友谊关森林生态系统国家定位观测研究站，广西凭祥 532600)

出版日期:2020-02-10 发布日期:2020-02-10

Effects of rainfall characteristics on rainfall partitioning in Castanopsis hystrixplantation.

LEI Li-qun^1,2, ZHENG Lu^1,2*, NONG You^1,2, LIU Shi-ling^1,2, LI Hua^1,2, HUANG De-wei^1,2

(¹Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, Guangxi, China; ²Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532600, Guangxi, China).

Online:2020-02-10 Published:2020-02-10

摘要/Abstract

摘要： 明析红锥人工林降雨特征对降水分配格局的影响，为南亚热带人工林可持续经营提供基础支撑。以34年生红锥人工林为研究对象，测定了2017年1—12月的大气降水、穿透雨和树干茎流。结果表明：年降雨总量945.9 mm，穿透雨、树干茎流、林冠截留分别占大气降水的43.9%、0.5%、55.6%。产生穿透雨和树干茎流的最小降雨量分别为0.6和3.8 mm。降水分配格局具有季节波动性，穿透雨率夏季最小，冬季最高，树干茎流率和林冠截留率则反之。小而短的降雨事件导致低的净雨量输入和高的林冠截留量。4个降雨因子中(降雨量、降雨强度、降雨历时和雨前干燥期)，降雨量是对降水分配格局最具影响力的变量，降雨强度对树干茎流率有显著影响，降雨历时对穿透雨率和林冠截留率有显著影响，而雨前干燥期对降水分配格局中的3个分量均没有显著性影响。多元线性回归分析表明，降水分配格局中的3个分量对降雨特征的响应并不是同步的，树干茎流受降雨特征的影响小于穿透雨和林冠截留。

关键词: 生态廊道, 功能连接度, 最小成本路径, 夹点, 电路理论

Abstract: To provide basic hydrological data for sustainable management of south subtropical forest plantations, we measured rainfall, throughfall and stemflow in a 34year old Castanopsis hystrix stand in Guangxi Youyiguan Forest Ecosystem Research Station from January to December 2017. The results showed that total annual rainfall was 945.9 mm, with throughfall, stemflow and canopy interception accounting for 43.9%, 0.5% and 55.6% of total rainfall, respectively. The minimum rainfall that produced throughfall and stemflow was 0.6 and 3.8 mm, respectively. Rainfall had seasonal fluctuation, with the penetration rate being the lowest in summer and the highest in winter, and the stemflow rate and canopy interception rate showing opposite pattern. Small and short rainfall events led to low net rainfall input and high canopy interception. Among the four rainfall factors (rainfall amount, rainfall intensity, rainfall duration, and pre-rain drying period), rainfall amount had the strongest effect on rainfall distribution pattern. Rainfall intensity had a significant impact on stemflow rate. Rainfall duration had a significant impact on throughfall rate and canopy interception rate. Pre-rain drying period had no significant impact on the three components of rainfall distribution pattern. Results of multiple linear regression analysis showed that the response of the three components of rainfall partitioning to rainfall characteristics was not synchronized, with stemflow being less affected by rainfall characteristics than throughfall and canopy interception.

Key words: least cost path, ecological corridor., pinch point, circuit theory, functional connectivity

雷丽群,郑路,农友,刘士玲,李华,黄德卫. 降雨特征对红锥人工林降水分配格局的影响[J]. 生态学杂志.

LEI Li-qun, ZHENG Lu, NONG You, LIU Shi-ling, LI Hua, HUANG De-wei. Effects of rainfall characteristics on rainfall partitioning in Castanopsis hystrixplantation.[J]. cje.

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