The main influence factors of forest ecosystem health in China include forest fire, acid precipitation and forest pest-disease disaster.

對森林生態(tài)系統(tǒng)健康的影響主要來自森林的各種災害，我國的森林生態(tài)系統(tǒng)健康影響因子包括生物災害、氣象災害和污染災害等日本强伦姧人妻免费无，給森林資源和森林生態(tài)系統(tǒng)的發(fā)展造成影響真人黄色网。

Forest-dwelling people," forest-dwelling on the future of science and technology have good vision and planning, from the company name "forest-dwelling" in fact can glimpse,"forest-dwelling people" in "people-oriented, development-oriented spirit, To challenge the limit, to embrace the future, and strive to become a cross-sector companies to develop and trans-regional international company.

林居人&對林居科技的未來有著美好的憧憬和規(guī)劃，從公司名稱&林居&二字就可窺見一斑欧美色图亚洲，&林居人&本著&以人為本综合sese，以發(fā)展為目標的精神，去挑戰(zhàn)極限久久精品黄大片、去迎接未來国产欧美性爱大黄片，努力把公司發(fā)展成為一個跨行業(yè)、跨地區(qū)的國際性集團公司持黄持好看视频免费。

The coverage of evergreen needle-leaved forest increased 15.2%.The coverage of deciduous needle-leaved forest, mixed leaf forest and deciduous broad-leaved forest decreased 71.7%, 32.1%, 86.7%, respectively.

常綠針葉林的面積擴大15.2%在线精品AⅤ视频一区二区，闊葉落葉林、落葉針葉林和針闊混交林的面積分別減小86.7%黄页观看在线免费，71.7%91第四色国产在线视频，32.1%。

RAPD(Random amplified polymorphic DNA) was used to detect the genetic diversity of Castanopsis eyrei populations in three forest communities at different succession stages in Tiantai mountain Zhejiang Province,namely,needle-leaved forest,needle/broad-leaved mixed forest and evergreen broad-leaved forest.

利用RAPD技術對甜櫧種群在浙江省天臺山不同演替階段森林群落(針葉林www1黄色视频免费、針闊混交林亚洲无码乱伦精品、常綠闊葉林)中的遺傳多樣性和遺傳分化進行了分析。3個甜櫧種群平均多態(tài)位點百分率為67.98%激情久久小说，總多態(tài)位點百分率為92.13%亚洲a级毛片电影。

The paper supposed five different land use scenarios, scenario1: most of the land use is forest and grass, scenarios 2: most of the land use is forest, sparsely forest and grassland, scenarios 3: the real land use of the region of interest, scenarios 4: most of the land use is range grass, sparsely forest and grassland, and scenarios 5: most of the land use is range grass.

本文假設了5種不同情景下的土地利用類型，分別設置為5種不同的情景：情景1為林地和草地為主的土地利用類型亚州欧美一级性交，情景2為林地美女一级黄色毛片在线、疏林地和草地為主的土地利用類型，情景3為研究區(qū)現(xiàn)有土地利用情況黄片一级二三级，情景4為裸巖自拍视频在线91、疏林地和草地為主的土地利用類型，情景5為裸巖為主的igao为爱寻找激情，少量草地的土地利用類型A级免费黄片，其中5種情景類型中的水域量始終保持不變。

Cunninghamia Lanceolata showed that,after Cunninghamia Lanceolata sprout forest had been changed into Schima superba and Cunninghamia Lanceolata mixing forest,tree growth had largely been increased,and the water holding and conserving ability had been upgrated,as well as,the microclimate within forest had been improved,the forest land productivity had been protected.

木荷與杉木萌芽林混交試驗gs0431.com，結果表明：杉木萌芽林改造為木荷杉木混交林后国产日韩在线亚洲色视频，林木生長量大幅度提高，林木和林地持水日韩二区、保水能力增強亚洲av线网站，林內(nèi)小氣候得到改善国产小视频你懂的在线观看百度，林分水源涵養(yǎng)能力進一步提高，林地生產(chǎn)力得到維護在线亚洲免费，為今后杉木多代萌芽林和杉木低產(chǎn)林改造提供科學依據(jù)在线精品亚洲一区二区大神。

Although forest canopy layer could prevent splash erosion effectively, clay was taken away by overland flow and run off easily, the erosion amount became less after removing the forest canopy and surface soil, while the splash erosion still produced in the surface layer; the splash function weakened after having water current, the starting particles were less than bareland, so removing the surface disturbed soil made the erosion amount and clay less, silty sand more than bareland, but unsteady, the wear and tear energy used by raindrop splash and current function for overcoming sediments separating and starting were comparatively large, sediments were very difficult to be started and transported, it explained that forest root systems could increase anti-erosion capability of forest vegetation, make rainfall-current system splash and export finer particles than bareland.

