forest thinning 中文意思是什麼
forest thinning
解釋
森林撫育間伐-
Mongolica young stand, secondary natural forest, and the mixed forest of larix olgensis and fraxinus mandshurica rupr. countermeasures for controlling soil degradation were also recommended. the study got following results : ( 1 ) from young stand to mid - age of larix olgensis, with the closure of canopy and the decrease of undergrowth vegetation cover, soil acidity, enzyme activity, total inorganic phosphorus, available k, soil moisture and total porosity decreased significantly ; while soil organic matter content, humus component content, the amount of three main types of microbes, acid phosphatase activity, and bulk density in rhizosphere soil and non - rhizosphere soil increased with the increase of the amount of forest floor litter ; from mid - age stand to near mature stand, with the decrease of stand density and crown cover as well as the restoration of undergrowth vegetation after preliminary thinning, soil organic matter content, fulvic acid, exchangeable acidity, exchangeable aluminium, neutral phosphatase activity, total amount of inorganic phosphorus, the amount of actinomycetes, soil moisture, and total porosity in rhizosphere soil and non - rhizosphere soil apparently increased ; from near matu re stand to mature stand, soil activity acidity, organic matter content, humus component content, available phosphorus, total amount of amino acid, available k, soil enzyme activity, soil moisture, and total porosity in rhizosphere soil and non - rhizosphere soil decreased, but total phosphorus, soil acidity ( in particular, exchangeable aluminium ), and bulk density increased
結果表明： （ 1 ）從落葉松幼齡林到中齡林，隨著林冠的郁閉和林下植被蓋度的急劇下降，林地土壤酸度、土壤酶活性、無機磷總量、速效鉀、土壤水分含量、總孔隙度呈明顯下降趨勢，而根際和非根際土壤有機質含量、腐殖質各組分含量、三大類微生物數量、酸性磷酸酶活性和土壤容重隨著凋落物的增加呈明顯上升趨勢；從中齡林到近熟林，由於撫育間伐，林分密度及郁閉度下降，林下植被蓋度逐步得到恢復，根際與非根際土壤有機質含量、富里酸、交換性酸、交換性鋁、中性磷酸酶、無機磷總量、放線菌數量、土壤水分含量、總孔隙度呈明顯的上升趨勢；從近熟林到成熟林，隨著林齡的增大，根際與非根際土壤活性酸、有機質含量、腐殖質各組分含量、有效磷含量、氨基酸總量、速效鉀、土壤酶的活性、土壤水分含量和總孔隙度呈下降趨勢，而根際與非根際土壤全磷含量、土壤酸度（特別是交換性鋁）和容重呈增加趨勢。 -
The strategy and measures to prevent the soil degradation of pinus sylvestris var. mongolica were put forward, including application of thinning rationally for existing dense plantations and establishment of mixture forest for new plantations
解決當前人工林退化的主要措施是因地制宜進行間伐或輪伐，改善林地微生態條件，盡量避免營造人工純林，建議營造混交林。 -
The study investigated the site conditions, locations, practices and costs of 45 thinning projects of forest plantations done by taiwan forest bureau in 2001
摘要本研究調查2001年林務局所進行的45件人工林疏伐計畫之地況、位置、作業方式及其成本。 -
Experimental plots were established for thinning effects on stand and tree growth, tree species composition, species diversity and soil factors etc. in the mixed larch - spruce - fir stands which originated from planted larch pure forest by observations for 12 years after thinning
摘要以15塊人工落葉松純林演化后形成的落葉松雲冷杉混交林為對象，間伐后12年觀測結果，研究間伐對林分和樹木生長、樹種組成、物種多樣性及土壤等因子的影響。 -
Logging and forest thinning are banned in natural forests protection area including community forests. non timber products utilization has been restricted in many ways
在天然森林保護區內，包括公有森林區，禁止砍伐和森林疏伐。對非木製產品的使用，已經通過多種途徑進行了限制。 -
New ideas such as eco - corridors, nesting boxes, forest thinning, habitat creation and rare plant propagation - all thoroughly tested in the 1990s - are now standard practice today
為了強化生物多樣性，郊野公園的植林已轉化為下列的生態工法： 1 .選用在植林歷史上有成效的樹種，目的為水土保持及生物多樣性。 -
The study result indicated that thinning cost was determined mainly by location of forestland, the number of thinned trees and whether or not hauling logs from forest
研究結果顯示，疏伐成本主要取決林地之地區別、是否搬出疏伐木以及搬出株數。
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