查询词典 shrub

The results are showed as follows:the appearance of Luota karst forest community is characterized by the middle and lowphaneropytes such as Cyclobalanopsis glauca, Lithocarpus glaber, et al. The structure ofthe community is generally composed of tree layer, shrub layer and herb layer. Thedominants are Cyclobalanopsis glauca, Lithocarpus glaber, Dendrobenthamia capitata, et al.There are 36 tree, shrub and vine species in this community. The individnal height isincreased as pyramid, the volume has the same results.

结果表明：喀斯特森林木本植物群落的外貌由青冈栎、石栎、头状四照花、五裂槭等中、小高位芽植物决定，其结构一般分为乔木层、灌木层和草本层，上风种有青冈栎、石栎、头状四照花和五裂槭；组成该群落的木本植物有36种；个体高度呈金字塔增长趋势，径级结构也有类似结果；在水平分布上，上风种为集群分布，常见种则为随机分布。

The soil nutrient is detected in five shrub trees, namely Periploca sepium, Sophora davidii, Syringa pekinensis, Ostryopsis davidiana, Caragana intermedia and comparative Bothriochloa ischaemum community. We have evaluated comprehensively on soil nutrient index during the process of shrub community form and analyzed the linear correlation of soil nutrient factors.

以白羊草群落为对照，选取杠柳、狼牙刺、丁香、虎榛子和柠条5种乡土树种为研究对象，测定其土壤养分含量，计算灌木群落形成变化过程中的土壤养分指数(Soil Nutrient Index， SNI)，分析了各养分因子间的线性相关关系。

By analyzing soil quality of 4 kinds of land use types in Kalamay agriculture development area according to principal component analysis, we draw the conclusions: nature shrub tree land is affected little by mankind, a great deal of organic matter return to soil every year, and root system can improve soil physical quality, can absorb salt from soil, so the soil quality of nature shrub tree land is the best; the soil quality of farmland is better than the soil quality of manpower Tamarix Bulrush land, which may be reasoned that man make for soil quality by irrigation to exclude salt and fertilizing organic muck in the earlier oasis digging up period. Soil physical qualities of tree land get harden and worsen for flooding irrigation, furthermore climate in Kalamay is dry and rainless , the other irrigation is very long time after the former one, so soil get harden severity and result soil physical quality get worse and worse.

利用主成分分析法分析新疆克拉玛依农业开发区四种土地利用方式下的土壤质量，得出：天然灌木林地，受人为影响较小，每年有大量有机物质返还土壤，且天然灌木的根系可以很好的改良土壤的物理性质，同时所选天然灌木林灌木多是耐盐碱并且本身又具有吸收积累来自土壤的盐分，土壤质量最好；农田受到的人为影响最大，但农田综合得分却好于人工柽柳芦苇地综合得分，这可能是由于在开垦初期的绿洲农田，受到了人们灌水压盐及增施各种有机无机肥料等有利于土壤质量提高的措施所致；乔木林地，由于人们用大水漫灌的方式灌溉，致使林地土壤变得板结，土壤物理性质下降，加上克拉玛依地区气候干燥少雨，一次灌溉后较长时间后才有下一次灌溉，致使土壤理化性质恶化，土壤质量不高。

To broaden desert shrub new utilizing fields, accelerate desert shrub developing to the direction of high added-value and high benefit, the paper studied on the liquefaction of Salix, Caragana and Poplar in the presence of Phenol under sulfuric acid catalysis. The optimum processing parameters for Salix, Caragana and Poplar liquefaction and resinification were investigated. The effect of molar ratio of formaldehyde to liquefied products and NaOH to liquefied products on the character and glue strength of liquefied products resin was studied.

