But most natural forests were transformed into the artificial cultivated ecosystem—such as farmland, orchard, tea garden, economic forest, artificial forest, and others-which was result from the managing action by mankind such as disforest and reclamation, building plantation. It presented diversification of forest ecosystem conversion mode.

在歷史上视频在线看一区二区，中亞熱帶山地生態(tài)系統(tǒng)的自然植被基本上為天然常綠闊葉林超频碰97观看公开视频，但由于人類的經(jīng)營活動(如毀林開辟耕地、營造人工林等)影音先锋欧美精品，大部(來源：A85BC論文網(wǎng)www.abclunwen.com)分天然林已轉(zhuǎn)變?yōu)槿斯ぴ耘嘤猛镜纳鷳B(tài)系統(tǒng)(如農(nóng)田人人操人人莫人人vA、果園、茶園欧美快一级、經(jīng)濟(jì)林国产高清自拍一区、人工林等)，呈現(xiàn)出多樣化的森林生態(tài)系統(tǒng)轉(zhuǎn)換模式中文字幕黄色福利视频。

The domestic forest fire accidents occurs frequently, which has a devastating disserve to our society and caused a serious loss to our economy. Forest fire resulted in a lot of forest resource was burnt, the entironment and zoology balance were effected, industry and agriculture production were influenced directly, sometimes even reduced the people's life and property in a low safety situation.

國內(nèi)森林火災(zāi)事故的頻繁發(fā)生91精品啪，其破壞性危害對社會影響極大，給我國的經(jīng)濟(jì)造成了相當(dāng)嚴(yán)重的損失国产图片大全综合视频，森林資源大量燒毀一级做a爰片久久毛片A片高潮，自然環(huán)境和生態(tài)平衡受到影響，直接影響工農(nóng)業(yè)生產(chǎn)308AV.COM，甚至威脅人民的生命財產(chǎn)的安全亚洲色AⅤ性色在线观看。

ABSTRACT Global carbon cycle is a very important issue in the study of global climate change. Forest ecosystem carbon cycle is one of the important part of global carbon cycle, but at the present time there are considerable uncertainties in the research of global carbon cycle, which also exist in forest ecosystems carbon cycle research, especially in the estimation of carbon storage of region forest ecosystems and CO〓 fluxes exchanging with other systems.

全球碳循環(huán)是全球氣候變化研究的核心問題之一，森林生態(tài)系統(tǒng)碳循環(huán)是全球碳循環(huán)的重要組成部分成人黄色在线播放，目前在全球碳循環(huán)的研究中還存在很大的不確定性很污的毛片视频网址一区，這種不確定性同樣存在于森林生態(tài)系統(tǒng)碳循環(huán)的研究中，尤其表現(xiàn)在對區(qū)域森林生態(tài)系統(tǒng)碳庫大小及其與大氣CO〓交換通量的估計上九九视频这里都是精品免费线看线看。

It is applied in this paper for larch forest harvest regulation in Qianqiugou Forest Farm, Guancenshan Forest Management Bureau, Shanxi Province.

分層序列法是一種多目標(biāo)決策方法老色鬼A∨在线视频在线观看，本文將其用于山西省管涔山森林經(jīng)營局千秋溝林場落葉松經(jīng)營類型的森林收獲調(diào)整国产91精选在线看。

In plantation management, APP GXFMC reserves buffer strip, sets up firebreak, plants trees of various species and clones. Plantation forms natural mixed forest in group with nearby indigenous forests. Plantation and surrounding environment compose a perfect ecosystem together. Thereby biodiversity is improved. And forest regulation and control capacity is enhanced. Forest capacity of prevention from disease and pest is increased, too.

APP廣西林務(wù)在營林中，保留緩沖帶亚洲色一色、設(shè)置防火隔離帶做a免费视频播放网站、種植不同的樹種和不同品系的樹林，與周邊鄉(xiāng)土林成自然塊狀混交11孩岁女被A片，使人工林與周圍環(huán)境形成了一個良好的生態(tài)系統(tǒng)91pao精品永远免费网站，從而提高了生物多樣性，提高了森林的自我調(diào)控能力毛片无码免费视频一区二区三区，增強(qiáng)了森林自身抗御病蟲害的能力日韩无码超碰官网。

Engineering multi-targets and outer-benefits of conversion cropland into forest, modulation flaccidity of forest asset collocated market were analyzed in a new point, after conversion cropland into forest. Relations and focuses of different main bodies were cleared, and a result indicated that benefit maintenances and inner drive collocations of main bodies were the key of follow-up policies.