雖然林冠層能有效防止濺蝕的發(fā)生，但坡面流還是能帶走粘粒部分亚洲图片欧美小说，粘粒還是容易流失人人操人人爽黄色。去除林冠和表層土后，侵蝕量變得更少亚洲国品网站，但表層還是會被濺蝕男人女人猛烈无遮挡免费视频，有水流后，濺蝕作用減弱欧美XXXXX性交，顆粒起動的比裸地的少久久99精品久久久久久久旧本，所以，去除表層擾動土后caopeng碰公开在线视频，侵蝕量更少囯产精品免费久久久精品，粉沙多，粘粒比裸地更少一些悠色视频更新在线观看，但不穩(wěn)定免费看18禁止观看黄网站湖南，雨滴擊濺和水流作用用于克服泥沙分離起動損耗的能量較大，很難被起動輸移欧美日韩国产综合一区二区三区，這說明森林植被根系的作用增加了林地植被的抗蝕力亚洲欧洲国产精品久久久，使降雨一水流系統(tǒng)僅能濺起輸出比裸地坡面更細小的泥沙顆粒。

Many tree species at the same time and solve the spatial heterogeneity which empirical method could not achieve. Therefore, the assessment method could be applied in the selection of species for afforestation or species selection in the forest restoration areas.From collecting the attributes of planting species, spatial distribution data and environmental factors, we could integrate and analyze the data for further simulating the forest dynamics of forest in Taiwan. The impact of global change on forest also could be evaluated.

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It is shown that it is difficulty to differentiate each vegetation type among sub-tropical evergreen forest, sub-tropical coniferous forest and sub-tropical deciduous forest because of the mixture of their tree spectra. According to the reflection index in the wavelengths of 750 nm to 1 100 nm, the tree species can be divided into 4 groups with descend in reflectivity. Each tree specie can be differentiated from each other according to its slope of the spectrum curve and its reflection index in the wavelengths of 770 nm to 1 010 nm for each forest vegetation type. The unique first order derivative feature can be used to identify litsea, alder, fir, red birch, southwest birch, large schima confertiflora, taiwania flousian and small leaf schima confertiflora.

研究表明：亞熱帶常綠闊葉林免费在线性爱视频、亞熱帶針葉林和亞熱帶落葉闊葉林等植被類型，因其樹種間光譜特征混淆嚴重激情另类小说专区，而難以彼此區(qū)分国产精品2020孕妇；根據(jù)其反射率在750~1 100 nm范圍上的差異，可將其歸為4類中日欧欧A级毛片免费看；就各植被類型而言人人摸人人操人人插超碰，其樹種間在光譜曲線坡度国产黄网大全在线视频，以及在770~1 010 nm范圍上具有顯著差異，可據(jù)此將其區(qū)分人人干人人射人人草；木姜子婷婷色图区、榿木、杉木91人人妻人人做人人爽男同、紅樺国产激情综合小说、大葉木荷、禿杉和小葉木荷等因具有獨特的光譜一階導數(shù)特征国产精选视频一区，據(jù)此可以識別提取看国产一级性交电影免费在线。

The maximum rate of decomposition of soil organic carbon insubtropical wetness area is red soil under coniferous and broad-leaved mixed forest＞yellowsoil under grass＞yellow soil under shrub＞yellow soil under broad-leaved forest＞red soilunder camellia oleifera; decomposition rate of yellow soil is faster than red soil. Themaximum rate of decomposition of soil organic carbon in subtropical wetness zone isyellow-brown soil under mixed forest in Nanjing＞red soil under adult fir in Yujiang＞redsoil under broad-leaved forest in Yujiang.

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