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middle forest
相关语句
  中林
     In the sample used, L. does well, the middle forest is that the number behaves worse;
     在所用的样品当中,L系表现较好,中林系号表现较差;
短句来源
  “middle forest”译为未确定词的双语例句
     Studies on Comprehensive Pattern of Tianshan Picea Stand Volume in the Middle Forest District of the Tianshan Mountains
     天山中部天山云杉林蓄积量综合模式的研究
短句来源
     The mean fresh biomass of the community is 147. 20g/m~2,being comprised of 76.14g/m~2 in landward forest region,164.69g/m~2 in middle forest region and 200.76g/m~2 in seaward forest region,respectively.
     群落平均鲜重生物量147.20g/m~2。 靠陆林区76.14g/m~2,中部林区164.69g/m~2,靠海林区200.76g/m~2。
短句来源
     /m~2 in middle forest region and 402No.
     /m~2,靠海林区402No.
短句来源
     A Microclimatic Observation on Picea shrenkiana Var. tianshanica Gorest in Middle Forest Zone of Northern Slope of Tianshan Mourtain
     天山北坡中部林区天山云杉林小气候观测
短句来源
     Ignition character of thickness above 0.7 and middle forest were the worst. (3)Oak and broad leaved forest in the east of Changbai mountain were the highest ignition frequency;
     疏密度在0.7以上和中壮龄林的着火性最差.③东部长白山地区以柞林和阔叶林的着火频率最高;
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  相似匹配句对
     forest .
     林。
短句来源
     In the Middle
     人在中途
短句来源
     Influence of forest on snowflow in the middle region of Heilongjiang Province
     黑龙江省中部地区森林对融雪径流的影响
短句来源
     On Establishing the Forest Park in the Middle Section of the Taihang Mountains
     创建太行山中段森林公园刍议
短句来源
     MIDDLE WAIST
     中腰风采
短句来源
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Pine root-collar bark weevil (Hylobitelus sp. ) is widespread in Yunnan province. The larvae mainly infest young and middle forests of Pinus yunnanensis, P. kesiya and P. armandi by boring the embium and the phloem at root-collar of the trees.The slight injury makes the needles turn to yellow and brown, and the serious makes trees grow slow and even die. Hylobitelus sp. requires 2 years to complete 1 generation,and the adults and larvae of 5- 7 instars live through winter.The emergence begins in the middle...

Pine root-collar bark weevil (Hylobitelus sp. ) is widespread in Yunnan province. The larvae mainly infest young and middle forests of Pinus yunnanensis, P. kesiya and P. armandi by boring the embium and the phloem at root-collar of the trees.The slight injury makes the needles turn to yellow and brown, and the serious makes trees grow slow and even die. Hylobitelus sp. requires 2 years to complete 1 generation,and the adults and larvae of 5- 7 instars live through winter.The emergence begins in the middle of August, and the adults, through winter twice, live two years. The mating actions occur in all the adult period, but the adults do not lay eggs in this year themselves emerged. Larval stage continues for 10-14 months, most larvae are 7-8 instars. The pupation begins in late Junly, and the popal stage is about 27 days. Because the population density of this weevil is quite low, and the period in which the matural lavae,through pupating and emerging, become adults lasts,more than two months, and their instars are quite regular, they can be easily destroyed by hand during the period from late August to, the middle of September.

松根颈树皮象广泛分布在云南省,幼虫主要为害云南松、思茅松和华山松中幼林。幼虫钻蛀松树根颈的形成层和韧皮部,当松树受害轻时针叶变为黄褐色,受害严重时致死。松根颈树皮象二年完成一代,以成虫和5—7龄幼虫越冬。成虫在8月中开始羽化,两次越冬并生活达2年。整个成虫期都有交尾活动,但在羽化的当年不产卵。幼虫期10—14个月,主要为7—8龄,7月下旬开始化蛹,蛹期约27天。由于虫口密度较低,老熟幼虫做蛹室至成虫羽化要经过两个多月,虫期整齐,很容易用手清除。从8月下旬到9月中是最好的防治时期。

Sanjiang Plain is the famous marsh alluvial low plain in China, which is rich in natural resources and big agriculture production base in Heilongjiang province. It has an important significance to study the reasonable percentage of forest cover for determining reasonable proportion of forestland in Sanjiang Plain, resuming forest ecosystem swiftly and surmouting the natural disaster.The article analysed the relation between forest cover percentage and the rain, evaporation, temperature, wind and took further...

Sanjiang Plain is the famous marsh alluvial low plain in China, which is rich in natural resources and big agriculture production base in Heilongjiang province. It has an important significance to study the reasonable percentage of forest cover for determining reasonable proportion of forestland in Sanjiang Plain, resuming forest ecosystem swiftly and surmouting the natural disaster.The article analysed the relation between forest cover percentage and the rain, evaporation, temperature, wind and took further analysing about the relation between the forest cover percentage and the nautral disaster.In the view of the above points, we put forward the following points:1. The forest cover percentage of plain district is 15—25%.2. The forest cover percentage of semi-mountain district is 26—50%.3. The forest cover percentage of mountain district is more than 50%.4. The average cover percentage in Sanjiang plain is 36—40%.To resume the forest in Sanjiang plain, we must carry out the 《Forest Law))conscientiously, speed up afforestting step for barren hills and wasteland, adhere reasonable cut, enhance attending young and middle forest, make comprehensive utilization energitically and diversified economy, widen policy of forest and speed up reform of forestry.

三江平原是我国著名的沼译化冲积低平原,自然资源十分丰富,是黑龙江省重要的大农业生产基地。研究三江平原合理的森林覆被率,对合理的确定森林在三江平原占地比例,迅速恢复三江平原的森林生态系,克服自然灾害有着重要的意义。 本文从森林的作用这个方面,分析森林覆被率与降雨、蒸发量、气温、风的关系,并进一步分析森林覆被率与自然灾害的关系。提出: 平原区的森林覆被率为15%~25%; 半山区的森林覆被率为26%~50%; 山区的森林覆被率为50%以上。 三江平原平均森林覆被率为36%~40%。 为恢复三江平原森林,必须认真贯彻执行《森林法》,加速绿化荒山荒地的步伐,坚持合理采伐,加强幼中龄的抚育,大搞综合利用和多种经营,放宽林业政策,加快林业改革。

The paper suggested a new thinning method in young and middle forest. Firs the numbers of conserved trees should be divides with quantitative thinning method. Then the quality of conserved trees were divides with qualitative thinning method. The state of stands thinned could be estimated with the new method.

该文建议用一个新的间伐方法,首先用定量间伐法确定保留木数量,再用定性间伐法,确定保留木质量,该方法可以预估间伐后林分状况。

 
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