Spatial Differences of Populus Simonii Carr. Growthin Loess Gully and Hilly Region--A Case Study in Wuqi County

WEN Zhong-ming; CONG Huai-jun; JIAO Feng; WANG Fei

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Spatial Differences of Populus Simonii Carr. Growthin Loess Gully and Hilly Region--A Case Study in Wuqi County

- Spatial Differences of Populus Simonii Carr. Growthin Loess Gully and Hilly Region--A Case Study in Wuqi County
- Bulletin of Soiland Water Conservation Vol. 24, Issue 1, Pages: 15-17(2005)
- 作者机构：
  
  中国科学院水利部水土保持研究所, 陕西杨凌,712100
- 作者简介：
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- Published：2005
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WEN Zhong-ming, CONG Huai-jun, JIAO Feng, et al. Spatial Differences of Populus Simonii Carr. Growthin Loess Gully and Hilly Region--A Case Study in Wuqi County[J]. Bulletin of Soiland Water Conservation, 2005, 24(1): 15-17.
DOI：

WEN Zhong-ming, CONG Huai-jun, JIAO Feng, et al. Spatial Differences of Populus Simonii Carr. Growthin Loess Gully and Hilly Region--A Case Study in Wuqi County[J]. Bulletin of Soiland Water Conservation, 2005, 24(1): 15-17. DOI：

摘要

小叶杨是黄土高原地区栽植较为广泛的树种之一。通过对不同坡位小叶杨纯林和小叶杨+沙棘混交林中的小叶杨的生长状况的研究

结果表明:坡下位的小叶杨生长良好

郁闭度为30%

树高可达12.67m

而坡中位和坡上位的小叶杨树高仅为5.70m和5.21m

相差1倍以上。地径、胸径、枝下高和冠幅生长状况表现出同样的趋势;以沟谷地带的小叶杨的生长位为基点

则坡下部、中部和上部的小叶杨的树高和胸径相对生长潜力分别为沟谷小叶杨的77.53%

34.88%

31.88%和75.59%

39.51%

33.36%;但小叶杨与沙棘混交后

生长表现较为良好;混交林的覆盖度最高、并且具有较高的物种多样性指数

物种较多且分布均匀

具有良好的生态效益。研究表明

小叶杨作为该地区的一个隐域树种

除沟谷等一些水分条件较好的立地外

不宜进行大面积栽植。

Abstract

Populus simonii Carr. is a species widely planted on the Loess Plateau. The results of the study show that the growth of P. simonii Carr. is constrained by spatial site conditions. Its growth reached the highest in gullies where soil water conditions was better than in other sites. On the same slope

the P. simonii Carr. grows better in lower part than in middle and upper parts. The height growth reached 12.67m in lower part while reached 5.70m and 5.21m respectively in middle and upper parts. The diameter at the base and chest height

the height of the lowest branch and the canopy growth showed the same trend. With the gully bottom as the reference site

the growth of P. simonii Carr. was evaluated. The height growth reached 77.53%

34.88% and 31.88% of the potential growth in lower

middle and upper parts respectively while the growth of the diameter at chest height reached 75.59%

39.51% and 33.36% of potential growth respectively. When mixed with Hippophae rhamnoides L.subsp.

the P. simonii Carr. showed better growth than planted in single species. The analysis of biodiversity showed that the mixed forest of P. simonii Carr. and Hippophae rhamnoides L.subsp.had the higher biodiversity values and more evenly distributed species

and had a higher ecological benefit. These results showed that P. simonii Carr. can be planted only in gullies where soil water conditions were better

and can not be planted in large scale

especially in middle and upper parts of the slopes.

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