查询词典 plantation

Analis presented in our 85 survey locations that were distributed in all counties on the Taiwan excluded the Taitung county, Hualien county, green island and orchid island. The altitude of P. analis habitats ranged from plain to the 400 m. The eleven types of habitats included bamboo plantation, windbreaks, orchard, dry riverbed, grassland, tea plantation, broadleaf forest, vegetable, paddy field, sugarcane field, and Arecae catechu showed the high diversity. The grassland was found in the highest ratio among 34 habitats and followed by the dry riverbed, which was found eleven sites.

经调查此虫在台湾分布情形，结果发现有栖地85处，台东县、花莲县、兰屿、绿岛除外，其余各县市皆有分布，从平原至海拔400公尺间；幼虫栖地类型有竹林、防风林、果园、河床、草地、茶园、阔叶树林、菜园、农田、蔗田及槟榔园等11型，显示其多样性高，其中草地型34处出现的频率最高，河床型13处次之。

At the age of eight he was sent to the plantation where his father was a manager, and one year later to the Auld household in Baltimore where he was taught to read. In 1833 Douglass was returned to the plantation, from which he attempted to escape, the delivered again to Auld, who apprenticed him as a ship caulker.

他八岁那年被送到他父亲的农场，一年后送到 Baltimore 的亲戚 Auld 家，在哪里开始学习阅读。1833年道格拉斯被送回农场，在那里试图逃跑，后来又被送到 Auld ， Auld 让他做了修补船只的学徒。

On mountainous sites, grade Ⅰ or Ⅱ stands including land below the crown of the secondary broadleaf forest and the Chinese-fir plantation or east-facing, shady dry land could be considered for the plantation. The transmittance of crown in the areas should be 55%~60%. One-year-old high quality seedlings above 25 cm tall and 0.25 cm in diameter near the ground-level should be used. For high-yield, field cultivation, shading facility should be considered and seedlings of taller than 15 cm and greater than 0.15 cm in diameter near the ground should be applied. The appropriate density and sunlight transmittance ought to be 30 cm×30 cm and 50%, respectively.

结果表明，利用山地种植，选择透光率为55%~60%的Ⅰ、Ⅱ类立地的残次阔叶林和杉木林冠下，或地形隐蔽、东向的山垅旱地，选用苗高25 cm以上、地径0.25 cm以上的1年生优质苗木造林；利用农田进行庇荫设施高产栽培，应选用苗高在15 cm以上、地径0.15 cm以上规格的苗木栽植，适宜栽植密度为30 cm×30 cm，遮阳透光率在50%左右。

In plantation ecosystem, the vegetation diversity decreased due to natural factor or human activity, but the level of diversity is not always lower than that of other ecosystems. Especially in region with rare vegetation, the level diversity of undergrowth vegetation in plantation is higher.

人工林林下植被多样性会因自然或人为因素而下降，但是林下植被多样性并不低于所有自然生态系统，在植被稀少、种源匮乏地区，人工林林下植被的生物多样性甚至高于自然生态系统。

The results showed that the concentration of dissolved organic carbon in leachate from fresh litter fall was lower and that from F layer was higher for both plantations. In Castanopsis plantation, DOC concentration declined with the increasing number of leaching times, whereas that in China fir plantation increased at first then decreased.

光谱特征。结果表明，格氏栲和杉木人工林新近凋落物淋出液的DOC浓度较低，F层淋出液的DOC浓度较高；格氏栲凋落物淋出液的DOC浓度基本上随淋溶次数的增加而降低，杉木的则先升后降。

Based on the informative cluster analysis on succession of the plantation, the plant community in tidal zone can be classified into 4 categories: the primary types of plantation in succession is dominated by Saltliving Wormwood ; the climax in which Lalang Grass is the dominant, the seral community in which Chinese Aeluropus is the dominant; and the marsh community where reed is prevail.

通过信息聚类分析方法对滩涂的植物群落进行研究表明：滩涂植物群落可分为四种类型：以盐蒿为代表的演替初级阶段类型；以白茅为代表的演替高级阶段类型；以獐毛为代表的演替过渡阶段类型；以及以芦苇为代表的沼生植物类型。

The results showed that in the four rehabilitated forests, the previous month's soil moisture content had stronger effects on the current month's soil moisture content in 0-40 cm and 20-40 cm layers, but had lesser effects on that in 0-10 cm layer. The soil moisture content in 20-40 cm layer was mainly affected by current month's precipitation, while that in 0-10 cm layer was mainly affected by current month's evaporation. The correlation coefficient between current month's precipitation and soil moisture content was the largest in pure Liquidambar formosana plantation, and the auto-interrelation coefficient of soil moisture content was larger in mixed forests than in pure L. formosana plantation.

结果表明：研究区各重建森林前一个月的土壤含水量对当月整个土壤剖面(0~40 cm)平均土壤含水量和当月20~40 cm土层土壤含水量具有较强影响，对当月0~10 cm土层土壤含水量的影响较小；研究区各重建森林20~40 cm土层土壤含水量主要受当月降水量的影响，0~10 cm土层土壤含水量主要受当月蒸发量的影响；在4种森林重建模式中，枫香纯林当月降水量与当月土壤含水量的相关系数最大，混交林模式土壤含水量的自相关系数大于纯林模式。

These changes include both positive changes from nonforest to forest and negative changes from forest to nonforest. The top ten changes by area were as follows: plantation to cut area, forest toopen forest, forestto cut area,non forest to forest, barren land to forest,plantation to plowland,forest tobarren land,plantation to barren land,nonforest landto forest and open forest to forest.

