广西桉树林表层土壤水分时间稳定性分析
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摘要
为分析桉树林土壤含水量时间稳定性特征,选取桉树林典型坡面,测量坡面9个样点5年土壤含水量,基于所测数据采用相对差分法和Spearman秩相关系数法分析土壤含水率的时空变异性和时间稳定性。结果表明,研究区坡面5年的表层平均土壤含水率为21.81%,在空间上表现为较弱的变异性,在时间上具有中等程度变异性。各年平均土壤含水率相关系数偏低,土壤含水率的空间模式在观测时间上的相似性较弱,其平均相对差分变化范围为-7.08%～5.03%,相对差分标准差和时间稳定性指数的平均值分别为5.73%和6.58%,说明不同坡度条件下土壤水分具有较好的时间稳定性。测点2,3,6,7,8水分含量较平均值高,测点1,4,9,5水分含量相对较低,湿润点的标准差和时间稳定性指数都相对小且稳定,即土壤湿润状态的水分稳定性比干燥状态的好。回归分析得到测点5的土壤含水量和整个坡面水分均值具有较高相关性,R2值为0.879,MBE值为0.141,RMSE值为99.4%,即测点5可作为代表性测点估计整个研究区浅层平均土壤含水率。
In order to analyze the temporal stability characteristics of soil moisture content in Eucalyptus forests,nine sample points on a typical eucalyptus forest slope were selected to measure the soil moisture content for five years.Based on the measured data,the temporal and spatial variability and temporal stability of soil water content were analyzed by relative difference method and Spearman rank correlation coefficient method.The results illustrated that the average surface soil moisture content of five years of the study slope area was 21.81%,which showed weak variability in space and moderate variability in time.The correlation coefficient of average soil moisture content was low in each year,and the spatial pattern of soil water content had weak similarity in observation time,and the variation range of the average relative difference was-7.08%to 5.03%,and the average values of relative difference standard deviation and time stability index were 5.73% and 6.58%,respectively,indicating that the soil moisture had better time stability under different slope conditions.The moisture content of measuring points 2,3,6,7 and 8 were higher than the average value,while the moisture content of measuring points 1,4,9,and 5 were relatively low.The standard deviation and time stability index of the wetting point were relatively small and stable,indicating that the moisture stability of soil in the wet state was better than that in the dry state.According to the regression analysis,there was a high correlation between the soil moisture content of point 5 and the mean water content of the whole slope,with the R2 value of 0.879,the MBE value of 0.141 and the RMSE value of99.4%.In other words,point 5 could be used as a representative measurement point to estimate the average soil moisture content in the shallow layer of the whole research area.
In order to analyze the temporal stability characteristics of soil moisture content in Eucalyptus forests,nine sample points on a typical eucalyptus forest slope were selected to measure the soil moisture content for five years.Based on the measured data,the temporal and spatial variability and temporal stability of soil water content were analyzed by relative difference method and Spearman rank correlation coefficient method.The results illustrated that the average surface soil moisture content of five years of the study slope area was 21.81%,which showed weak variability in space and moderate variability in time.The correlation coefficient of average soil moisture content was low in each year,and the spatial pattern of soil water content had weak similarity in observation time,and the variation range of the average relative difference was-7.08%to 5.03%,and the average values of relative difference standard deviation and time stability index were 5.73% and 6.58%,respectively,indicating that the soil moisture had better time stability under different slope conditions.The moisture content of measuring points 2,3,6,7 and 8 were higher than the average value,while the moisture content of measuring points 1,4,9,and 5 were relatively low.The standard deviation and time stability index of the wetting point were relatively small and stable,indicating that the moisture stability of soil in the wet state was better than that in the dry state.According to the regression analysis,there was a high correlation between the soil moisture content of point 5 and the mean water content of the whole slope,with the R2 value of 0.879,the MBE value of 0.141 and the RMSE value of99.4%.In other words,point 5 could be used as a representative measurement point to estimate the average soil moisture content in the shallow layer of the whole research area.
引文
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[23]魏全帅.红松阔叶混交林林隙丘坑复合体微气候及其分布格局[D].哈尔滨:东北林业大学,2014.
[24]程辉.小尺度石漠化坡耕地土壤属性空间变异研究[D].重庆:西南大学,2013.
[25]Yang L,Wei W,Chen L D,et al.Response of temporal variation of soil moisture to vegetation restoration in semi-arid Loess Plateau,China[J].Catena,2014,115:123-133.
[26]Jia X,Shao M A,Wei X,et al.Hillslope scale temporal stability of soil water storage in diverse soil layers[J].Journal of Hydrology,2013,498:254-264.
[27]Li X Z,Shao M A,Jia X,et al.Landscape-scale temporal stability of soil water storage within profiles on the semiarid Loess Plateau of China[J].Journal of Soils and Sediments,2015,15(4):949-961.
[28]Jia Y H,Shao M A.Temporal stability of soil water storage under four types of revegetation on the northern Loess Plateau of China[J].Agricultural Water Management,2013,117(1):33-42.
