Based on the investigation of four permanent plots, which are set in the mid-mountain of Darning Mountain and are in different recovery periods, the community dynamics during the vegetation restoration are studied.

本文對設立在大明山中山區(qū)處于不同恢復階段的四個固定樣地進行定位調(diào)查欧美老妇BBBBBB，主要對其植被恢復過程中群落動態(tài)學進行了研究。

Paths of wood decking and concrete unit pavers cut through the vegetation beds and allow for areas of strolling and seating along the way.

路徑木材甲板和混凝土攤鋪機的單位不卡视屏在线观看，通過削減植被病床黄色av录像，并允許領域的散步及座位在前進的道路上。

Chimonanthus, which includes 5 vegetation form, mainly grows in the evergreen defoliate broad-leaved mixed forest and evergreen broad-leaved forest.

蠟梅屬植物跨有5個植被類型欧美一级婬片人妻大片，主要生長在常綠落葉闊葉混交林和常綠闊葉林地帶国产福利在线影院。

CO2-Forced Climate and Vegetation Instability During Late Paleozoic Deglaciation - The covariance of atmospheric CO2 levels, surface temperatures, and global ice volume indicates that greenhouse gases controlled climate about 300 million years ago.

二氧化碳被迫在晚古生代氣候和植被不穩(wěn)定冰消-方差大氣二氧化碳水平，表面溫度717秋霞电影网、與全球冰量顯示控制溫室氣體氣候約三億多年ago.authors：伊莎貝爾頁montańez三级a片网址，尼爾j。

Meanwhile,in the process of ecological environment construction,the middle and high grade vegetation fraction degraded.

與此同時丰满熟妇乱又伦精品，在生態(tài)環(huán)境建設過程中亚洲免费va在线播放，原有中、高覆蓋度植被發(fā)生退化久久综合婷婷七月丁香。

This paper is based on observations of the forests of the south-eastern Tibetan plateau which were made during a six week field study carried out by the author of the forest vegetation of Zitsa Degu gZi rTsa sDe dGu; Chin.

本文基于對西藏高原東南部森林觀測操一操a片，這一持續(xù)了六周的觀測研究是本文作者在位于阿壩藏族自治州的東北的九寨溝自然保護區(qū)完成的。

The oxides of nitrogen can have deleterious effects on materials, vegetation, and animal and human life

氮的氧化物對物質(zhì)姐久久综合、植物大大一级黄色网站、動物和人類生活有毒害效應。

The process of ecological degradation in the vicinity of Shaoguan Pb/Zn smelter may be summed as: heavy metals and acidic deposits from the waste gas from smelter resulted in the vanishment of the sensitive plant species, increasing accumulation of heavy metals in soils and acidification of topsoil worsened the chemical properties and then shallow-rooted plant, mainly the herbaceous, vanished. With the demolishment of the vegetation cover, increasing water-soil erosion worsened physico-chemical properties of soil and, subsequently, some woody plants disappeared and barren land was finally appeared.

該生態(tài)系統(tǒng)的退化過程可以歸納為：來自于冶煉廢氣的重金屬和酸沉降導致了敏感植物的消亡午夜激爽免费毛片，喪失了對土壤的緩沖保護作用久久亚洲这里都是精品；重金屬在土壤表層的積累，酸性物質(zhì)在土壤表層的增加導致的土壤酸化以及由此引發(fā)的有機質(zhì)與養(yǎng)分的淋溶和重金屬及Al的活性增加国产黄片毛片视频，加劇植被的快速退化女人插插插视频，特別是淺根植物的衰亡；地被層的破壞一级毛片性爱视频网站，導致水土流失和土壤侵蝕加深日韩欧美一区二区视频，進一步惡化表層土壤的理化性質(zhì)美国超碰，一些木本植物隨之消失，最終形成光板地欧美片在线观看。

The researches cover silviculture, vegetation management, tree physiology, ecophysiology, dendrochronology, forest ecology, forest fire ecology, forest soil biology, biotechnology, forest genetics, forest entomology and pathology, forest practices effects on biodiversity and sustainability and forest economics etc.

該雜志研究領域涉及造林學激情小说狠狠爱、植被管理、樹木生理學91黄版短视频在线看、生態(tài)生理學婷婷五月一区二区三区、樹木年代學、森林生態(tài)學精品九久、森林大火生態(tài)學激情文学,图片区,视频区,偷拍、森林土壤生物學、生物技術91亚洲高清无码视频、森林遺傳學欧美人成国产综合亚洲、森林昆蟲學與病理學、森林實踐對生物多樣性與穩(wěn)定性的影響以及森立經(jīng)濟學等精品不卡一区中文字幕。

Planting, it is mainly for desert vegetation protection and desert landscape conservation.

從地圖上可以得到劃分界線的814 公頃區(qū)域規(guī)定為保護區(qū)www麻豆视频，主要用于沙漠植被和沙地保護。