摘 要：为了开辟沙生灌木资源新的应用领域，促使沙生灌木资源的利用向高附加值、高效益的方向发展，本文以苯酚作液化剂，以稀硫酸作催化剂对沙柳、柠条和杨木进行液化实验，分析了反应温度、液比、催化剂用量及液化时间对液化反应的影响；并研究了沙柳、柠条和杨木液化产物树脂化合成工艺和配方，分析了不同的甲醛与液化产物摩尔比以及氢氧化钠与液化产物摩尔比对沙柳、柠条和杨木液化产物树脂的各项性能的影响。

Results showed that the activity of soil enzymes was obviously different.Among the different vegetation types,the activity of soil enzymes under Tilia mandshurica forests was the highest except peroxidase,whereas that under shrub-grass was the lowest.The activity of soil urease and alkaline phosphate under shrub was higher than that under the mixed forests.Activity of soil catalase and phosphate under Larix principis-rupprechtii forests was higher than that under Pinus tabulaeformis.

结果表明：不同植被类型的土壤酶活性有显著的区别，其中除过氧化物酶外，糠椴林的土壤酶活性均属最高水平，而灌草丛所有酶活性都属最低水平；灌木丛中脲酶和碱性磷酸酶活性显著高于杂木林；华北落叶松林的磷酸酶和过氧化氢酶活性均高于油松林。

Soil and water loss in the gullied loess hilly region in northern Shaanxi attracts worldwide attention, where soiseasonable distribution of contour shrub belt is of significant soil and water conservation effect with runoff decrease of over 30%, sediment reduction of more than 50%, and it can also increase plant coverage of 15％ to 20% on slope farmland and forms shrub network on hill slope,and change the situation of ecological environment deterioration and sparse vegetation.

摘 要］陕北黄土丘陵区的水土流失问题举世瞩目，而坡耕地的水土流失尤为严重。资料表明，配置合理的等高灌木带具有较强的保持水土效益，其径流削减率在30%以上，泥沙削减率在50%以上，可增加坡耕地植被覆盖度15%～20％，在峁坡上能很快形成林网，大大改观坡耕地长期植被稀疏、生态环境恶化状况。

However remarkable impacts were observed in the plantation in terms of community physiognomy,community structure,species composition,species richness,and biomass accumulation.1 Planting trees made community structure simple.Betula alnoidis plantation had three layers including a dominant arbor layer,a complex and well developed shrub layer and a poorly developed vine layer.The arbor layer contained few species and had a single layer.The mountain rain forest had 4 layers including the dominant arbor layer,shrub layer,grass layer and vine layer.The vine layer was well developed and very rich in species composition,and the arbor layer contained as many as 38 species that could be grouped into 3 layers.2 Sequenced by the important value,main species for the plantation and the nature forest were totally different,and the plantation had one dominant species while the nature forest contained many dominant species.3 Planting trees changed the community physiognomy.

但是人工种植西南桦林对群落的季相外貌、群落的结构、物种组成、物种丰富度以及生物量等方面有较大的影响。1人工造林使得群落结构简化，西南桦人工林的层次结构有3层，以乔木层占优势，并且有种类多而发达的灌木层，同时，藤本植物欠发达，但是乔木层树种单一，明显仅有一层；山地雨林的层次结构有4层，以乔木层占优势，还有灌木层、草本层和藤本植物，藤本植物种类多，十分发达；乔木层树种丰富，可达38种，乔木层还可分为3层。2人工造林较大程度地改变了群落的物种组成，根据重要值的大小排列，人工林和天然林的主要物种组成已经完全不同；并且人工林单优树种明显，而天然林就含有较多的优势树种。3人工造林改变了群落的外貌。

From original artificial plant community of shrub and semi-shrub to artificial-natural desert plant community with annual herb dominated.

已由原来的灌木、半灌木人工植物群落演变为一年生草本植物占优势的人工-天然荒漠植物群落。

In order to improve properties of shrub chipper and the quality of shrub chip, some factors influencing Salix end-grain cutting,such as rake angle,cutting thickness and moisture content of wood to be cutted were studied.

为了明确影响灌木材端向切削力的主要因素，改进削片机性能，提高灌木材削片质量，笔者研究了不同刀具前角、切削厚度和不同含水率对沙柳材端向切削力的影响。

The status and role of the shrub layer and main shrub species in the nutrient cycling of the mongolian oak forest were stated in this paper.

本文对次生蒙古栎林中的灌木层及主要灌木树种在林分养分生物循环中的地位与作用进行了研究。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。