Based on status space analysis and optim um theory and m ethod, this paper puts forw ard an optim um m odel for afforestation.
應用狀態(tài)空間分析和最優(yōu)化理論與方法建立了一個人工造林的最優(yōu)控制模型，給出了一個用數(shù)學規(guī)劃求解的實
Species composition, structure and species diversity of communities were studied, which was formed after (afforestation in) Tieweizhai, Bishan County.
從群落種類組成、結構特征和物種多樣性角度對重慶市璧山縣鐵圍寨馬尾松人工造林生態(tài)恢復過程中的群落進行了研究。
：9 year s afforestation of Schima superba showed that, in the belts with an elevation of more than 900 m, proper afforestation time was the middle ten days of March;in the belts with an elevation of 500～900m ,proper afforestation time was the first ten days of March;in the belts with an elevation of less than 500m, proper afforestation time was the last ten days of Febuary.
經(jīng) 9 年來對木荷人工造林的實踐：海拔 900m 以上地帶，宜在 3 月中旬造林；海拔 500～900m 地帶，宜在 3 月上旬造林；海拔 500m 以下地區(qū)，可在 2 月底造林。
Research on artificial forestation and cultural techniques to Fraxinus manshurica;
水曲柳人工造林與培育技術的研究
Proposals like closing hillside to facilitate afforestation, artificial forestation and species selection were made for regeneration of Bursaphelenchus xylophilus deseased pine forest.
針對演替類型及更新樹種存在單調貧乏的現(xiàn)狀，結合海島具體實際，提出封山育林、人工造林和樹種選擇的方向性建議，將為松村線蟲病除治跡地的更新改造提供依據(jù)。
According to the data of forest resource inventory in 1993 and 2006 respectively,the paper analyzed the original land sort and structure,forest species structure and tree species of artificial forestation in Jinghong city in recent years.
基于1993、2006年森林資源二類調查數(shù)據(jù),對景洪市近年人工造林的原土地種類及結構,林種結構、樹種結構等情況進行分析,認為目前人工林發(fā)展存在著林農(nóng)糾紛加劇,天然林不斷減少,毀林營造經(jīng)濟林現(xiàn)象突出,經(jīng)濟林種植比例過高,天然竹林的減少影響了動物食物來源,商品林比重過大導致林種、樹種及林齡結構失衡等問題。
Preliminary report on community characteristics and artificial afforestation of Delavaya toxocarpa in karst area of Guangxi
廣西巖溶地區(qū)茶條木群落特征與人工造林研究初報
Annual runoff amount of river basin is a significant basis for water resources evaluation and its allocation in reason,while the water reduction function of artificial afforestation is a foundation of estimating influences of soil and water conservation on annual runoff amount.
流域年徑流量是水資源評價與合理配置利用的重要依據(jù),而人工造林的減水作用又是估算水土保持對河川年徑流量影響的基礎。
Study on Soil Physic Characters Changes with Plantation in Datong
大通縣人工造林對土壤物理性狀影響的研究
Approach on Plantation Status in Wulan
烏蘭縣人工造林現(xiàn)狀探討
Status of Artificial Timber Forest Constriction and Its Future Development;
用材林人工造林的現(xiàn)狀及今后的發(fā)展
The artificial afforestation area is 4.388 million hectares, and the afforestation area by the plane is 911000 hectares.
其中人工造林438.8萬公頃，飛播造林91.1萬公頃。
China's Afforested Area Comes First in the World
中國人工造林面積居世界首位
Effects of Reforestation on Species Diversity and Soil Fertility;
人工造林對植物多樣性及土壤肥力的影響
Analysis on Current Situation of Artificial Forestation in Jinghong City and Existing Problems
景洪市近年人工造林狀況及存在問題分析
Study on Soil Physic Characters Changes with Plantation in Datong
大通縣人工造林對土壤物理性狀影響的研究
Survey on the Afforesting Effect of Pinus Armandi Plantation in Sichuan Huili County
四川會理縣華山松人工造林成效初步研究
Study on Approach to Selection for Reforestation Sites by ArcGIS Software
基于ArcGIS進行人工造林地塊的選擇方法研究
Effect of Adverse Climatic Conditions on Artificial Afforestation in Zhangwu Sandy Area
彰武沙區(qū)不良氣候條件對人工造林的影響
Ecological Functions and Processes in Successive Replanting Stand and Natural Regrowth Following Fallow on Clear-cutting Forestland of Chinese Fir Plantations Ecosystem;
杉木林采伐跡地人工造林與自然恢復的生態(tài)功能過程研究
The Characteristics and the Ways of Cultivated Pinus sylvestris Forest in Forest Zone of Daxingan Mountains of Inner Mongolian
內蒙古大興安嶺林區(qū)樟子松人工造林的特點與方式
Study on Forest Hydrological Effects and Optimal Afforest Models of Artificial Water Conservation Forest
人工水源涵養(yǎng)林水文效應與優(yōu)化造林研究
Evaluation on Site Quality of Plantation in Mountainous Area in Southeast of Inner Mongolia
內蒙古東南部山地人工林造林立地質量評價
A research on the Evaluation of Afforestation and Plantation Quality in East China
華東監(jiān)測區(qū)營造林與人工林質量狀況評價
Structural Characteristics of the Three Forest Plantation and the Strategies for Forest Rehabilitation
三種人工林的結構特征及林分改造對策
Note:Total area of afforestation include 100000 hectares of planted protection forests.
注：全國合計造林面積中包括軍事管理區(qū)100000公頃人工營造的防護林。
Effect of Seedling Age on Tree Growth in Yunnan Pine Juvenile Stand
苗齡差異對云南松人工幼林林木造林當年生長影響的研究
Anatomical Structure, Chemical Characteristics and Utilization of Bark of Acacia Artificial Forest
相思人工林樹皮解剖構造、化學特性與開發(fā)利用