子午岭林区油松人工林枯落物水文生态功能研究  

Hydrological and Ecological Functions of Litter of Pinus Tabuliformis Plantation in Ziwuling Forest Region

作　　者：王彦宁 王娜 徐丽恒 孙于卜 WANG Yanning;Wang Na;XU Liheng;SUN Yubo(Gansu Ziwuling Forestry Administration Ningxian Branch,Qingyang Gansu 745000,China;Qingyang Forestry Research Institute,Qingyang Gansu 745000,China;College of Life Sciences and Technology,Longdong University,Qingyang Gansu 745000,China)

机构地区：[1]甘肃省子午岭林业管理局宁县分局,甘肃庆阳745000 [2]庆阳市林业科学研究所,甘肃庆阳745000 [3]陇东学院生命科学与技术学院,甘肃庆阳745000

出　　处：《甘肃林业科技》2023年第3期8-13,共6页Journal of Gansu Forestry Science and Technology

基　　金：庆阳市森林生态碳汇计量开发体系研究(QY-STK-2022A-034);黄土高原子午岭低效油松林判别及结构优化(QY-STK-2022B-113);子午岭森林生态系统服务功能提升研究(XYBY202002)。

摘　　要：研究子午岭林区不同林龄油松人工林枯落物的水文生态功能,为该区人工林经营及植被建设提供理论依据。在甘肃省子午岭林区选取树龄为10a、20a和30a的油松人工纯林,分析其枯落物的水文特征指标。结果表明:(1)油松人工林枯落物的厚度和蓄积量均随林龄升高逐渐增大,总厚度为1.63~7.30cm,总蓄积量为6.37~52.41t/hm^(2);(2)枯落物的最大持水率和有效拦蓄率均表现为10 a>20a>30a;而最大持水量和有效拦蓄量均表现为30 a>20 a>10 a,枯落物的水源涵养功能随树龄的增长而逐渐增强,且枯落物半分解层在降雨截留拦蓄过程中发挥主要作用;(3)枯落物的持水量、吸水速率与浸水时间分别呈对数函数关系(R^(2)>0.926)和幂函数关系(R^(2)>0.998)。The hydrological ecological function of litters of Pinus tabuliformis plantation of different ages in the Ziwuling was determined in order to provide a theoretical basis for plantation management and vegetation construction.The pure plantation of Pinus tabulaeformis with tree age of 10 years,20 years and 30 years was selected in Ziwuling forest region of Gansu Province,the hydrological characteristics of litter were analyzed.The results showed that:(1)The thickness and volume of litters increased gradually with the increase of forest age.The total thickness ranged from 1.63 cm to 7.30 cm,and the total volume ranged from 6.37 t/hm^(2)to 52.41 t/hm^(2).(2)The maximum water-holding rate and effective interception rate of litter were 10 a>20 a>30 a.The maximum water-holding capacity and effective interception amount of litter were 30 a>20 a>10 a.The water conservation function of litter gradually increased with the increase of tree age,and the semi-decomposed layer of litter played a major role in the'interception and retention of rainfall.(3)The water-holding amount,water absorption rate,and soaking time showed logarithmic responses(R^(2)>0.926)and a power function response(R^(2)>0.998),respectively.

关 键 词：子午岭 油松 人工林 枯落物 水文生态 

分 类 号：S715.7[农业科学—林学]