[29]李旺霞,陈彦云.土壤水分及其测量方法的研究进展[J].江苏农业科学,2014,42(10):335-339.
[2]Vereecken H,Huisman J A,Franssen H J H,et al.Soil hydrology:Recent methodological advances,challenges,and perspectives[J].Water Resources Research,2015,51(4):2616-2633.
[3]高磊.黄土高原小流域土壤水分时间稳定性及空间尺度性研究[D].北京:中国科学院研究生院(教育部水土保持与生态环境研究中心),2012.
[4]Gómez PA,Alvarez R J,Albaladejo J,et al.Spatial patterns and temporal stability of soil moisture across a range of scales in a semi-arid environment[J].Hydrological Processes,2015,14(7):1261-1277.
[5]Jia X,Shao M A,Wei X,et al.Hillslope scale temporal stability of soil water storage in diverse soil layers[J].Journal of Hydrology,2013,498:254-264.
[6]Gómez P A,Alvarez R J,Albaladejo J,et al.Spatial patterns and temporal stability of soil moisture across a range of scales in a semi-arid environment[J].Hydrological Processes,2015,14(7):1261-1277.
[7]刘泽彬,王彦辉,徐丽宏,等.六盘山华北落叶松林坡面的土壤水分时间稳定性[J].水土保持学报,2017,31(1):153-159.
[8]韩晓阳,刘文兆,程立平.黄土塬区深剖面土壤水分垂直分布特征及其时间稳定性[J].应用生态学报,2017,28(2):430-438.
[9]赵文举,李晓萍,范严伟,等.压砂地土壤水分的时间稳定性研究[J].应用基础与工程科学学报,2015,23(6):1245-1253.
[10]Biswas A,Cresswell H P,Chau H W,et al.Separating scale-specific soil spatial variability:A comparison of multi-resolution analysis and empirical mode decomposition[J].Geoderma,2013,209/210:57-64.
[11]赵其国,黄国勤.广西红壤肥力与生态功能协同演变机制与调控综合报告[M].北京:科学出版社,2015.
[12]庞海恩.广西钦廉林场巨尾桉和红椎人工林对林下植物物种多样性影响的比较研究[D].南宁:广西大学,2018.
[13]朱育锋,肖智华,彭晚霞,等.广西不同龄级桉树人工林植物多样性和群落结构动态变化特征[J].中南林业科技大学学报,2018,38(12):38-44.
[14]李飞宇,梁燕英,石茂鑫.广西桉树人工林生态效益分析与评价[J].安徽农业科学,2017,45(29):161-165.
[15]马倩.不同经营措施对桉树林地植物多样性和土壤肥力的影响[D].南宁:广西大学,2018.
[16]卢婵江.广西东门不同林龄巨尾桉人工林的生物生产力及经济效益分析[D].南宁:广西大学,2017.
[17]俞月凤,彭晚霞,宋同清,等.喀斯特峰丛洼地不同森林类型植物和土壤C、N、P化学计量特征[J].应用生态学报,2014,25(4):947-954.
[18]于婧睿.桉树幼树蒸腾和林地土壤蒸发及入渗研究[D].南宁:广西大学,2016.
[19]刘继龙,马孝义,张振华,等.果园土壤水分时间稳定性研究[J].应用基础与工程科学学报,2014,22(4):698-704.
[20]朱绪超,邵明安,朱军涛,等.高寒草甸生态系统表层土壤水分时间稳定性研究[J].农业机械学报,2017,48(8):212-218.
[21]白一茹,王幼奇,王建宇.黄土丘陵区枣林土壤水分时间稳定性特征[J].应用基础与工程科学学报,2018,26(1):23-34.
[22]李春茂,陈洪松,徐勤学,等.典型岩溶峰丛洼地坡面土壤水分空间变异性[J].中国岩溶,2018,37(2):159-167.
[23]魏全帅.红松阔叶混交林林隙丘坑复合体微气候及其分布格局[D].哈尔滨:东北林业大学,2014.
[24]程辉.小尺度石漠化坡耕地土壤属性空间变异研究[D].重庆:西南大学,2013.
[25]Yang L,Wei W,Chen L D,et al.Response of temporal variation of soil moisture to vegetation restoration in semi-arid Loess Plateau,China[J].Catena,2014,115:123-133.
[26]Jia X,Shao M A,Wei X,et al.Hillslope scale temporal stability of soil water storage in diverse soil layers[J].Journal of Hydrology,2013,498:254-264.
[27]Li X Z,Shao M A,Jia X,et al.Landscape-scale temporal stability of soil water storage within profiles on the semiarid Loess Plateau of China[J].Journal of Soils and Sediments,2015,15(4):949-961.
[28]Jia Y H,Shao M A.Temporal stability of soil water storage under four types of revegetation on the northern Loess Plateau of China[J].Agricultural Water Management,2013,117(1):33-42.
[29]李旺霞,陈彦云.土壤水分及其测量方法的研究进展[J].江苏农业科学,2014,42(10):335-339.