森林资源变化依次是经济林变成采伐迹地、林分转变为疏林地、林分转变为采伐迹地、非林地向林地转变、宜林地转变为林分、经济林转变为耕地、林分转变为宜林地、经济林转变为宜林地、未成林地转变为林分、疏林地转变为林分。

In order to assess the change of triploid populus tomentoza pulp plantation long-term-site productivity, The paper studied on effects of aboveground litterfall, fine root turnover and wet dust precipitation in nutrient cycling of triploid populus tomentoza pulp plantations at different ages,namely 2a、4a、5a、6a.It studied influence of different factors on decomposition of leaf、tree bark and twig of triploid populus tomentoza to select the operations to accelerate the decomposition and nutrient release. Finally, it studied influence of different intercrops on plantation site productivity and the relationship of intercrops and triploid populus tomentoza to select suitable intercrops. The main results as follows:(1)The aboveground litterfall of triploid populus tomentoza increased along with age from 216.03±59.7gm~(-2) at 3a to 482.38±101.3gm~(-2) at 7a, The N returned by litterfall wasl8.38±2.46kg.hm~(-2)a~-121.63±2.25kg.hm~(-2a~-139.51±4.61kg.hm~(-2a~-138.89±4.89kg.hm~(-2a~(-1) at 3a、5a、6a、7a respectively. The P returned by litterfall was 5.80±0.62kg.hm~(-2)a~(-1)、8.16±0.94kg.hm~(-2)a~(-1), 11.31±1.33kg.hm~(-2)a~(-1)、11.76±1.37kg.hm~(-2)a~(-1) at 3a、5a、6a、7a respectively. The nutrient returned by fine root turnover increased along with age, too. The N returned by fine root turnover was 3.85±0.41kghm~(-2)a~(-1)、5.22±0.63kghm~(-2)a~(-1),7.62±0.89kghm~(-2)a~(-1),9.17±1.22kghm~(-2)a~(-1) at 3a、5a、6a、7a respectively. The P returned by fine root turnover was 0.73±0.07kghm~(-2)a~(-1)、1.69±0.09kghm~(-2) a~(-1)、1.92±0.31kghm~(-2)a~(-1)、1.96±0.21kghm~(-2)a~(-1) at 3a、5a、6a、7a respectively. The leaf was the principal pathway to return nutrient to soil among litterfall, fine root turnover and wet dust precipitation. The proportion of returned N by leaf was 74.84%、71.96%、78.58%、75.03% at 3a、5a、6a、7a respectively,The proportion of returned P by leaf was 85.93%、80.31%、83.04%、83.23% at 3a、5a、6a、7a respectively. Therefore, it is important to protect and utilize the leaf in order to maintenance and enhance the long-term-site productivity of triploid populus tomentoza pulp plantation.

本文采取时序研究法，以3a、5a、6a、7a共4个不同年龄的三倍体毛白杨纸浆林为对象，研究了地上凋落物、细根周转、湿沉降在林分N、P营养元素循环中的作用及不同年龄林分N、P营养元素循环的特征，以评价三倍体毛白杨纸浆林长期立地生产力的变化；采取网袋法研究了不同因素对落叶、树皮、树枝分解的影响，以确定加快其分解、促进养分释放的措施：同时研究了不同间作物对林地影响、林木与间作物之间关系，以选择能维持立地生产力的合适的间作物种类等内容，得到以下结论：(1)随着年龄的增加，三倍体毛白杨地上凋落物的数量从3a的216.03±59.7gm~(-2)增加到7a的482.38±101.3gm~(-2)，通过凋落物归还的N分别为：3a时为18.38±2.46kg.hm~(-2)a~(-1)，5a时为21.63±2.25kg.hm~(-2)a~(-1)，6a时为39.51±4.61kg.hm~(-2)a~(-1)，7a时为38.89±4.89kg.hm~(-2)a~(-1)，归还的P分别为：3a时为5.80±0.62kg.hm~(-2)a~(-1)，5a时为8.16±0.94kg.hm~(-2)a~(-1)，6a时为11.31±1.33kg.hm~(-2)a~(-1)，7a时为11.76±1.37kg.hm~(-2)a~-1随着年龄的增加，通过细根周转归还的养分也在增加，归还的N分别为：3a时3.85±0.41kghm~(-2a~(-1)，5a时5.22±0.63kghm~(-2)a~(-1)，6a时7.62±0.89kghm~(-2)a~(-1)，7a时9.17±1.22kghm~(-2)a~-1归还的P分别为：3a时0.73±0.07kghm~(-2a~(-1)，5a时1.69±0.09kghm~(-2)a~(-1)，6a时1.92±0.31kghm~(-2)a~(-1)，7a时1.96±0.21kghm~(-2)a~-1从地上凋落物、细根周转、湿沉降三种不同途径归还林地养分所占的比例来看，地上凋落物中的落叶是归还养分主要途径，年龄在3a、5a、6a、7a时，通过落叶归还的N所占比例分别为74.84%、71.96%、78.58%和75.03%，归还的P所占比例分别为85.93%、80.31%、83.04%和83.23%。

The composition and dynamias of analysis and appraise of maturalized plantation indictedthat PNT has improved the diversity and stability of the plantation,and the plantation has beenchanged into the mixed and uneven-aged naturalized stands.

对定向抚育与一般抚育及开拓林隙与未开拓林隙措施的研究表明：定向抚育提高乔木物种多样性和群落的稳定性，说明这两种措施推动和加速了人工林向混交、异龄、复层、优质天然化林分的转化。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。