摘要
国家级公益林是怒江下游干热河谷保持生态安全的重要屏障,本文着重研究了该区域思茅松人工促进林随海拔变化的蓄积量变化情况,研究表明:怒江下游龙陵三江口国有林场生态公益林蓄积量显著受到海拔的影响(p<0.05)。从低海拔到高海拔区域,森林蓄积量呈先上升后下降的单峰型变化。在各海拔区间之中,森林平均蓄积量最低值为海拔900~1000 m,为132.9 m^3/ha,随着海拔的提升,平均蓄积量不断增大,最高值出现在海拔1400 m左右,蓄积量达到230.3 m^3/ha,随后,蓄积量开始下降,至海拔最高点海拔1880 m,平均蓄积量降至167.3 m^3/ha。随着海拔提升,900m至1400m之间,该生态公益林的蓄积量平均增长速率为19.5 m^3/(ha·100m),而自海拔1400 m至1880m之间,蓄积量的平均下降速度为12.6m^3/(ha·100m)。
National ecological forest io the ecological safe shelter of downstream of Nujiang dry-hot valley. An experiment was conducted aiming to the variation of Pinus kesiya forest volume along the elevational gradients, and result showed： the forest volume of national ecological forest in Sanjingkou National State-owned Forest Farm was significantly influenced by elevational gradients（p〈0.05） in downstream of Nujiang River Valley, Yunnnan Province. Forest volume showed a hump-shaped curve along the elevational gradients and peaked around 1400 m above mean sea level（AMSL）, corresponding to 230.3 m^3/ha; its minimum mean value was found in 900~1000 m AMSL, which was 132.9 m^3/ha, and it was also decreased when the elevation reached the highest point（1880 m AMSL） in the forest farm, the mean value dropped to167.3 m^3/ha. The average rate of increase was 19.5 m^3/（ha·100m） in 900~1400 m AMSL and the average rate of decrease was 12.6 m^3/（ha·100m） in 1400~1880 m AMSL.
出处
《林业建设》
2017年第3期56-60,共5页
Forestry Construction
关键词
思茅松林
森林蓄积量
海拔梯度变化
怒江河谷
Pinus kesiya forest
stem volume
elevational gradient
Nujiang River Valley
