摘要
为比较不同坡位林地土壤水分物理性质的差异,选择冀西北张家口市涿鹿林场的白桦和华北落叶松2种纯林,在坡上、坡下分别取样进行土壤水分物理性质的测定和比较。结果表明:(1)白桦林土壤容重为0.66~1.17 g·cm^(-3),华北落叶松林为0.79~1.16 g·cm^(-3),2种林分土壤容重均为坡上>坡下,土壤容重均随土层深度的增加而增加,白桦林坡上与坡下土壤容重差异不显著(P>0.05),华北落叶松林坡上与坡下差异显著(P<0.05)。(2)2种林分土壤总孔隙度、毛管孔隙度和非毛管孔隙度均为坡下>坡上,坡位与孔隙度呈极显著正相关,坡上与坡下土壤总孔隙度差异显著。(3)白桦林与华北落叶松林土壤饱和持水量总体随土层深度增加而减小,土壤饱和持水量、毛管持水量和有效持水量均为坡下>坡上,2种林分坡上与坡下饱和持水量相关性及差异性均极显著。(4)2种林分土壤容重与持水量、孔隙度均极显著负相关,土壤持水量与总孔隙度极显著正相关。
In order to compare the difference of soil hydro-physical properties of forestland in different slope positions,two pure forests,Betula platyphylla and Larix principis-rupprechtii were selected from Zhuolu Forest Farm of Zhangjiakou City in northwest Hebei Province.Samples were taken on the upper and lower slopes respectively to measure and compare the soil physical properties.The results showed as the following four aspects.(1)Soil bulk density of Betula platyphylla forest was 0.66-1.17 g·cm~(-3),and that of Larix principis-rupprechtii forest was 0.79-1.16 g·cm^(-3).The soil bulk density of the two stands showed upslope downslope,and the soil bulk density increased with the increase of soil depth,but there was no significant difference between the upslope and downslope of Betula platyphylla forest(P> 0.05).There were significant differences between the upper and lower slopes of Larix principis-rupprechtii forest(P <0.05).(2)The total soil porosity,capillary porosity and non-capillary porosity of the two stands were all downslope upslope,and there was a highly significant positive correlation between slope position and porosity,and there was a significant difference between the total soil porosity of the upper and lower slopes.(3)The soil saturated water holding capacity of Betula platyphylla forest and Larix principis-rupprechtii forest generally decreased with the increase of soil depth.And the soil saturated water holding capacity,capillary water holding capacity and effective water holding capacity all showed downward slope upward slope.The correlation and difference of saturated water holding capacity between the upper and lower slopes of the two stands were extremely significant.(4)Soil bulk density of the two stands was negatively correlated with water holding capacity and porosity,while soil water holding capacity was positively correlated with total porosity.
作者
姚丽芳
Yao Lifang(Hebei Mulan Paddock State-owned Forest Farm,Chengde 068450,China)
出处
《防护林科技》
2023年第4期68-71,共4页
Protection Forest Science and Technology
基金
中央财政林业科技推广示范资金项目“标准化水源保护林营造及经营示范区建设”(冀sfq[2020]003号)
河北省林业和草原局科技推广示范项目“冀北山区森林生态系统健康经营技术推广示范”(冀LT[2021]004号)。
关键词
坡位
林地土壤
土壤水分物理性质
土壤容重
土壤持水量
slope position
soil hydro-physical properties
soil bulk density
soil water holding capacity
