平茬对柠条林地根系数量和分布的影响  

Stumping effects on number and distribution of roots of Caragana microphylla Lam.plantations

作　　者：郑士光[1] 贾黎明[1] 庞琪伟[1] 李锐 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室 [2]山西省造林局

出　　处：《北京林业大学学报》2010年第3期64-69,共6页Journal of Beijing Forestry University

基　　金：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)

摘　　要：以典型黄土丘陵区山西省偏关县柠条林为研究对象,采用土柱法对平茬区与未平茬区柠条根系生长特点进行了对比研究。结果表明:平茬后经过4个月生长的林地内0～160cm土层、﹤10mm根系的根量大幅度增加,总根量达(5635.3±386.6)kg/hm2,平茬区比对照区增加了71.11%;特别是0～60cm土层范围内细根(﹤2mm)和粗根(2～10mm)的增加量较大,分别比对照区增加了93.29%和282.43%;在水平方向上,平茬区与对照区根系都在距丛较近范围内大量生长,平茬区在行间0.25m和株间0.5m处增加最多,分别比对照区增加了100%和133.84%。可见,平茬可大幅度提高柠条根系的生长,这也是平茬林地地上部分加速生长的重要原因之一。因此,有必要通过对衰老和成熟柠条林进行合理平茬以促进林分复壮和生长,提高林地生物产量,同时使林地提供更多更好的能源及饲料用材。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.

关 键 词：黄土高原 柠条 平茬 根系 

分 类 号：S793.3[农业科学—林木遗传育种]