毛乌素沙地长柄扁桃林地土壤水分时间稳定性  

Temporal stability of soil moisture of Amygdalus pedunculate woodland in Mu Us sandy land

作　　者：赵鑫 朱超 郑云珠 李婷婷 于娜 田晓飞 翟胜[1] 孙树臣[1] ZHAO Xin;ZHU Chao;ZHENG Yunzhu;LI Tingting;YU Na;TIAN Xiaofei;ZHAI Sheng;SUN Shuchen(School of Environment and Planning,Liaocheng University,252059,Liaocheng, Shandong,China;Human Resources Department,Liaocheng University,252059,Liaocheng,Shandong,China)

机构地区：[1]聊城大学环境与规划学院,山东聊城252059 [2]聊城大学人力资源处,山东聊城252059

出　　处：《中国水土保持科学》2021年第6期8-17,共10页Science of Soil and Water Conservation

基　　金：国家自然科学基金“沙漠长柄扁桃林地水量平衡的试验研究”(41701243);“基于N15示踪的包膜尿素对棉田土壤氨挥发的影响研究”(41807092);聊城大学博士基金“农田土壤水量平衡对生物炭添加的响应机理研究”(318051748)。

摘　　要：为揭示毛乌素沙地人工林土壤水分时间稳定性特征,于2018年3月—2019年10月利用CNC503DR型中子仪对毛乌素沙地东南缘固定沙丘长柄扁桃林地中30个测点的0~300 cm剖面土壤含水量连续测定,运用经典统计学和时间稳定性分析方法,研究不同深度土层土壤水分时空变异和时间稳定性特征。结果表明:1)监测期间,各土层土壤含水量在时空上均属中等变异,0~50 cm土壤含水量较低且时间变异性较强,200~300 cm土壤含水量较高空间变异性较强,并与其他各层差异显著(P<0.05);2)0~300 cm土壤水分Spearman秩相关系数均呈极显著相关,2018年土壤水分秩相关系数大部分在0.6以上,表现出一定的时间稳定性特征;3)基于累计概率和相对差分分析,土壤水分时间稳定性随土层深度增加而增大,200~300 cm土层土壤水分时间稳定性较强,各土层代表性测点平均土壤含水量与研究区各土层平均土壤含水量R^(2)介于0.63~0.90之间,可利用代表性测点较精确估算研究区各土层平均土壤含水量;4)水量平衡分析表明,研究区降水量能够满足长柄扁桃灌丛正常生长。长柄扁桃灌丛小区土壤水分表现为正平衡,各测点土壤水分时间稳定性随土层深度增加而增强且代表性测点能较准确的预测各测点0~300 cm平均土壤含水量。[Background]In arid and semi-arid regions,soil moistureis the core of ecosystem in sandy land,driving material circulation and energy flow in the soil-plant-atmosphere continuum(SPAC)system.However,Mu Us sandy land was located in arid and semi-arid areas,and the inter-annual variability of precipitation is large.There have been few studies on the interaction relationship between between Amygdalus pedunculate and soil moisture,especially the analysis of the temporal and spatial variability and temporal stability of soil moisture in this area after the large-scale planting of A.pedunculate is still unclear.[Methods]From March 2018 to October 2019,the soil moisture contentsof 30 water points in the 0-300 cm section of the A.pedunculate woodland of the fixed dune on the southeast edge of Mu Ussandy land was continuously measured with a CNC503DR neutron.The spatiotemporal variability and temporal stabilities of soil moisture at different depths were studied using classical statistics and temporal stability analysis,and the data processing tool adopted SPSS and Excel 2016.[Results]1)The soil layers showed a medium variance during the period of measurement.The soil moisture content of 0-50 cm was low and the temporal variability was strong.The soil moisture content in 200-300 cm was higher and the spatial variability was stronger,which was significantly different from other layers.2)Spearman rank correlation coefficient of soil moisture content(0-300 cm)was extremely significant.Most rank correlation coefficient of soil moisture content in2018was more than 0.6 and showed a certain temporal stability.3)The mean relative difference ranges of 0-50,50-100,100-200 and 200-300 cm were respectively-23.69%-32.47%,-28.4%-42.14%,-25.65%-74.61%and-72.02%-147.03%,andmean standard deviation ofits relative differences were 14.12%,9.80%,21.40%,9.52%,respectively.Based on the cumulative probability and relative difference analysis,the temporal stability of soil moisture content increasedwith the increase of soil depth,andthe temporal s

关 键 词：土壤含水量 时间稳定性 时空变异 毛乌素沙地 

分 类 号：S152.7[农业科学—土壤学]