摘要
为充分了解水蚀风蚀交错区典型林地土壤水分差异性及其生态水文效应,选择陕西省延安市吴起县水蚀风蚀交错区长城镇退耕还林后形成的典型人工林(小叶杨、山杏、山桃、柠条、河北杨和沙棘林)为研究对象,采用烘干法测定土壤含水量,分析0~300 cm土层土壤水分季节变化特征、贮水量特征和土壤贮水亏缺程度。结果表明:在0~300 cm土层,6种林地土壤水分具有明显的垂直变异特征,即随着土层深度的增加,土壤含水量先升高后降低;6种林地各土层的土壤含水量均具有明显的季节变化特征,且变异系数在表土层较大,随着深度的增加而减小;6种林地土壤水分活跃层存在一定的差异性;其中,沙棘林土壤水分活跃层最深(0~80 cm),其它林地相对较浅(20~40 cm);在0~100 cm土层,各林地土壤贮水量垂直变化趋势差异较大,且小叶杨、河北杨与沙棘林差异显著(P<0.05),沙棘各季节土壤贮水量随着土层深度的增加呈现先增大后减小的趋势。不同植被类型土壤贮水亏缺度存在差异,土壤水分亏缺度在季节上表现为秋季>春季>夏季。
To study the characteristics of soil moisture deficit under different vegetation types in a water-wind erosion crisscross area,this study chose six typical forests(Populus simonii,Armeniaca sibirica,Amygdalus davidiana,Caragana korshinskii,Populus hopeiensis,and Hippophae rhamnoides)in Wuqi County,Yan’an City,Shaanxi Province,as the research targets.Based on an analysis of the dynamic change characteristics of forest soil moisture,the study aimed to provide a basis for high-quality and sustainable development of water and soil conservation in vegetated areas.The results showed that the soil moisture in the 0-300 cm soil layer of the six forest lands exhibited significant vertical variation.It first increased and then decreased as soil depth increased.The soil moisture of each soil layer in the six forest lands exhibited clear seasonal variations.The top soil layer exhibited a high coefficient of variation,and this coefficient decreased as soil depth increased.Moreover,there were differences in the soil moisture active layer of the six forest lands.Among these forests,the soil moisture active layer was deepest in H.rhamnoides forest(80 cm),and other vegetation types had relatively shallow(20-40 cm)active layers.In the 0-100 cm soil layer,the vertical variation trends in soil water storage differed considerably among forest lands.There were significant differences among P.simonii,P.hopeiensis,and H.rhamnoides(P<0.05).The soil water storage of H.rhamnoides in each season increased first and then decreased as soil depth increased.The water storage deficits of different vegetation types were significantly different;the degree of the soil water deficit in different seasons was in the order of autumn>spring>summer.
作者
艾宁
张智勇
宗巧鱼
刘长海
刘广全
AI Ning;ZHANG Zhiyong;ZONG Qiaoyu;LIU Changhai;LIU Guangquan(College of Life Science,Yan’an University,Yan’an,Shaanxi 716000,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Shaanxi Key Laboratory of Chinese Jujube,Yan’an University,Yan’an,Shaanxi 716000,China)
出处
《森林与环境学报》
CSCD
北大核心
2021年第3期272-280,共9页
Journal of Forest and Environment
基金
“十三五”国家重点研发计划(2016YFC0501602,2016YFC0501705)
国家自然科学基金项目(32060297)
陕西省自然科学基础研究计划项目(2021JQ-626)
延安市科技计划项目(2019ZDQY-036)。
关键词
水蚀风蚀交错区
植被类型
土壤水分
土壤水分亏缺度
water-wind erosion crisscross area
vegetation types
soil moisture
soil moisture deficit
