摘要
优先流作为土壤入渗的重要组成,影响着人工林水源涵养能力,同时驱动营林措施造成的土壤污染物快速向下迁移,对地下水水质产生威胁。因此,开展人工林优先流发育特征研究可为其可持续经营提供科学依据。以广西融水贝江河林场不同林龄杉木人工林为对象,采用亚甲基蓝染色示踪法,探究杉木人工林优先流特征,通过多指标评价法,评估不同林龄杉木人工林优先流相对发育程度。结果表明:杉木人工林土壤染色程度随土壤深度增加而减小,主要入渗区域为0~20 cm;杉木人工林土壤水流入渗方式主要以侧向优先流为主,且入渗开始时即有优先流发生;不同林龄杉木人工林优先流评价指数为5年生(0.64)>8年生(0.59)>11年生(0.47)>15年生(0.39)。研究发现,杉木人工林入渗过程侧向优先流占主导地位,优先流发育程度呈现随林龄增加而减小的趋势,研究结果可为杉木人工林营林措施制定提供科学依据,促进人工林可持续经营。
Preferential flow,a critical component of soil infiltration,affects water conservation capability of forest plantations,and threatens groundwater quality by facilitating the rapid downward migration of soil pollutants genera⁃ted by forestry practices.Therefore,understanding the developmental characteristics of preferential flow during the rotation period of plantations can provide a scientific basis for their sustainable management.We investigated prefer⁃ential flow characteristics during the rotation period of Chinese fir plantations in the Beijiang River Forest Farm in Rongshui,Guangxi,using methylene blue dye tracing.A multi⁃index evaluation method was employed to assess the relative development degree of preferential flow in Chinese fir plantations of different ages.The results showed that soil dyeing in Chinese fir plantations decreased with increasing soil depth,with the main infiltration area being 0-20 cm.The lateral preferential flow was the dominant infiltration mode of the soil infiltration process,which occurred at the beginning of infiltration.The preferential flow indicators for different aged Chinese fir plantations were in the order of 5⁃year⁃old(0.64)>8⁃year⁃old(0.59)>11⁃year⁃old(0.47)>15⁃year⁃old(0.39).Our results indicated that lateral preferential flow predominates in the infiltration process of Chinese fir plantations,and that the degree of preferential flow development decreases with increasing forest age.The findings can provide a the⁃oretical basis for the formulation of scientific forest management measures in Chinese fir plantations,and thereby can promote the sustainable management of plantations.
作者
邓莹莹
廖煜亮
容清标
杨梦格
谭青芳
赵明全
潘天森
黄钰涵
DENG Yingying;LIAO Yuliang;RONG Qingbiao;YANG Mengge;TAN Qingfang;ZHAO Mingquan;PAN Tiansen;HUANG Yuhan(Guangxi Key Laboratory of Forest Ecology and Conservation,College of Forestry,Guangxi Uni-versity,Nanning 530004,China)
出处
《生态学杂志》
北大核心
2025年第2期389-395,共7页
Chinese Journal of Ecology
基金
广西科技基地和人才专项(桂科AD22035032)
广西重点研发计划项目(桂科AB22080103)
广西自然科学基金项目(2021GXNSFBA196020)资助。
关键词
人工林
优先流
染色示踪
多指标评价
forest plantation
preferential flow
dye tracing
multi⁃index evaluation
