摘要
在陕北黄土丘陵沟壑区,对阳坡、半阳坡的不同林龄狼牙刺的生长特征作了系统研究,调查分析了狼牙刺的株高、冠幅、树龄、物种组成、新枝生长量以及地上部生物量和叶量(以柠条为研究对照)等生长特征指标。结果表明:天然灌木狼牙刺的株高在1.50m左右,冠幅约2.0m×2.0m,平均分枝数约4.45。17龄、14龄、6龄狼牙刺地上部生物量和种群密度分别为21.0t/hm2,10000株/hm2;27.3t/hm2,4375株/hm2;6.8t/hm2,8750株/hm2;6、7、8三个月份是狼牙刺新枝的快速生长期,新枝年生长量大小顺序为14龄狼牙刺>6龄狼牙刺>17龄狼牙刺。流域内,狼牙刺个体地径基本保持直线生长,其种群处于旺盛生长阶段。林龄是造成狼牙刺地上部生物量差异的主要内因,而立地条件(土壤水分状况)的优劣以及种群密度则是影响狼牙刺地上部生物量及生长速率的重要外部因素。与柠条相比,狼牙刺在长期的生长发育过程中与土壤水分环境形成了更为协调的关系,表现出较高的土壤水分含量和多年地上部累积生物量,生长旺期盖度均能达到50%以上,应该成为当地造林树种的优先选择之一。
Based on the investigation of above-ground biomass( Caragana korshinskii as a contranst), the number of species, height, diameter of branches et al. , made a systematical research on growth characteristics of Sophora viciifolia in the hilly and gully region of Loess Plateau in north of Shaanxi Province. The main conclusions can be drawn: the height of S.viciifolia 1.5 m; crown of a tree is 2.0 m×2.0 m;the average branches is 4.45; the above-ground biomass and populations density is 21.0 t/hm^2,10 000 plant/hm^2;27.3 t/hm^2, 4 375 plant/hm^2; 6.8 t/hm^2, 8 750 plant/hm^2 respectively; the new branch grows faster in June, July and August, the order of new branch's length in the whole year is 14'S.>6'S.>17'S.; The diameter of S.viciifolia ground-branch keeps linear growth with its age, the population is in the stage of blooming; the age of shrub is the main interal reason resulting the difference of the above-ground biomass, the soil water and population is the main extra reason resulting the difference of the above-ground biomass and growth velocity; Compared with the C.korshinskii , the S.viciifolia has the better relationship with the soil water and show the more above-ground biomass and soil water, moreover, its coverage of crow can surpass 50% usually, the author thinks the S.viciifolia should be one optimum choose of forestation trees.
出处
《西北植物学报》
CAS
CSCD
2004年第10期1792-1797,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
中国科学院知识创新项目(KZCX1-06)
国家重点基础研究发展规划项目(G2000018606)
国家"十五"科技攻关黄土课题(2001BA508B17)
关键词
黄土丘陵沟壑区
狼牙刺
种群
生长特征
hilly and gully region of Loess Plateau
Sophora viciifolia Hance
populations
growth characteristics
