摘要
对黄土丘陵半干旱区人工沙棘林冠层、枯枝落叶层、根系土壤层的水文水保作用的研究结果表明:7～10龄沙棘林冠平均年截留率为8.5%;5～10龄沙棘林地枯枝落叶层单次可截留0.89mm的降水。和农地相比,沙棘成林、幼林分别可减小50cm、25cm土层深度的容重。沙棘枯枝落叶层自身和覆盖土壤具有增强土壤抗冲刷的能力,林地覆盖2cm以上厚度的枯枝落叶层可保护表层土壤免受降水侵蚀;沙棘林具有增强土壤抗冲刷和侵蚀的性能,其中:抗冲性能的强弱与同土层中毛根数量呈显著的幂相关,抗蚀性能的强弱与土层中腐殖质含量有关。
Based on the study of hydrology and soil and water conservation effects of canopy,litter layer and root system and soil layer of artificial seabuckthorn stands in semiarid area of Loess Hilly and Gully Region.The results have showed as follow.Average intercepting rate of canopy on rainfall in 7~10 ages seabuckthorn stands is 8.5%.Intercepting maximum of litter layer of 5~10 ages seabuckthorn forest is 0.89 mm in single rainfall.Compared with farmland,mature and young seabuckthorn stands can decrease soil cubic density in 0~50 cm and 0~25 cm depth of soil layer respectively.Litter self and coving litter layer above soil can increase the capability of soil antiscour,the surface soil can avoid the erosion by rainfall to cover the litter layer excess 2 cm thickness on it.Seabuckthorn forest has the capability of increasing the soil antiscouring and antieroding.The capability of antiscour has a power relationship with the number of thin roots in the same soil layer and the capability of antierosion has relation with the content of humus in the same soil layer.
出处
《西北植物学报》
CAS
CSCD
2003年第8期1357-1361,共5页
Acta Botanica Boreali-Occidentalia Sinica
基金
中国科学院知识创新工程重大项目(KZCX1-06-01-03)
黄土高原林木培育实验室和国家"十五"科技攻关项目(2001BA508B17)
关键词
人工沙棘林
黄土丘陵区
水文作用
水土保持
机理
artificial seabuckthorn forest
Loess Hilly Region
hydrological effect
soil and water conservation
mechanism
