官司河流域不同林分枯落物水源涵养与土壤磁化率  

Water Conservation of Forest Litter and Soil Magnetic Susceptibility in Different Forest Types of Guansi River Watershed

作　　者：冯宇[1] 彭培好[1] 刘贤安[1] 韩子钧[1] 庞溯[2] FENG Yu;PENG Peihao;LIU Xianan;HAN Zijun;PANG Su(College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China;The Engineering ＆ Technical College of Chengdu University of Technology,Leshan 614000,Sichuan)

机构地区：[1]成都理工大学地球科学学院,成都610059 [2]成都理工大学工程技术学院,四川乐山614000

出　　处：《四川农业大学学报》2018年第5期633-639,共7页Journal of Sichuan Agricultural University

基　　金：国家自然科学基金项目(41671432)

摘　　要：【目的】寻找森林生态系统枯落物层水源涵养功能快速评价的新方法。【方法】选择绵阳官司河流域柏木林、马尾松林、麻栎林、松柏混交林作为研究对象,在野外样地调查及室内处理的基础上,分析不同林分林下枯落物水源涵养功能及其与土壤磁化率的关系。【结果】4种林分林下枯落物储量依次为麻栎林(7.77 t/hm^2)>松柏混交林(5.40 t/hm^2)>柏木林(4.43 t/hm^2)>马尾松林(4.03 t/hm^2);林下枯落物最大持水量依次为麻栎林(30.26 t/hm^2)>松柏混交林(19.85t/hm^2)>柏木林(18.14 t/hm^2)>马尾松林(14.62 t/hm^2);单位质量枯落物最大持水量依次为麻栎林(3 094.17 g/kg)>柏木林(3 084.17 g/kg)>松柏混交林(2 633.13 g/kg)>马尾松林(2 622.50 g/kg);4种林分林下枯落物持水量与浸水时间关系满足Q=a ln t+b,林下枯落物吸水速率与浸水时间关系满足S=K tn;林下枯落物储量与土壤磁化率关系满足WL=0.384 MS-4.012 2(R2=0.988 8);林下枯落物最大持水量与土壤磁化率关系满足Q=1.518 7 MS-16.539(R2=0.960 9)。【结论】土壤磁化率可以反映官司河流域不同林分枯落物储量及最大持水量,土壤磁化率越大,对应林分类型枯落物储量及持水量越大,可以指示该森林生态系统枯落物水源涵养功能越强。[Objective] The aim of the study was to find a new method for rapid evaluation of water con servation function of litter layer in forest ecosystem. [Method] Four plantations, including Cupressus funebris ,Pinus masoniana,Quercus ocutissima and pine-cypress mixed forest in the Guansi River Watershed of Mianyang City were selected. The relationships between soil magnetic susceptibility and water conservation function of litter layer in the forest stands were analyzed based on field investigation and lab analysis. [Result] The order of litter stock was 0. ocutissima forest （7.77 t/hm2） 〉pine-cypress mixed forest （5.40 t/hm2） 〉cypress forest （4.43 t/hm2） 〉P. masoniana forest （4.03 t/hm2）. The maximum water-holding capacity of litter layer was Q. acutissima forest （30.26 t/hm2） 〉pine-cypress mixed forest （19.85 t/hm2）〉cypress forest（18.14 t/hm2）〉P, massoniana forest（14.62 t/hm2）. The order of maximum water-holding capacity of litter per unit mass was Q. acutissima forest （3 094.17 g/kg）〉cypress forest （3 084.17 g/kg）〉pine-cypress mixed forest（2 633.13 g/kg）〉P, massoniana forest（2 622.50 g/kg）. The relationship between water-holding capacity of litter and soaking time in four forest types was estimated as Q=a In t＋b and the relationship between water absorption rate of litter and soaking time was calculated as S=Ktn. The relationship between litter reserves and soil magnetic susceptibility was modeled as WL=0.384 Ms-4.012 2 （R2 =0.988 8） and the relationship between maximum water-holding capacity of litterand soil magnetic susceptibility was quantified as Q=1.518 7 Ms-16.539（R2= 0.960 9）. [Conclusion] Soil magnetic susceptibility reflects the litter reserves and maximum water-holding capacity of different forest types in the Guansi River Watershed. The higher the soil magnetic susceptibility, the greater the litter reserves and water-holding capacity of the corresponding forest types, indicating that the water conservation function of litter la

关 键 词：水源涵养 土壤磁化率 枯落物 官司河流域 

分 类 号：S715[农业科学—林学]