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《Science of Soil and Water Conservation》 2008-04
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Relative light intensity and soil water content in different gaps of shrubbery caused by human disturbances

Xue Zhide1,2,Zhang Qiangong3,Zhu Qingke1,Chen Weiping1,4(1.Key Lab.of Soil & Water Conservation and Desertification Combating,Ministry of Education,Beijing Forestry University,100083,Beijing;2.College of Resources and Environment,Northwest A & F University,712100,Yangling,Shaanxi;3.Forestry Bureau of Huanglong Mountain,715700,Huanglong,Shaanxi;4.Institute of Germ Plasm Resources,Academy of A & F Science of Ningxia,750002,Yinchuan,Ningxia: China)  
In order to determine effective gap manner and intensity,effects of relative light intensity and soil water content,the artificial gaps of 2 kinds were studied.The results indicated that daily relative light intensity in leafing and shooting date at fish scale pit surface in closed shrub stand was 44.54%,but less than 10% in growth season;the values in strip-shaped gap were 76.38%,71.92% and 65.70% in the middle of Apr.,in late June and in late Oct.,respectively. The relative light intensity were more than 80% in the early morning(08:00—11:00),and less than 50% in strong sunny hours(13:00—15:00) in growth season,specially.That is advantageous to photosynthesis and avoiding from sunstroke for seeding.The soil water content in strip-shaped gap was more than anyone in shrub in growth season.The strip-shaped gap is efficient to regulating relative light intensity and raising soil water content.
【Fund】: 林业科技支撑计划专题“黄土干旱阳坡抗旱造林与植被恢复技术研究”(2006BAD03A0302);; “十一五”国家科技支撑计划项目“植被优化配置与可持续建设技术”(2006BAD09B03)
【CateGory Index】: S718.5
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