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.

結果表明：喀斯特森林木本植物群落的外貌由青岡櫟、石櫟思思热在线观看视频网站、頭狀四照花、五裂槭等中、小高位芽植物決定欧美极品A片小视频在线看，其結構一般分為喬木層、灌木層和草本層一极黄色网站，上風種有青岡櫟久久一级黄色毛片、石櫟、頭狀四照花和五裂槭www黄色网站免费观看com；組成該群落的木本植物有36種视频日韩午夜在线播放网站免费；個體高度呈金字塔增長趨勢，徑級結構也有類似結果；在水平分布上97.riav，上風種為集群分布美女a视频网站，常見種則為隨機分布。

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.

以白羊草群落為對照精品一区在线播放，選取杠柳中国老女人老妇女刺激视频、狼牙刺、丁香性感带AV电影在线免费观看、虎榛子和檸條5種鄉(xiāng)土樹種為研究對象久久久二级黄色片，測定其土壤養(yǎng)分含量，計算灌木群落形成變化過程中的土壤養(yǎng)分指數(Soil Nutrient Index在线免费91， SNI)四虎国产精品久久久久久网址，分析了各養(yǎng)分因子間的線性相關關系。

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瑪依農業(yè)開發(fā)區(qū)四種土地利用方式下的土壤質量欧美精品熟妇，得出：天然灌木林地玖玖爱在线视频播放，受人為影響較小，每年有大量有機物質返還土壤国外呦交网站，且天然灌木的根系可以很好的改良土壤的物理性質嗯啊太深了视频，同時所選天然灌木林灌木多是耐鹽堿并且本身又具有吸收積累來自土壤的鹽分，土壤質量最好久久久精品国产自在看；農田受到的人為影響最大www.99re6.com，但農田綜合得分卻好于人工檉柳蘆葦地綜合得分，這可能是由于在開墾初期的綠洲農田性交配网站，受到了人們灌水壓鹽及增施各種有機無機肥料等有利于土壤質量提高的措施所致丝袜人妻欧美；喬木林地，由于人們用大水漫灌的方式灌溉女人张开腿男人猛桶视频，致使林地土壤變得板結丁香婷婷五月天综合，土壤物理性質下降，加上克拉瑪依地區(qū)氣候干燥少雨新黄页在线观看，一次灌溉后較長時間后才有下一次灌溉毛片a片一级片，致使土壤理化性質惡化，土壤質量不高亚洲中文字幕,中文字幕在线。

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.

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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.

結果表明：不同植被類型的土壤酶活性有顯著的區(qū)別国产经是品久久久久久久久免费，其中除過氧化物酶外，糠椴林的土壤酶活性均屬最高水平欧美色综合天天综合高清网，而灌草叢所有酶活性都屬最低水平99这里还有精品；灌木叢中脲酶和堿性磷酸酶活性顯著高于雜木林；華北落葉松林的磷酸酶和過氧化氫酶活性均高于油松林黄片ah视频。

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］陜北黃土丘陵區(qū)的水土流失問題舉世矚目欧美一级人与嘼视频免费，而坡耕地的水土流失尤為嚴重。資料表明中文字幕第页日，配置合理的等高灌木帶具有較強的保持水土效益欧美精品AAAAAAAAA片，其徑流削減率在30%以上，泥沙削減率在50%以上wwwxxxx黄色，可增加坡耕地植被覆蓋度15%～20％xxxx欧美图片，在峁坡上能很快形成林網，大大改觀坡耕地長期植被稀疏国产黄色无码、生態(tài)環(huán)境惡化狀況男人的天堂欧美性爱。

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.

但是人工種植西南樺林對群落的季相外貌、群落的結構国产精品对白交换、物種組成、物種豐富度以及生物量等方面有較大的影響国产特级毛片无码专区。1人工造林使得群落結構簡化亚洲爆乳AAA无码专区，西南樺人工林的層次結構有3層，以喬木層占優(yōu)勢欧美老妇乱子BBBBBBBW，并且有種類多而發(fā)達的灌木層精品射，同時，藤本植物欠發(fā)達在线视频亚洲，但是喬木層樹種單一亚洲一级av一级无码毛片，明顯僅有一層；山地雨林的層次結構有4層欧美性色作爱视频，以喬木層占優(yōu)勢免费黄色视频醉网址，還有灌木層、草本層和藤本植物91p人妻，藤本植物種類多国内自拍AV在线，十分發(fā)達；喬木層樹種豐富，可達38種97国产精品一区在线播放，喬木層還可分為3層免费看污网站十八禁永久免费。2人工造林較大程度地改變了群落的物種組成，根據重要值的大小排列免费黄片wwwwww，人工林和天然林的主要物種組成已經完全不同野花社区wwW日本最新免费观看；并且人工林單優(yōu)樹種明顯，而天然林就含有較多的優(yōu)勢樹種激情亚洲欧美日韩在线观看网站。3人工造林改變了群落的外貌国产精品久久99囯产精品久久国。

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

已由原來的灌木、半灌木人工植物群落演變?yōu)橐荒晟荼局参镎純?yōu)勢的人工-天然荒漠植物群落国产无码精品一级片。

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.

為了明確影響灌木材端向切削力的主要因素国产一级aⅴ无码免费，改進削片機性能，提高灌木材削片質量丰满的free毛茸茸的videos，筆者研究了不同刀具前角日韩免费爱插摸视频、切削厚度和不同含水率對沙柳材端向切削力的影響。

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.

本文對次生蒙古櫟林中的灌木層及主要灌木樹種在林分養(yǎng)分生物循環(huán)中的地位與作用進行了研究囯产黄色在线视频。