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首页> 外文期刊>Indian Journal of Forestry >Forest floor biomass, litter fall and nutrient return through litters of high density poplar plantations in Tarai of central Himalaya
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Forest floor biomass, litter fall and nutrient return through litters of high density poplar plantations in Tarai of central Himalaya

机译：喜马拉雅山中部塔莱高密度杨树人工林凋落物的林地生物量，凋落物和养分归还

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This paper describes the litter dynamics and nutrient use efficiency of high density Poplar (Populus deltoides) plantations in 1 to 4 yrs-old stand growing in Tarai belt adjaccnt to the Central Himalayan mountain, India. Tree desity was 666 trees ha~(-1) in each plantation. In the forest floor biomass, the contribution of partially and more decomposed litter component was highest throughout the year. The total litter fall was 2.38-5.69 t ha~(-1) yr~(-1) and increased with increase in as of stand. Of which, leaf, wood and root litter accounted for 80.6-83.6, 3.2 and 16.2-16.6 percent, respectively. However, the annual replacement of forest floor litters mass range from 93 (4-yr) to 96 percent (1-yr) with a turnover time 1.04-1.07 year. The turnoverrate of nutrients (NPK) WAS 0.83 TO 0.92. It was decreased with increase in plantion age. The total amount of nutrient return to the soil through litter was 34-77 N, 4 - 9 P and 20 - 47 K kg ha~(-1) yr~(-1). It was increased with increase in plantationage because of higher litter accumulation. The nutrient use efficiency (NUE) ranged from 70 (1-yr) to 84 (4-yr) for N, 580 (1-yr) to 625 (4-yr) for P and 119 (3-yr) to 120 (4-yr) for K.
机译：本文描述了印度中部喜马拉雅山附近的塔莱带生长的1至4岁林分的高密度杨树（Populus deltoides）人工林的凋落物动态和养分利用效率。每个人工林的树木矮度为666公顷（-1）。在森林地表生物量中，部分和更多分解的凋落物成分的贡献全年最高。凋落物总量下降为2.38-5.69 t ha〜（-1）yr〜（-1），并随立地时间的增加而增加。其中，树叶，木材和根凋落物分别占80.6-83.6％，3.2％和16.2-16.6％。但是，林地垫料的年更换量从93（4年）到96％（1年），周转时间为1.04-1.07年。营养物质的周转率（NPK）为0.83至0.92。随着种植年龄的增长而降低。通过垫料返回土壤的养分总量为34-77 N，4-9 P和20-47 K kg ha〜（-1）yr〜（-1）。由于较高的凋落物积累，其随着人工林的增加而增加。氮素的养分利用效率（NUE）为70（1-yr）至84（4-yr），P的养分利用率为580（1-yr）至625（4-yr），119（3-yr）至120（3-yr）。 K（4年）。

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