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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)。
The state-level public welfare forest is an important barrier to maintain ecological security in the dry-hot valley in the lower reaches of the Nujiang River. This paper focuses on the changes of stock volume of the artificial forest promoted by the Pinus kesiya var. Angustifolia plantation along the altitude. The results show that: Forest volume was significantly affected by altitude (p <0.05). From low altitude to high altitude, the forest volume increased first and then decreased and then changed to a single peak. Among the elevations, the lowest value of average forest volume was 900-1000 m above sea level, which was 132.9 m 3 / ha. With the elevation increasing, the average stock volume increased continuously and the highest value appeared at about 1400 m above sea level, The accumulated volume reached 230.3 m 3 / ha. Afterwards, the stock volume began to decline, reaching an altitude of 1880 m at the highest point of elevation and the average volume was reduced to 167.3 m 3 / ha. With the elevation increasing from 900m to 1400m, the average growth rate of the ecological forest was 19.5 m 3 / (ha · 100 m). From 1400 m to 1880 m, the average decline rate of the stock volume was 12.6 m 3 / (ha · 100 m).