文献类型：期刊文献

中文题名：六盘山半干旱区华北落叶松林土壤水分对降雨的响应

英文题名：Response of soil moisture to rainfalls in a semi-arid larch forest in Liupan Mountains

作者：王正安[1,2];邸利[1];王彦辉[2];李振华[3];韩新生[4]

第一作者：王正安

机构：[1]甘肃农业大学资源与环境学院,兰州730070;[2]中国林业科学研究院森林生态环境与保护研究所,国家林业局森林生态环境重点实验室,北京100091;[3]新乡学院生命科学技术学院,新乡453000;[4]宁夏农林科学院荒漠化治理研究所,银川750002

第一机构：甘肃农业大学资源与环境学院,兰州730070

年份：2018

卷号：32

期号：4

起止页码：144-151

中文期刊名：干旱区资源与环境

外文期刊名：Journal of Arid Land Resources and Environment

收录：北大核心:【北大核心2017】；CSSCI:【CSSCI2017_2018】；CSCD:【CSCD2017_2018】；

基金：国家自然科学基金项目(41471029、41671025、41230852、41461112、31660235); 宁夏回族自治区生态修复与多功能林业综合研究中心、国家林业局宁夏六盘山森林生态站资助

语种：中文

中文关键词：半干旱区;华北落叶松林;降雨响应;土壤含水量

外文关键词：semi - arid region ; moisture response ; Larix principis - rupprechtii ; soil water content

摘要：研究土壤水分对不同量级降雨的响应,探讨森林生态系统的土壤水分形成与消耗规律,可为我国干旱半干旱地区基于土壤水分承载力的森林植被建设和水土资源管理提供依据。在宁夏六盘山北侧半干旱区,利用气象站及土壤水势仪监测并分析了2010年生长季(5-10月)58次降水事件及华北落叶松林地根系分布层(0-60cm)各层土壤水分的响应过程。结果表明:华北落叶松林土壤水分变化与降水关系密切,土壤含水量峰型与降雨分布格局较为一致,月均土壤含水量(%)与月降水量(mm)呈极显著正相关(R=0.573,P<0.01)。不同深度处的土壤水分对降水量级的响应有差异,在小雨条件下,0-10cm土层的累计降水量响应阈值为7mm;在中雨条件下,0-10、10-20cm土层的累计降水量响应阈值为10和25mm;在大雨条件下,0-10、10-20、20-40cm土层的累计降水量响应阈值依次为8、22和36mm;在暴雨条件下,0-10、10-20、20-40、40-60cm土层的累计降水量响应阈值依次为12、29、37和63mm;随土层向深处,响应变幅呈减少趋势,对降水的响应滞后时间逐渐增加;在小雨和中雨条件下,侧向流不明显,但在大雨条件下侧向流趋势明显,最大为7.88mm。综上可知,土壤含水量的变化幅度随土层深度增加,各层次呈减小趋势,土壤含水量与降雨的同步性呈下降趋势且各层响应存在时间的滞后性。
To study the response of soil moisture to different levels of precipitation and explore the formation and consumption of soil water in forest ecosystem can provide the basis for forest vegetation construction and water and soil resources management in arid and semi - arid areas based on soil water carrying capacity. In the semi - arid area on the north side of Liupan Mountain in Ningxia, the 58 precipitation events and the soil moisture respond process in the root system distribution zone （0 - 60cm） of Larix principis - rupprechtii in growing season （ from May to October, 2010） were monitored and analyzed by meteorological station and soil water potential meter. The results showed that the change of soil water moisture was closely related to the precipitation, and distribution pattern of soil water content peak was consistent with the precipitation distribution; the relationship between monthly mean value of soil moisture （ % ） and monthly precipitation （mm） was characterized as significantly posi- tive correlation（ R =0. 573 ,P 〈0.01 ）. The response of soil moisture at different depths to precipitation was dif- ferent. Under the condition of light rain, the cumulative precipitation response threshold of 0 - 10cm soil layer was 7mm. Under the moderate rain condition, the soil response thresholds were 10 and 25mm corresponded with the cumulative rainfall 0 - 10 and 10 - 20cm, respectively. Under the heavy rain condition, the soil response thresholds were 8, 22 and 36ram corresponded with the cumulative rainfall 0 - 10,10 -20, and 20 -40cm, respectively. Under the storm conditions, the soil response thresholds were 12,29,37 and 63mm corresponded with the cumulative rainfall 0 - 10cm, 10 - 20,20 - 40, and 40 - 60cm, respectively. With the increasing of soil depth, The response luffing showed a decreasing trend and the retardation time acted on rainfalt was gradually increased. Under the condition of small rain and middle rain, the lateral flow was obvious, but the trend was obvious under heavy rain condition, and the maximum was up to 7.88mm. To sum up, With the increasing of depth, the variation of soil moisture content of each layer showed a decreasing trend, and the synchronicity between the volumetric soil water content and rainfall showed a declining trend, and the soil layer＇s response to rainfall existed a time lag.