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          2. 歡迎訪問中國歷史網!微信公眾號:

            人工造林最多國家人工造林的特點和意義是什么

            時間:2019-03-23 22:57:22編輯:梓嵐

            人工造林最多國家

            國家林業和草原局局長張建龍表示,我國人工造林11.8億畝,是全世界人工造林最多的國家。

            “‘植樹不見樹、造林難成林’的問題在個別地方存在,在不該種樹的地方種了樹,應該種灌木的地方種了喬木,沒有科學造林。另外,造了林一定要管護。”張建龍指出,這個問題要重點關注并下決心解決。

            “美國航空航天局公布了一組研究數字,說世界綠色的增加四分之一來自中國,植樹造林占42%。”張建龍表示,近年來,國土綠化取得顯著成績,最新數字在本月底前公布。我國人工造林11.8億畝,是全世界人工造林最多的國家,荒漠化防治也走在世界前列。

            人工造林最多國家人工造林的特點和意義是什么

            “當然,我們仍是一個缺林少綠的國家,生態仍然非常脆弱,需要大家共同努力,進一步提升綠化水平,實施質量提升工程,把森林質量提升起來。”張建龍說。

            人工造林簡介

            人工造林即通過人為方式在技術上要求根據林木生態適應性和生長發育規律進行科學植樹造林活動。人工造林只有把握住良種壯苗、適地適樹、及時撫育間伐、防蟲治 病等生產環節,才能達到速生豐產的目的。 在無林地上建立新林的生產過程。常作為人工造林的同義語。

            無林地系指適宜造林的荒山、荒地、采伐跡地、火燒跡地、灘涂地、沙荒地和廢礦基地等,一般統稱宜林地。造林作業包括采種、育苗、栽植(或播種)及幼林撫育等,所形成的森林稱人工林。人工林與天然林相比,其優點是:森林成熟期縮短;立木分布均勻,有利于土地、光能的充分利用;可選擇目的樹種,以滿足生產和生活的需要;可根據樹種特性和營林目的形成單層或復層森林結構;便于集約經營,保持較高的森林生產率;經營管理方便,易于機械化作業。

            人工造林五大特點

            一、所用的種子、苗木或其他繁殖材料經 過人為選擇和培育,具有良好的遺傳品質和種質,有較強的適應性。

            二、樹木個體密度適宜,在林地上分布均勻,避免了種內 競爭的消耗。

            三、可以用較少的樹木個體數量形成森林,群體結 構合理。

            人工造林最多國家人工造林的特點和意義是什么

            四、生長整齊的樹木個體有利于林木提前郁閉,并且郁閉后個體分化程度相對較少。

            五、人們可以通過多種措施調控 人工林,以提高其生產力。(陳飛) rengong zoolin 人工造林(forest plantation)在無林地上,采用人工的方法利用苗木種子或營養器官(如枝、莖稈、根等)進行造林。 而在采伐跡地或火燒跡地上采用人工種植方法恢復森林時,則稱為人工更新。人工造林是擴大森林資源、改善生態環境和緩解中國木材 供需矛盾的主要途徑之一。

            中國人工造林的意義

            中國實施了覆蓋范圍最廣的防沙治沙工程,工程覆蓋了中國八大沙漠、四大沙地。通過多年的不懈努力,使20%的荒漠化土地得到了不同程度的治理,全國土地沙化由20世紀90年代末期年均擴展3436平方公里,轉變為新世紀初年均縮減1283平方公里,實現了歷史性逆轉。中國實施了保護規模最大的天然林資源保護工程。

            工程實施以來,有效保護了15.6億畝天然林,工程區森林蓄積凈增4.6億立方米,對全國森林資源增長的貢獻率達到43%以上。此外,中國大力開展了“創綠色家園 建富裕新村”、“創建森林城市”等“身邊增綠”行動,推進了城鄉綠化。

            人工造林最多國家人工造林的特點和意義是什么

            中國發展和保護森林,增加了森林資源,固定了大量二氧化碳等溫室氣體,在減緩氣候變暖方面了發揮了巨大作用,成為全球應對氣候變化的一個亮點。1980—2005年,中國通過持續不斷地開展造林和森林經營、控制毀林,凈吸收和減少排放二氧化碳累計51.1億噸。2004年中國森林凈吸收了約5億噸二氧化碳當量,占同期全國溫室氣體排放總量的8%以上。

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