不同土地利用方式下表层土壤稳定入渗速率的时间变化  

Temporal Change of Topsoil Steady State Infiltration Rate Under Different Land Uses

作　　者：郭天崎 黄明斌 朱谧远 Guo Tianqi;Huang Mingbin;Zhu Miyuan(College of Natural Resources and Environment,Northwest A&F University,Yangling,Shaanxi 712100,China;The State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Northwest A&F University,Yangling,Shaanxi 712100,China)

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100

出　　处：《水土保持通报》2023年第2期113-118,共6页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目“重构土壤结构变化对剖面水—溶质耦合迁移过程的影响”(42177287)。

摘　　要：[目的]研究土壤稳定入渗速率(f c)的时间变化规律对土壤剖面水分运动和溶质运移的影响,为流域水文循环模型研究提供理论支持。[方法]以中国科学院长武黄土高原农业生态试验站附近典型的土地利用类型为研究对象,利用双环入渗法采集玉米地、苹果园和刺槐林地2021年4—10月的f c值。[结果]①f_(c)值空间分布的最大相关距离是7.12 m;②土壤容重与f c值呈显著负相关,而土壤初始含水量与f c值无显著相关性(p>0.05);③4—5月各土地利用类型的f c值随时间增加而增加;6—10月,各土地利用类型的f c值随时间的变化特征存在差异,表现为玉米地随时间的增加先增加后下降,苹果园随时间的增加而增大,刺槐林随时间的增加先增大后趋于稳定。方差分析表明,不同土地利用类型的f c值受时间影响显著(p<0.05)。[结论]观测期内,受耕作、降雨、根系活动与土壤干湿交替变化以及枯枝落叶层的影响,不同土地利用方式下f c值的时间变化规律不同。[Objective]The influence of time variation of topsoil steady state infiltration rate(f c)on water movement and solute transport in the soil profile was studied in order to provide theoretical support for the study of the hydrological cycle model in this region.[Methods]The study was conducted on typical land use types near the Loess Plateau Agricultural Ecological Experimental Station of the Chinese Academy of Sciences.The f c values for a corn field,an apple orchard,and a Robinia pseudoacacia forestland were collected from April to October 2021 using the double ring infiltrometer method.[Results]①The maximum correlation distance of f_(c) spatial distribution was 7.12 m.②There was a significant negative correlation between soil bulk density and f c value,while there was no significant correlation between initial soil water content and f c value(p>0.05).③From April to May,the f c value for each land use type increased.From June to October,the f c value for each land use type changed differently with time:f c value for the corn field increased first and then decreased,for the apple orchard increased,and for the Robinia pseudoacacia forestland increased first and then stabilized.Variance analysis showed that the f c values for different land uses were significantly affected by time(p<0.05).[Conclusion]Tillage,rainfall,root activity,and alternation of dry and wet soil and litter resulted in different temporal variations of f c value under different land uses during the observation period.

关 键 词：土地利用方式 稳定入渗率 双环法 时间变化 

分 类 号：S152.5[农业科学—土壤学]