中国水土保持科学2018，Vol.16Issue(2)：80-87,8.DOI:10.16843/j.sswc.2018.02.011
晋北风沙区人工林土壤水分及粒度特征
Characteristics of soil moisture and grain size in different plantation types in windy and sandy area of North Shanxi
摘要
Abstract
[Background] Windy and sandy region of North Shanxi where the severe water erosion and wind erosion happened is the most extremely frail eco-environment of Shanxi province.In the past few decades,large areas of plantations have been planted here for windbreaks and sand fixation.However,at the same time as it works,plantations can also absorb lots of water from soil and lead to soil desiccation.Jiajiayao catchment,located in Youyu County,is one of the most typical ecological fragile areas in windy and sandy region of North Shanxi province.[Methods] Due to soil moisture and grain size are the limiting factors for ecosystem restoration in this area,based on the field investigation,sampling and measurement,the characteristics of soil moisture and grain size of 6 different plantation types (11-year Pinus tabulaeformis,21-year P.tabulaeformis,23-year Larix principis-rupprechtii,17-year P.tabulaeformis and Caragana korshinskii,C.korshinskii and Hippophae rhamnoides) in Jiajiayao catchment was analyzed in order to provide useful references for vegetation restoration.[Results] 1)There were considerably differences in characteristics of average soil moisture content in 0-100 cm soil profile among different plantation types.Mean soil moisture content of individual plantation type was about 4.62％-8.30％,and showed following sequence:Hippophae rhamnoides ＞ 11-year P.tabulaeformis ＞ C.korshinskii ＞ 17-year P.tabulaeformis and C.korshinskii ＞ 23-year L.principis-rupprechtii ＞ 21-year P.tabulaeformis.Mean soil moisture content in the topsoil (0-20 cm) among 6 plantation types was relatively low.Thereafter the pattern of variation began to be inconstant with the increase of depth.This may be explained by that the antecedent precipitation was in the uniform condition,while affected by plant transpiration,depth and density of root distribution,soil moisture content became complicated in deeper soil layers.2) The grain size characteristic of all 6 plantation types was similar that silt and very fine sand content was the highest.However,silt content was the highest at C.korshinskii and H.rhamnoides,very fine sand content was the highest at the other plantation types.3) The variation tendency of the grain size of different plantation types was not consistent in 0-100 cm soil profile.For the average grain size,the order was:23-year L.principis-rupprechtii ＞ 11-year P.tabulaeformis ＞ 21-year P.tabulaeformis ＞ 17-year P.tabulaeformis and C.korshinskii ＞ H.rhamnoides ＞C.korshinskii.[Conclusions] The water-holding capacity of H.rhamnoides and C.korshinskii was much better than the other plantation types.H.rhamnoides and C.korshinskii should be given priority in the process of vegetation restoration in windy and sandy region of North Shanxi.After years of vegetation restoration,the water consumption of plantations had increased in the study area.It was necessary to carry out the scientific management according to the soil water status,water consumption characteristics,and growth stages of plantations,such as adjusting the vegetation coverage and strengthening the protection of the undergrowth herb layer and litter layer.关键词
土壤水分/土壤粒度/人工林/风沙区Key words
soil moisture/grain size/plantation/windy and sandy area分类
农业科技引用本文复制引用
郭伟,张鸾,刘爽,张凌云..晋北风沙区人工林土壤水分及粒度特征[J].中国水土保持科学,2018,16(2):80-87,8.基金项目
国家青年科学基金项目“晋西北丘陵风沙区不同人工植被恢复模式生态效应研究”(41301609) （41301609）
山西省科技重大专项“晋北沙化土地防治的关键技术研究与试验示范”(20121101011) （20121101011）
国家青年科学基金项目“晋西北丘陵风沙区人工恢复林草植被与土壤水热环境的互馈机制”(41401618) （41401618）
