利用角尺度和大小比数结构参数,对陕西省榆林市珍稀沙生植物保护基地内不同梯度密度下的樟子松人工林林分空间结构进行了分析。结果表明:1) 从角尺度取值来看,各样地林木个体分布以均匀分布为主,且核心区林木数量随林分密度的增加而减少;2) 以分枝角为度量的大小比数反映各样地林木的大小分化程度,可信度较高。因此,通过分枝角的评价指标来评估樟子松单木的竞争优势及造林后防风固沙效果是可行的。研究结果可为探索毛乌素沙地樟子松建群种的植物固沙模式选择及管护治理工作提供理论支撑。
In our research,uniform angle index and neighborhood comparison were applied to different densities of Mongolian pine plantation to analyze their stand structure characteristics.The results showed that (1) Evenness distribution was the main spatial characteristics for the most of stands,and number of trees in the core area decreases with the density increasing.(2) The neighborhood comparison measured by branch angle was a visibly higher,thus,it is possible to evaluate the ranch angle index to achieve its predominance status among individuals competition and to enhance its effect on desertification.The conclusions of this study can provide important support for afforestation and forest management in this region.
[1] 康宏樟,朱教君,李智辉,等.沙地樟子松天然分布与引种栽培[J].生态学杂志,2004,23(5):134-139.
[2] 阴三军,高光芹,石艳芳,等.宝天曼天然林空间格局分析[J].西北林学院学报,2011,26(4):80-84.
[3] 闫东锋,何静,郭芳,等.宝天曼栎类天然次生林乔木层种间联结性研究[J].西北林学院学报,2009,24(1):26-30.
[4] 李明辉,何风华,刘云,等.林分空间格局的研究方法[J].生态科学,2003,22(1):43-50.
[5] 惠刚盈,Gadow K V,胡艳波,等.林木分布格局类型的角尺度均值分析方法[J].生态学报,2004,24(6):1225-1229.
[6] 郝月兰,张会儒,唐守正.基于空间结构优化的采伐木确定[J].西北林学院学报,2012,27(5):163-168.
[7] 曾德慧,姜凤岐,范志平,等.樟子松人工固沙林稳定性的研究[J].应用生态学报,1996,7(4):337-343.
[8] 惠刚盈,胡艳波.混交树种空间隔离程度表达方式的研究[J].林业科学研究,2001,14(1):177-181.
[9] 惠刚盈,Gadow K V,Albert M.角尺度—一个描述林木个体分布格局的结构参数[J].林业科学,1999,35(1):37-42.
[10] 惠刚盈,Gadow K V,Albert M.一个新的林分空间结构参数—大小比数[J].林业科学研究,1999,12(1):1-6.
[11] 郝云庆,王金锡,王启和,等.柳杉人工林林分不同变量大小比数研究[J].应用生态学报,2006,17(4):751-754.
[12] Sullivan T P,Sullivan D S,Lindgren P M,et al.Long-term responses of ecosystem components to stand thinning in young lodgepole pine forest:Ⅳ.relative habitat use by mammalian herbivores [J].Forest Ecology and Management,2007,240(1):32-41.
[13] Otoda T,Zhang Guosheng,Wang Linhe,et al.Effects of different planting methods on the early establishment of two introduced tree species in the mu us sandy land of China [J].lanscape and Ecological Engineering,2013,9(1):59-66.
[14] Zhao Q,Zeng D H,Lee D K,et al.Effects of Pinus sylvestris var.mongolica afforestation on soil phosphorus status of the Keerqin Sandy Lands in China [J].Journal of Arid Enviroments,2007,69(4):569-582.
[15] 孟祥楠,赵雨森,郑磊,等.嫩江沙地不同年龄樟子松人工林种群结构与林下物种多样性动态[J].应用生态学报,2012,23(9):2333-2334.
[16] 吕荣,刘朝霞,李维向.毛乌素沙地固沙造林针叶林树种选择的研究[J].中国沙漠,1998,18(1):81-86.
[17] 韩照日格图,白静,田有亮.大青山区油松人工林密度对林木生长影响的研究[J].内蒙古农业大学学报,2007,28(4):67-70.
[18] 王树森,余新晓,罗于洋,等.人工造林对八达岭森林植被木本植物生物多样性的影响[J].北京林业大学学报,2008,20(2):155-159.
[19] 赵文智,刘志民,常学礼.降水量下限引种区沙地樟子松幼林种群树高分布偏斜度和不整齐性[J].应用生态学报.2002,13(1):6-13.
[20] 周宏,东昌山,杨玉林,等.樟子松人工林抚育间伐初始期及强度的探讨[J].西北林学院学报,2011,26(1):187-189.
[21] Zhu Jiaojun,Fan Zhiping,Zeng Dehui,et al.Comparison of stand structure and growth between artificial and natural forests of Pinus sylvestiris var.mongolica on sandy land [J].Journal of Forestry Research,2003,14(2):103-111.
