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林木水分生产力
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  “林木水分生产力”译为未确定词的双语例句
     In order to find out the water productivity of some artifical plantations in removal land from cultivation for afforestation in the cold region of Loess Plateau of east Qinghai,commuinty evapotranspiration,sample area biomass and moisture potential productivity were investigated and analyzed in Datong county in Qinghai province from 2001 to 2003,and water productivity of 11 types of artificial plantions in the removal land were studied and.
     为了解青海东部黄土高原寒区退耕还林地人工林的水分生产力水平,2001—2003年对青海省大通县退耕还林的人工林进行了群落蒸散测算、标准地生物量调查和解析木分析,并研究了青杨灌木混交林、白桦紫果云杉混交林、华北落叶松纯林、紫果云杉纯林、白桦纯林等11种林分类型退耕还林人工林的林木水分生产力
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  相似匹配句对
     The soil moisture circumstance of woodland and woodland soil's water availability and productivity.
     ◆ 林木的土壤水分环境条件及土壤水分生产力特征分级
短句来源
     (3) Vegetation capacity of the soil water of the Plateau;
     (3)黄土高原水分的植被生产力
短句来源
     Grade classifications of soil water productivity and the effective dynamic evaluation of soil water upon forest production;
     ·土壤水分生产力分级及土壤水分林木生产有效性动态评价
短句来源
     STUDY ON THE WATER PRODUCTIVITY OF THE STANDS AFFORESTED BY WATER-HARVESTING
     集水造林林分水分生产力研究
短句来源
     Tree productivity and water production potential in Returning Farmland to Forest Project in Datong County, Qinghai Province
     青海大通退耕还林工程区林木生产力水分生产潜力研究
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To seek for the optimum thinning intensity for existing artificial black locust( Robinia pseudoacacia) forest improvement, 9 year old locust forest with density of 2 220 trees·hm -2 was experimented by three different thinning intensities in autumn of 1995. After thinning, the community density and the interception rate of canopy are both decreased, so that the water amount harvesting in the planting strip is increased and the soil moisture in available zone of root system is improved. The soil...

To seek for the optimum thinning intensity for existing artificial black locust( Robinia pseudoacacia) forest improvement, 9 year old locust forest with density of 2 220 trees·hm -2 was experimented by three different thinning intensities in autumn of 1995. After thinning, the community density and the interception rate of canopy are both decreased, so that the water amount harvesting in the planting strip is increased and the soil moisture in available zone of root system is improved. The soil moisture in thinning forest with density of 1 110 trees·hm -2 is increased by 40%,comparing with the non thinning forest in whole growing seasons. With the increase of thinning intensity, the function curve of tree's water productivity changes from linear to logarithmic upward. When the remaining density is 1 110 trees·hm -2 , the relation curve of tree's water productivity to transpiration is parabolic, which shows that at this moment water is not a limiting factor of production in the thinning forest any longer, and the values of water productivity (WP) of individual tree and whole forest are respectively 6 0171g·kg -1 ·mm -1 and 14 977 7kg·hm -2 ·mm -1 with this density, namely, the thinning intensity with remaining density of 1 110 trees·hm -2 is optimum in black locust forest in this region.

为了确定黄土高原地区现有刺槐林改造的最佳间伐强度,1995年秋季对密度为2220株/公顷的9年生刺槐林进行了三种不同强度的间伐.通过间伐,降低了群落密度,减少了林冠截留率,增加了植树带内的汇流量,根系层内的土壤水分条件得到明显的改善.当间伐后的林分密度为1110株/公顷时,生长季内植树带土壤水分提高约40%.随着间伐强度的增大,林木的水分生产函数曲线由直线上升变为以对数曲线上升;当间伐强度达到某一值时(保留密度为1110株/公顷),林木水分生产力随蒸腾量的变化曲线为抛物线.这表明此时水分已不再是林木生产的限制因子,在这种间伐强度条件下,单株林木和整个林分的水分生产力分别达到60171g·kg-1·mm-1和149777kg·hm-2·mm-1,因此将这一强度定为黄土高原地区刺槐林间伐的最佳强度.

Afforestation by water-harvesting improves the soil water environment in forest owing to increase of runoff volume collected in the planting strip, so that the productivity of forests is influenced. According to the model of \!the double best\" and the relationship (the water productivity- WP ) between the present situation of water environment improved and the forest production in the different model of afforestation by water-harvesting (forest density), the rational density of afforestation by water-harvesting...

