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《Journal of Beijing Forestry University》 2010-03
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Stumping effects on number and distribution of roots of Caragana microphylla Lam.plantations

ZHENG Shi-guang1;JIA Li-ming1;PANG Qi-wei1;LI Rui2.1 Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing Forestry University,100083,P.R.China;2 Afforestation Bureau of Shanxi Province,Taiyuan,030012,P.R.China.  
Based on a soil column method,growth characteristics of Caragana microphylla roots in stumping plots and control plots(CK) were studied in Pianguan County,a typical Loess hilly region in Shanxi Province.The results showed that,after 4 months of stumping,the amount of roots with diameter(d)﹤10 mm in stumping sites reached(5 635.3 ± 386.6) kg/hm2,a statistically significant increase of 71.11% compared to the CK sites.Especially in soil layers at 0-60 cm depth,the amount of fine roots(d﹤2 mm) and coarse roots(d = 2-10 mm) in stumping sites increased 93.29% and 282.43% compared with those in CK sites.In a level direction,the roots(d﹤10 mm) were mainly distributed near the clusters of C.microphylla in both types of sites.The number of roots at 0.25 m between rows and 0.5 m between trees in stumping sites were 100% and 133.84% greater than those in CK sites.In conclusion,stumping increases root growth of C.microphylla,which is one of the reasons for the promotion of aboveground growth of C.microphylla in stumping sites.It suggests that rational stumping of mature and overmature C.microphylla plantations could promote the restoration and productivity of plantations,increase their production and maximize the effort of energy sources and forage.
【Fund】: 高等学校科技创新工程重大项目(706007);; “十一五”国家科技支撑计划项目(2006BAD18B01)
【CateGory Index】: S793.3
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