摘要
文章主要分析研究了青海省大通县不同退耕年限云杉林+中国沙棘植被根系状况、土壤容重、入渗性能及抗冲性能,同时在一定范围内指出了前三者对后者的影响及相互关系。结果表明:随着退耕年限的延长,地下根系逐渐增多,土壤容重逐渐减小,初渗率、稳渗率、抗冲性能呈逐渐增大的趋势。与农耕地相比,土壤表层(0～20cm)有效根(根茎<1mm)对土壤抗冲性能的强化值,按照退耕年限(8年,14年,19年,27年,50年,55年)依次为25.94%,36.42%,63.40%,137.04%,415.17%,708.13%。土壤表层(0～20cm)容重、稳渗率与土壤抗冲性的皮尔逊相关均达0.01显著水平;表层<1mm根系密度与抗冲性以及与其对抗冲性的增强值的变化规律分别符合指数方程y=0.6662e6E-06x、y=12.228e1E-05x,相关系数分别为0.9586,0.9784。
The article mainly researched properties of roots,Soil bulk density,soil permeability and soil anti-scourability of vegetation of the spruce forest ＋Chinese seabucksor at different time of returuing crop land to forest in DaTong County of QingHai.lt also includes the influence and correlation among the first three and last factors. The results show that were as follows： As time lasts, underground roots increases,soil bulk density reduces,the first and final infiltration rate and soil anti-scourability have a crescent trend. Comparing with cropland, soil anti-scourability of available roots（diameter of roots〈1mm） in surface soil（0-20cm） was increased by 25.94%, 36.42%, 63.40%, 137.04%, 415.17%, 708.13%.The soil anti -scourability has remarkable Pearson correlation with soil bulk density and final infiltration rate;The change rule of rooting density and soil anti- scourability, added value of soil anti-scourability could be demonstrated by following functions：y=0.6662e^6E-06x、y=12.228e^1E-05x and the correlation coefficient respectively is 0.9586,0.9784.
出处
《华北农学报》
CSCD
北大核心
2005年第F12期85-90,共6页
Acta Agriculturae Boreali-Sinica
基金
"十五"国家科技攻关项目(2001BA510B01)
关键词
退耕还林
云杉林
渗透性
抗冲性
Conversion from cropland into forest land
The QingHai spruce forest
Soil permeability
Soil anti-scourability