Afforestation by water-harvesting improves the soil water environment in forest owing to increase of runoff volume collected in the planting strip, so that the productivity of forests is influenced. According to the model of \!the double best\" and the relationship (the water productivity- WP ) between the present situation of water environment improved and the forest production in the different model of afforestation by water-harvesting (forest density), the rational density of afforestation by water-harvesting has been chosen. With the decrease of forest density, the water amount harvested in the planting strip is increased and the soil moisture in available zone of root system is improved, so that the function curve of tree's water productivity changes from linear to logarithmic upward. When the forest density are respectively 1,000 per hm\+2 (in 5 years old ) and 840 per hm\+2 (in 10 years old), the relation curve of tree's WP(WP\-t) to transpiration is parabolic, which shows that at this moment water is not a limiting factor of production. Namely, the suitable density values of 5 years old and 10 years old black locust forest are respectively 1,000 per hm\+2 and 840 per hm\+2. Under the suitable density, the WP values of individual tree are respectively 6.7144 g\5kg\+\{-1\} and 12.1632 g\5kg\+\{-1\}, which accord with the standards of \!the designed individual pattern with high-yield\" model, and the WP values of forest are respectively 8.4103 kg\5hm\+\{-2\}\5mm\+\{-1\} and 21.6646 kg\5hm\+\{-2\}\5mm\+\{-1\}, which can be considered as \!the optimum population structure\" model. It can be applied in both theory and practice to choose the model of forest based on the relationship between water and forest production in the developing of water-saving forestry and in the improvment of water use efficiency.

集水造林通过增加植树带汇流量改善了林地土壤水分环境 ,从而影响到林分物质生产水平。根据不同集水造林密度对林地土壤水分环境的改善程度与林分物质生产之间的关系 (水分生产力 ) ,以“双优”模式标准 ,可以确定出合理的集水造林密度。供试的 5年生和 1 0年生刺槐林 ,分别以小于 1 0 0 0株·hm-2 和不大于 840株·hm-2 为合理的集水造林密度 ,其林木水分生产力分别达到 6 71 4 4g·kg-1和 1 2 1 6 32g·kg-1,符合“丰产理想株型”模式标准 ;林分水分生产力分别达到 8 4 1 0 3kg·hm-2 ·mm-1和 2 1 6 6 46kg·hm-2 ·mm-1,实现了“最佳群体结构”模式标准。在发展“节水”型林业、提高水分利用效率中 ,这种以水分与林分物质生产的关系为理论依据 ,确定造林密度 ,在理论和实践上是可取的

In order to find out the water productivity of some artifical plantations in removal land from cultivation for afforestation in the cold region of Loess Plateau of east Qinghai,commuinty evapotranspiration,sample area biomass and moisture potential productivity were investigated and analyzed in Datong county in Qinghai province from 2001 to 2003,and water productivity of 11 types of artificial plantions in the removal land were studied and.The results show that,3?000 trees per hm~2 is a proper standard of plantions...

In order to find out the water productivity of some artifical plantations in removal land from cultivation for afforestation in the cold region of Loess Plateau of east Qinghai,commuinty evapotranspiration,sample area biomass and moisture potential productivity were investigated and analyzed in Datong county in Qinghai province from 2001 to 2003,and water productivity of 11 types of artificial plantions in the removal land were studied and.The results show that,3?000 trees per hm~2 is a proper standard of plantions density for this region;Under current technological and economic condition,the productive efficiency of green poplar and shrub mixed forest,Asia white birch pure forest,China spruce pure forest,and Asia white birch and China spruce mixed forest with the density of 2?103?333 trees per hm~2,which is the top of all,can serve as potential productivity standard of actual productivity of mature arbor forest;The potential productivity of green poplar and shrub mixed forest,Asia white birch and China spruce mixed forest,China spruce pure forest and Asia white birch pure forest with the density of 3 000 trees per hm~2 have attained or been closed to local maximum tree productivity at present.These types of forestation models are the developing orientation of the removal land from cultivation for afforestation project and forestry ecological project.

为了解青海东部黄土高原寒区退耕还林地人工林的水分生产力水平,2001—2003年对青海省大通县退耕还林的人工林进行了群落蒸散测算、标准地生物量调查和解析木分析,并研究了青杨灌木混交林、白桦紫果云杉混交林、华北落叶松纯林、紫果云杉纯林、白桦纯林等11种林分类型退耕还林人工林的林木水分生产力。结果表明:1)3 000株/hm2左右密度的林分是该区较为适宜的造林密度标准;2)在目前的技术经济水平条件下,2 100~3 333株/hm2密度的青杨灌木混交林成林、白桦纯林、紫果云杉纯林和白桦紫果云杉混交林水分生产效率居所有林分之首,其水分生产力指标可作为该地区常规造林技术条件下乔木成林的水分生产力标准;3)3 000株/hm2左右密度的青杨灌木混交林、白桦紫果云杉混交林、紫果云杉纯林和白桦纯林成林的水分生产潜力基本达到了目前当地林木的最大生产能力。表明上述林分类型的造林模式可作为今后退耕还林工程和林业生态工程建设的发展方向。

 
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