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middle age forest
相关语句
  中龄林
     Biomass and carbon pool of Larix gmelini young and middle age forest in Xing′an Mountains Inner Mongolia
     兴安落叶松(Larix gmelini)幼中龄林的生物量与碳汇功能
短句来源
     The largest effective quantity of water storing of mnatural forest, middle age forest and young growth forest of natural forest reaches to 1 285.1 t/hm 2, 1 065.4 t/hm 2 and 798.5 t/hm 2 respectively;
     在天然林中 ,近成熟林和成熟林、中龄林、幼林分别为 12 85 .1,10 6 5 .4,798.5 t/ hm2 ;
短句来源
  “middle age forest”译为未确定词的双语例句
     A STUDY ON FORCASTING CONE CROP OF YOUNG AND MIDDLE AGE FOREST BY INFORMATION SECTION OF FLOWERING AND FRUITING FOR CHINESES FIR
     利用开花结实信息段预测中、幼龄杉木球果产量的研究
短句来源
  相似匹配句对
     MIDDLE AGE
     中年风韵
短句来源
     It is middle Pleistocene in age.
     年代地层单位属中更新统。
短句来源
     In the Middle
     人在中途
短句来源
     The Age of Game
     游戏的时代
短句来源
     The age of 126 ?
     二道沟矿区成矿前或成矿期闪长玢岩脉的年龄126±1Ma限定了该区金矿化的最大年龄;
短句来源
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In accordance with the data of annual volume increments of 99 trees, 220 year-old Korean pine, the age groups of natural Korean pine forests are studied and analysed by the method of category assembling. The results are as follows: young forests, 1—80 years;middle age forests, 81—140 years; near mature forests, 141—160 years; mature forests, 161—200 years;over mature forests, over 201 years.Through variance analysis and multi-layered comparison, it shows that the differences...

In accordance with the data of annual volume increments of 99 trees, 220 year-old Korean pine, the age groups of natural Korean pine forests are studied and analysed by the method of category assembling. The results are as follows: young forests, 1—80 years;middle age forests, 81—140 years; near mature forests, 141—160 years; mature forests, 161—200 years;over mature forests, over 201 years.Through variance analysis and multi-layered comparison, it shows that the differences of annual volume increments among the age groups are significant, and it is demonstrated that the abormentioned standard is scientific and reasonable. Perhaps this standard is better than that in the"some technical rules of investigating forest resources" issued by the Ministry of Forestry of China in 1982.

本文收集99株220年生红松的材积连年生长量材料,采用聚类分析方法,对我国天然红松林合理划分龄组问题进行了探讨。研究结果是:幼龄林1—80年,中龄林81—140年,近熟林141—160年,成熟林161—200年,过熟林201年以上。方差分析和多重比较的结果表明,相邻龄组间林木连年生长量差异显著,又与中华人民共和国林业部1982年颁发的《森林资源调查主要技术规定》中天然红松林龄组划分标准相比较,均证明本文划分标准比较科学合理。

A investigation on harm of gnawing animals to the forest shows as follows.The degree of harm to the northern forest is more serious than to the southern forest, to timber forest than to economic forest, to young age forest than to middle age forest. The rate of gnawing harm of timber forest is between 3.98%~8.92%,death rate 4.10%~8.62%,those of economic forest are 2.74%~4.38%and 0.45%~1.11% respectively,the gnawing rate of young age 5.05%~14.62%,death rate 15.58%~26.70%,those of middle...

A investigation on harm of gnawing animals to the forest shows as follows.The degree of harm to the northern forest is more serious than to the southern forest, to timber forest than to economic forest, to young age forest than to middle age forest. The rate of gnawing harm of timber forest is between 3.98%~8.92%,death rate 4.10%~8.62%,those of economic forest are 2.74%~4.38%and 0.45%~1.11% respectively,the gnawing rate of young age 5.05%~14.62%,death rate 15.58%~26.70%,those of middle age forest are 2.02%~4.25% and 0~0.64% respectively.

调查发现,延安地区啮齿动物对林区的危害度,北部比南部大,用材林比经济林大,幼龄林比中龄林大;用材林啃伤率为3.98%~8.92%,死亡率为4.10%~8.62%;经济林啃伤率为2.74%~4.38%,死亡率为0.45%~1.11%;幼龄林啃伤率在5.05%~14.62%,死亡率为15.58%~26.70%;中成龄林啃伤率为2.02%~4.25%,死亡率为0~0.64%。

The carbon cycle ,especially the CO 2 emission and uptake by the middle age and near mature Abies fabri forests was studied in this paper .The forest CO 2 source and sink were emphatically analyzed .Based on the data of located observation on the east slope of Gongga Mountain, the following aspects were investigated in the middle age and near mature Abies fabri forests: the storage of plants carbon , soils organic carbon , litter and dead standing tree carbon, photosynthetic rates of the plants and...

The carbon cycle ,especially the CO 2 emission and uptake by the middle age and near mature Abies fabri forests was studied in this paper .The forest CO 2 source and sink were emphatically analyzed .Based on the data of located observation on the east slope of Gongga Mountain, the following aspects were investigated in the middle age and near mature Abies fabri forests: the storage of plants carbon , soils organic carbon , litter and dead standing tree carbon, photosynthetic rates of the plants and respiration rates of the plants and soils by CI-301 photosynthesis system. The results show that the total carbon storage of the near mature forest was 320.966 t/hm 2,of which , the storage of plant carbon ,soil organic carbon, litter and dead standing tree carbon accounted for 172.740, 143.152, 1.786 and 3.288 t/hm 2, respectively. The total carbon storage of middle age forest was 98.465 t/hm 2, of which ,the storage of plant carbon, soil organic carbon, litter and dead standing tree carbon accounted for 57.966, 30.698, 1.504 and 8.297 t/hm 2, respectively. CO 2 was released which a rate of 21.749 t/hm 2· a from the soil of the near mature forest. CO 2 was released with a rate of 12.320 t/hm 2· a from the soil of the middle age forest. The results also show that there was an increasing in carbon storage of the middle age and near mature forests from atmospheric CO 2.The main factor which affected soil respiration was temperature.Finally ,the uncertainties in the estimations were discussed in detail and further works were also suggested.

根据定位观测数据和有关历史资料,研究了贡嘎山东坡峨眉冷杉(Abiesfabri)近熟林和中龄林C循环。测定了两种林分植物C储量、土壤有机C储量、凋落物和立枯量中的C储量,并对两种林分的净光合速率进行了对照研究。

 
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