In different phases of development, vegetation systems in this region have changed from pioneer herbage species initially recovering in abandoned cropping lands ( bothriochloa ischemum, artenmisia giradii and stipa bungeana, artenmisia sacrorum, spodiopogen sibiricus and sophora flavecens, themeda japonica, and arundinella anomala ) to secondary shrubs ( hippophae rhamnoides, sophora viciifdia, and ostryopsis davidiana ), early forest community ( populus davidiana, betula platyphylla and platycladus orientalis with arbors or shrub assembling ), and finally liaotungesis community as the mature forest. in this study, soil profiles ( 0 - 5, 5 - 15, 15 - 25, 25 - 35, 35 - 50 cm soil layers ) were selected from typical vegetation systems representing for vegetation successions in the region
該區北部目前還保存有空間上完整的植被正向演替系列,即棄耕地先鋒群落草本群落(白羊草bothriochloaischemum 、茭蒿artenmisiagiradii +長茅草stipabungeana 、鐵桿蒿artenmisiasacrorum 、大油芒spodiopogensibiricus +苦參sophoraflavecens 、黃菅草themedajaponica或野古草arundinellaanomala )灌叢群落(
沙棘hippophaerhamnoides 、狼牙刺sophoraviciifdia 、虎榛子ostryopsisdavidiana )早期森林群落(
喬灌群聚、山楊populusdavidiana 、白樺betulaplatyphylla 、側柏platycladusorientalis 、 )遼東櫟群落( quercusliaotungensis ) 。
He had been spotted by bertha jorkins of the ministry who was captured by voldemort in albania
他的部里碰上了后來在阿爾巴尼亞被伏地磨捕獲的伯
沙?
喬金斯。
By analyzing on nature, society and economy conditions as well as distribution characteristics of sand source in the lower lhasa river valley, put forward a series of comprehensive renovation scheme to harness sand sources, mainly including dredging channel, planting farmland shelter - forest network, constructing arbor - bush - herb shelter forest and shifting sand stabilization, this scheme will not only control blown - sand threat, and improve local ecological environment ; at the same time, also lay the strong foundation for enlarging lhasa city space and effectively utilizing local resource, embody a sustainable thought on how to make comprehensive renovation in high cold valley region
摘要在深入分析本區自然社會經濟條件和風
沙源分佈特徵基礎上,提出把拉薩河下遊河道疏浚與風
沙源治理相結合,以河道疏浚、農田防護林、
喬灌草防風護
沙林和流
沙固定等物理工程、生物和機械措施為主體,進行風
沙源綜合整治,一方面可有效控制風
沙災害的威脅,改善河谷區生態環境,同時為拉薩市城市空間發展和當地資源的有效利用奠定了基礎,體現了在高寒河谷區進行風
沙源綜合整治的可持續性思路。
It was a wet and windy afternoon : georgiana had fallen asleep on the sofa over the perusal of a novel ; eliza was gone to attend a saint s - day service at the new church - for in matters of religion she was a rigid formalist : no weather ever prevented the punctual discharge of what she considered her devotional duties ; fair or foul, she went to church thrice every sunday, and as often on week - days as there were prayers
一個風雨交加的下午,
喬治亞娜看著一部小說,便倒在
沙發上睡著了。伊麗莎已經去新教堂參加萬聖節儀式因為在宗教方面,她十分看重形式,風雨無阻,按時履行著心中虔誠的義務。不論天好天壞,每個星期上教堂三次,平時如有禱告要做,也一樣頻繁。
Sir george - whom, by the bye, i have forgotten to describe, - a very big, and very fresh - looking country gentleman, stands before their sofa, coffee - cup in hand, and occasionally puts in a word
還有
喬治爵士,順便說一句,我忘記描述他了。他是一位個子高大精神十足的鄉紳。這會兒手裡端著咖啡杯,站在
沙發跟前,偶爾插上一句話。
Jo lay on the sofa half - asleep when she saw a person standing in front of her
喬在
沙發上半睡半醒時,突然她看見一個人站在她面前。
Raisa gorbachev snuck away yesterday afternoon for a 65 - minute helter - skelter tour of san francisco ( san francisco chronicle
賴
沙?戈爾巴
喬夫昨天下午悄悄地溜了出去,在舊金山做了一次六十五分鐘的倉促旅行( 《舊金山年紀》 ) 。
Joe sat, poking up the sand with a stick and looking very gloomy.
喬坐著拿樹枝撥動
沙子,看上去鬱郁不樂。
Based on different regions, the drainage can be used to expand sand control belts of arbors, shrubs and grasses, to increase vegetation coverage of halosols deserts by salt - tolerant plants, or to set up protective belts of salt - tolerant plants around artificial oases
根據區域不同,利用農田排水拓展
喬灌草防
沙帶、增加鹽成土荒漠耐鹽植被的蓋度、使人工綠洲邊緣的荒漠能夠生長耐鹽植物等都是農田排水資源化利用發展的方向。
"later, " robert jordan said and his voice was thick.
「以後再說吧,」羅伯特
喬丹聲音
沙啞地說。
The president says chaudhry was removed for abuse of power
穆
沙拉夫總統說,
喬杜里因瀆職而被革職了。
Species diversity and arbor population distribution pattern of ulmus pumila l scattered grassland of horqin sand
科爾沁沙地榆樹疏林草地物種多樣性及喬木種群空間格局