陕北半干旱黄土区林分混交模式对沙棘生长的影响  

Influence of Stand Mixed Pattern on Growth of Hippophae rhamniodes L.subsp.sinensis in Semi-Arid Region of Loess Plateau in North Shaanxi,China

作　　者：郑学良[1] 朱清科[1] 赵彦敏[1] 王露露[1] 马欢[1] 刘蕾蕾[1] 

机构地区：[1]水土保持与荒漠化防治教育部重点实验室(北京林业大学),北京10083

出　　处：《东北林业大学学报》2013年第6期1-4,18,共5页Journal of Northeast Forestry University

基　　金：国家"十二五"科技支撑计划项目(2011BAD38B06)

摘　　要：通过调查陕北半干旱黄土区不同立地类型下不同混交林中沙棘的各项生长指标,研究不同混交模式对沙棘生长的影响,以期为该地区沙棘人工林的稳定性评价和改良提供依据。结果表明:(1)在阴坡沙棘混交林的林分结构比纯林好,尤其是刺槐沙棘混交林和山杏沙棘混交林,而阳坡沙棘纯林的林分结构较合理;阴坡和阳坡枯立木密度与林分总密度相关性都较强,均随着林分密度的增大而增大。(2)阴坡沙棘新梢生长量的大小顺序为:山杏沙棘混交林、刺槐沙棘混交林、沙棘纯林、油松沙棘混交林,阳坡为油松沙棘混交林最高、沙棘纯林最低;沙棘林的累积生物量在阴坡和阳坡分别以山杏沙棘混交林和刺槐沙棘混交林最大,都以油松沙棘混交林最小,与当年新梢生长量相关性系数分别为0.898、0.585。(3)沙棘林分更新阴坡以沙棘纯林和刺槐沙棘混交林较好,阳坡以刺槐沙棘混交林和山杏沙棘混交林较好,与沙棘林分结构和生长状况的规律不一致。以上研究结果表明:无论在阴坡还是阳坡,沙棘与刺槐混交均有利于沙棘的生长,且更新能力较强,可以做为沙棘纯林的改造目标,促进沙棘群落持续稳定发育。An investigation was conducted to study the effects of different mixed model on the growth of Hippophae rhamniodes L. subsp, sinersis in semi-arid region of Loess Plateau in North Shaanxi, China. Various indexes influencing the growth of H. rhamnoides L. subsp, sinersis were investigated in different models of mixed forests in different site types for evaluating and improving the stability of H. rhamnoides L. subsp, sinensis plantation. In shady slope, the stand structure of mixed H. rhamnoides L. subsp, sinensis is better than that of pure forest, and pure H. rhamnoides L. subsp, sinensis forest structure is more reasonable in sunny slope. The growth increment order of H. rhamnoides L. subsp, sinensis shoots is Prunus armniacal＋H, rhamnoides L. subsp, sinensis, Robinia pseudoacacia L＋H. rhamnoides L. subsp, sinensis, pure 11. rhamnoides L. subsp, sinensis and Pinus tabulaeformis＋H, rhamnoides L. subsp, sinensis. In sunny, Pinus tabulaefor- mis＋H, rhamnoides L. subsp is the highest mixed forest and pure H. rhamnoides L. subsp, sinensis is lowest. The accu- mulative dry matter of Prunus armniacal H. rhamnoides L. subsp, sinensis mixed forest and R. pseudoacacia L H. rham- noides L. subsp, sinensis mixed forest is largest and that in Pinus tabulaeformis H. rhamnoides L. subsp, sinensis mixed forest is least in both shady slope and sunny slope with the correlation coefficient for shoots growth of O. 898 and 0. 585, respectively. Pure H. rhamnoides L. subsp, sinensis and Robinia pseudoacacia L＋H. rhamnoides L. subsp, sinensis forest in shady slope and R. pseudoacacia L＋H. rhamnoides L. subsp, sinensis and P. armniacal H, rhamnoides L. subsp, sinen- sis mixed forest in sunny slope are fit for regeneration, and the results are inconsistent to H. rhamnoides L. subsp, sinensis forest stands structure and growth status. Therefore, both in shady slope or the sunny, R. pseudoacacia L. is favorable for the growth of H. rhamnoiJes L. subsp, sinensis with higher regeneration ability. It can be used as the target of

关 键 词：沙棘 林分结构 新梢生长量 更新能力 林分改造 

分 类 号：Q725.2[生物学—分子生物学]