從新的視角分析了退耕還林工程運(yùn)營目標(biāo)的多元性、效益的外部性深夜十八禁、退耕還林工程后林木資產(chǎn)配置市場機(jī)制調(diào)節(jié)的軟弱性国产在线精品免费一区，理清了退耕還林工程不同主體之間的關(guān)系及關(guān)注的側(cè)重點(diǎn)，得出了培育后續(xù)產(chǎn)業(yè)維護(hù)經(jīng)營主體利益日韩精品不卡一区二区三区中文、調(diào)動經(jīng)營主體的內(nèi)在動力是后續(xù)政策關(guān)鍵的結(jié)論无码免费黄色网。

They are: fishing in the big river, Aunting on the horse in the forest, hunting on the prairie, hunting on foot in the forest Ⅰ(the main body is Yakut-Ewenki) and Hunting on foot in the forest Ⅱ(the main body is Han, Man and Koreans).

本文著重分析了"北方漁獵文化帶"，這條文化帶從大興安嶺中段開始114黄色网站，沿大興安嶺和嫩江igao激情，從西南向東北，一直延伸到大興安嶺西北坡和東北段欧美一区二欧精品视频，然后折向東南日本黄色视频在线观看免费，沿伊勒呼里山、小興安嶺和黑龍江欧洲一级A片大全，最后日本免费看A片一进一出，到黑龍江、松花江和烏蘇里江三江匯合處一级黄片久久99。

The patterns and changing of The Changbai Mountain forest ecosystem services affected by human activities were explored in this paper. The impact of human activities on Changbai Mountain forest ecosystem services include positive effects and negative effects, they were expatiated in the paper. The positive effects include protecting idioplasm resources, wildlife and natural landscape, and forest fireproofing, and so on. The negative effects contain the capacity of biodiversity, purifying environment, regulating climate, buffering disaster and supplying product etc.

摘 要：本文分析了人類活動對長白山森林生態(tài)系統(tǒng)服務(wù)功能影響的方式和利弊东北肥女人毛多水多性视频，并將其影響分為正面影響和負(fù)面影響進(jìn)行闡述，其中正面影響為生物種質(zhì)資源保護(hù)色综合视频久久、野生動植物資源保護(hù)欧洲精品欧美精品、森林防火777av视频、自然景觀保護(hù)等人人摸人人交；負(fù)面影響為生物多樣性維持能力下降、影響生態(tài)系統(tǒng)對大氣和氣候的調(diào)節(jié)過程在线免费观看视频黄片、削弱凈化環(huán)境的能力131美女作爱视频一区二区、影響水文調(diào)節(jié)能力、影響災(zāi)害緩沖能力欧美一级αA、降低生態(tài)系統(tǒng)產(chǎn)品供給能力伊人久久久AⅤ老熟妇、改變營養(yǎng)物質(zhì)的貯存和循環(huán)過程等成年色色色。

Taking the forest inventory data on forest resources investigated from June 2005 to January 2006 as the basis,the forest resource status of Guangnan county ,including the conditions of resource growth and decline were analyzed.

以2005年6月中旬至2006年1月底對廣南縣進(jìn)行森林資源調(diào)查所獲的資料為依據(jù)，論述了該縣的森林資源現(xiàn)狀se亚洲国产综合在线，并對其森林資源的消長情況作了分析影音无码资源，進(jìn)而評述了廣南縣森林資源的特點(diǎn)并作出了評價。

Among the environmental factors,temperature nearly make the same effect toall the tree species of broad leaf korean pine forest.Moisture and fertility of soil aregreatly depend on the soil type.In the broad leaf korean pine forest zone,humus darkbrown soil has the best condition of moisture and fertility,The following are typicaldark brown soil14小箩利裸体免费视频、flood and forest soil;the third is albic brown soil and meadow soil;The worst ones are skeleton brown soil and marshy soil.

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