摘要
【目的】探究四川栗子坪国家级自然保护区土壤入渗对不同海拔梯度土壤类型响应特征。【方法】以自然保护区4个海拔梯度(1900、2100、2300和2500 m)土壤为采样对象,通过环刀法测定不同海拔梯度土壤入渗特征,采用通径及相关性分析法明确影响土壤入渗特征的关键因子,并用Kostiakov、Philip、Horton等入渗模型进行拟合,分析其适宜性。【结果】土壤入渗速率与海拔呈极显著负相关关系(P<0.01),而土壤微生物生物量与入渗速率呈显著正相关关系(P<0.05),促进了土壤水分入渗;在入渗前20 min,海拔1900、2100 m土壤入渗率降低了50%左右,海拔2300、2500 m降低了72%~85%,海拔2300、2500 m入渗衰弱速率明显快于海拔1900、2100 m,这主要是受到土壤有机质含量、团聚体粒级结构及微生物生物量影响;模型拟合发现,Kostiakov模型R^(2)为0.896~0.959,Philip模型R^(2)为0.874~0.965,Horton模型R^(2)为0.945~0.984,综合考虑土壤入渗模型决定系数R^(2)大小以及拟合值与实测值精确度的一致性,Kostiakov模型更适合对研究区域土壤入渗进行拟合。【结论】海拔梯度对土壤入渗特征影响显著,主要是受到土壤有机质含量、团聚体粒级结构及微生物生物量等因素影响。
【Objective】The purpose of this study was to explore how soil infiltration responds to different elevation gradients in Liziping National Nature Reserve,Sichuan.【Method】Soil samples were collected from four elevation gradients(1900,2100,2300,and 2500 m)within the nature reserve.Soil infiltration characteristics at these gradients were measured using the ring knife method.Key factors affecting soil infiltration were identified through path and correlation analyses.Additionally,the suitability of infiltration models,including Kostiakov,Philip and Horton,was evaluated by fitting and analyzing the data.【Result】Soil infiltration rates showed a highly significantly negative correlation with elevation(P<0.01).Soil microbial biomass had a significant positive correlation with infiltration rates(P<0.05),promoting water infiltration.In the first 20 min,soil infiltration rates decreased by about 50%at elevations of 1900 and 2100 m,and by 72%to 85%at elevations of 2300 and 2500 m.The rate of infiltration decreased at 2300 and 2500 m was significantly faster that than at 1900 and 2100 m,primarily due to differences in soil organic matter,aggregate grain structure,and microbial biomass.The model fitting showed that the R^(2) values were 0.896-0.959 for the Kostiakov model,0.874-0.965 for the Philip model,and 0.945-0.965 for the Horton model.Based on the R^(2) values and the alignment between fitted and measured values,the Kostiakov model was found to be the most suitable for the study area.【Conclusion】Elevation gradients significantly affect soil infiltration characteristics,primarily influenced by soil organic matter,aggregate grain structure,and microbial biomass.
作者
陆其伟
脱云飞
郑阳
骆伟
代勤龙
何霞红
LU Qiwei;TUO Yunfei;ZHENG Yang;LUO Wei;DAI Qinlong;HE Xiahong(College of Soil and Water Conservation,Southwest Forestry University,Kunming 650224,China;Sichuan Liziping National Nature Reserve Administration,Open Laboratory of Shimian Research Center of Giant Panda Small Population Conservation and Rejuvenation,Liziping Giant Panda's Ecology and Conservation Observation and Research Station of Sichuan Province,Shimian 625499,China)
出处
《南京林业大学学报(自然科学版)》
北大核心
2025年第2期143-152,共10页
Journal of Nanjing Forestry University:Natural Sciences Edition
基金
国家自然科学基金项目(51979134)
四川省栗子坪国家级自然保护区陆生动物生境调查研究项目(2021ZD0125)。
关键词
海拔梯度
土壤理化性质
入渗特征
模型拟合
栗子坪自然保护区
微生物生物量
elevation gradient
soil physical and chemical property
infiltration characteristic
model fitting
Liziping Nature Reserve
microbial biomass
